Blogs | Lawn Garden

A light rain shower or morning dew won't cause any problems. The real concern comes from standing water or leaving a mower out in the rain overnight, which can allow moisture to get into parts that shouldn't be wet. Gas engines and electric motors don't handle sitting in water very well. However, robot lawn mowers are built for outdoor use and can handle rain much better than traditional push mowers. What Happens When a Gas Lawn Mower Gets Wet? Water causes the most damage on a gas mower when it reaches the inner parts, such as the fuel tank, air filter, or spark plug. A few drops on the deck or handle don't pose a problem. But if rain gets into the gas tank, it can dilute the fuel and cause the engine to sputter or refuse to start. Water in the air filter blocks airflow the same way a clogged filter would, while a wet spark plug cannot fire properly, so the mower cranks without catching. None of this is dangerous or permanent if you dry everything out and check the engine before starting it again. These issues encompass most of what happens if a lawn mower gets wet on the gas side. What Happens When an Electric Lawn Mower Gets Wet? When an electric lawn mower is left out in the rain and gets wet, the risk lies in the battery contacts and wiring. Most electric mowers are sealed well enough to handle a rain shower while mowing. But leaving one out in the rain for an extended period increases the possibility of water sitting on exposed contacts, which leads to corrosion over time. A soaked wiring harness raises the odds of an electrical fault. If your electric lawn mower got properly soaked, you can fix it by drying and inspecting it instead of replacing it. Both lawn mower types have their risks, but our electric vs gas lawn mower comparison tells you how the two hold up outdoors overall. Dreame Take: A mower that requires constant monitoring for weather isn't truly automated. This is why Dreame incorporates weather sensing and water resistance, allowing the mower to operate safely and independently based on the schedule you've set. Can You Leave a Lawn Mower Outside in the Rain? It is best to avoid leaving a lawn mower outside in the rain whenever you can, though the risk depends largely on how long it sits outside. A mower caught in a quick afternoon shower and brought in soon after is usually fine once it dries. A mower left outside overnight in the rain or sitting in standing water after a storm faces a much higher chance of rust on metal parts and moisture creeping in. Can a lawn mower get rained on occasionally without consequence? Yes, mostly. It only becomes a problem with repeated or prolonged exposure, not one wet afternoon. Important: A mower that sits in standing water or gets soaked overnight is far more at risk than one caught in a short shower. What to Do if Your Lawn Mower Gets Wet What to do if your lawn mower gets wet depends on what you do now and what you should check before using it again. Skipping either step may turn it into a bigger repair issue. Right now Cut the power first by disconnecting the spark plug on a gas mower or removing the battery on an electric one. Wipe off any visible water and set the mower somewhere warm and ventilated to dry, ideally with the underside exposed to air. Resist the urge to start it right away, as letting it dry fully lowers the odds of a short or a rough start. Before you restart Once the mower dries, check the oil on a gas engine for any milky discoloration, which indicates water got into the crankcase. Clean or replace a damp air filter, and dry the spark plug before reinstalling it. On an electric mower, inspect the battery contacts for corrosion and make sure the housing is fully dry before reconnecting power. If everything looks clean and dry, the mower is usually fine to run again. Pro-tip: Give a soaked mower a full day to dry in a warm, ventilated spot before trying to start it. Consider A Robot Mower When Getting Wet Is a Concern If you're tired of running outside to bring in the mower every time rain clouds roll in, or of leaving it out and hoping for the best, there's another option to explore. A robot lawn mower can manage bad weather itself instead of waiting for you to bring it in. The Dreame A3 AWD Series handles this two ways. IPX6 water resistance covers the body and chassis, so getting rained on does not damage anything. You can also wash it off directly rather than wiping it down by hand. Set a cleaning point in the Dreamehome app and the mower parks itself there for the rinse. Smart Weather Sensing detects rain, snow, and frost. The mower returns to the charging station and picks up where it left off once the weather clears, so you never have to move it and you don't need to reschedule. [product handle="a3-awd-robot-lawn-mower"] See whether robot lawn mowers are worth it for a lawn like yours. Curious as to how a robot lawn mower handles a larger yard? Our robot lawn mower buying guide walks through matching coverage to lawn size so you can pick the right one for your yard. Can a Lawn Mower Get Wet? Yes, water is manageable if you catch it early. Simply cut the power, dry the mower fully, then check the important parts before starting it again. Robot lawn mowers are built to handle rain on their own so you can stop thinking about weather altogether. Browse Dreame robot lawn mowers to see which models fit your yard. Frequently Asked Questions Can a lawn mower stay outside in the rain? It is best avoided. A short shower is survivable, but a mower that sits in the rain for hours or overnight risks rust and moisture damage. Is it bad for a lawn mower to get rained on? A light rain is usually fine if the mower is dried soon after. Prolonged exposure is what causes the damage. What happens if you leave an electric lawn mower in the rain? You risk corroded battery contacts and electrical faults. Dry the mower fully and check the contacts before using it again. Can rain ruin a lawn mower? Rain can ruin a lawn mower if it reaches the fuel, engine, or electrical components and sits there. Quick drying and a check before restarting usually prevent lasting damage. Are robot lawn mowers waterproof? Many are water-resistant and built to stay outside. The Dreame A3 AWD Series has Smart Weather Sensing and carries an IPX6 rating. The A3 AWD Pro Series is also IPX6-rated.

When your lawn looks ragged after a mow and the grass tips turn brown a day later even though you watered on schedule, it's time to check your lawn mower blades. A dull blade tears grass instead of slicing it, and torn tips die back faster, leaving a whitish, shredded look often mistaken as heat or disease. Learning how to sharpen a lawn mower blade takes under an hour with a wrench and file, which most garages already have. Below are the steps, frequency, and angle to sharpen your lawn mower blade, plus whether you still need to do all three after switching to a robot lawn mower. How Do You Know When a Blade Needs Sharpening? You will know a blade needs sharpening when you see what remains after a mow. Torn or frayed grass tips, rather than clean cuts, are the biggest indicator. Virginia Cooperative Extension turf specialists note that mowing with a dull blade is one of the fastest ways to give a lawn a ragged, brownish look, since torn tissue dies back faster than a clean slice does. An uneven cut, with some patches shorter than others, points to a dull or nicked blade. Another clue is when the mower strains or bogs down in grass it used to handle fine. To find the problem, first disconnect the spark plug or remove the battery and flip the mower over. Check the edge directly for visible nicks or a rounded edge. Any of these indicate that it's time to sharpen the blades. How Often Should You Sharpen Mower Blades? Sharpen mower blades every 20 to 25 hours of mowing time. For a typical weekly mow through a 20- to 26-week season, that works out to once or twice a year, with a second pass in mid-summer with heavier use. These other factors can also cause blades to dull more quickly: Large lawns that take longer per session. Thick or coarse grass types. Sandy soil that carries more grit into the cut. Any contact with rocks or roots. The easiest way to track this without a logbook is to watch the grass. If clippings start looking torn instead of trimmed, sharpen regardless of how many hours you've logged. Pro-tip: Keep a spare blade on hand. Swap in the sharp blade to keep mowing on schedule while you sharpen the first one at your own pace. What You'll Need You only need a handful of tools to sharpen a lawn mower blade, most of which you can find at your local hardware store. Prioritize safety gear such as thick work gloves and eye protection, as even a dull blade can cut you. A socket wrench, plus a block of wood to jam the blade so it won't spin while you loosen the bolt. A vise or clamp to hold the blade steady. A metal file, a drill-mounted sharpener, or an angle grinder. A blade balancer. Alternatively, a large nail through the center hole also works in a pinch. The same tool list applies regardless of whether you're considering an electric vs. gas lawn mower purchase. The sharpening steps below will also not change based on your lawn mower type. How to Sharpen a Lawn Mower Blade, Step by Step This guide is a step-by-step process for sharpening a lawn mower blade, from disconnecting the mower to reinstalling a sharp, balanced edge. Work through these seven steps in order, and don't skip the balance check, since an unbalanced blade causes vibration that wears out the spindle over time. 1. Disconnect the power Disconnect the spark plug wire on a gas mower, or remove the battery on an electric one. This is non-negotiable, as the blade should not be able to turn while your hands are anywhere near it. 2. Drain fuel and tip the mower For a gas mower, run the tank low or drain it, then tip the mower on its side with the air filter and carburetor facing up so oil and fuel don't flood the wrong way. An electric mower can simply be tipped once the battery is removed. 3. Remove the blade Mark the underside of the blade with a permanent marker so you know which way it was installed. Then, use a socket wrench with a block of wood wedged against the deck to break the center bolt loose and lift the blade free. 4. Clean and inspect Scrape off caked grass and dirt, then check for cracks, deep gouges, or a visible bend. Replace the blade instead of sharpening it if you find any of these. A cracked blade spinning at full speed is a major safety risk. Damage aside, blades wear down on a schedule you can plan around. Here is how often to replace mower blades under normal use. 5. Sharpen along the factory angle Clamp the blade in a vise and file or grind along the existing bevel in one direction, from tip to base. Cover the full length of the cutting edge on both ends evenly, and stop once you've restored a clean edge. 6. Check the balance Set the blade on a balancer, or slide a large nail through the center hole and let it hang. If one side dips, take a little more metal off that end until the blade sits level. 7. Reinstall Set the blade back in its original orientation using the mark from step 3, and tighten the center bolt to the torque that the mower's manual lists. Reconnect the spark plug wire or battery, then run the mower briefly on a flat patch to check for vibration or noise before mowing the full yard. What Sharpening Angle Should You Use? The right lawn mower blade sharpening angle is the same as the bevel the factory already cut into the blade, typically between 30 and 45 degrees. Rather than measuring and picking a new angle, look at the existing bevel and match it as you file or grind. If you go shallower, you'll create a finer edge that chips and dulls faster, while going steeper creates a more durable edge that doesn't cut as cleanly. Neither is correct, since the factory angle is already a balance of sharpness and durability for that specific blade. A simple angle gauge or bevel protractor helps if you want to double-check, but eyeballing the existing bevel and holding it steady is usually enough. Can You Sharpen a Blade Without Removing It? Yes, you can sharpen a lawn mower blade without removing it, but the results are usually worse. Filing the edge while it's still bolted to the deck is fast and fine as a quick touch-up between full sharpenings. However, it's harder to hold a consistent angle with the blade wedged under the deck, and you can't check the balance without removing it. If the blade is only mildly dull, an on-mower touch-up buys you a few more mows. If it's torn up or nicked, remove it and do the job properly. Important: Even for a quick on-mower touch-up, disconnect the spark plug wire or remove the battery first. The blade should never be able to turn while your hands are near it. Do Robot Mower Blades Need Sharpening? No, robot mower blades do not need sharpening as they simply get swapped out. Most robot lawn mowers, including the A3 AWD Pro Series, use small individual cutting blades mounted on a disc rather than a single long blade you pull and file. Replacing a dull or nicked blade takes a few minutes with a screwdriver rather than the routine above. The A3 AWD Pro Series uses a 15.8" Dual Blades setup, so you replace one small blade at a time instead of one large disc. While sharpening is cheaper over the life of a single blade, swapping is faster and skips the tools and steps above entirely. For anyone who's already set on a robot mower, this option is one less chore to think about. But if you're still weighing your options on making the switch, our guide on whether robot lawn mowers are worth it covers the decision in more depth. Dreame Take: Yard technology should simplify chores instead of creating new ones. This belief shapes the A3 AWD Pro Series, designed with individual cutting blades that can be replaced in minutes, ensuring mower maintenance doesn't turn into a weekend job. A Sharp Blade Is a Simple Habit To keep a lawn mower blade sharp, watch for torn grass tips and a brownish cast post-mow, sharpen the blade every 20 to 25 hours along whatever bevel the factory has already cut, and always check the balance before reinstalling. If keeping a blade sharp isn't how you want to spend your Saturday, Dreame robot lawn mowers allow you to skip the whole routine. All you need is a quick blade swap every so often. Our robot lawn mower buying guide walks through the specifics to help you choose the right model before you buy. Frequently Asked Questions Are lawn mower blades worth sharpening? Yes. Sharpening costs less than replacing a blade and gives you a cleaner cut with less strain on the mower, so it pays for itself within a season or two. Can you sharpen mower blades without removing them? You can, but it's harder to hold a consistent angle, and you can't check balance afterward. Removing the blade gives a cleaner edge overall. Can you sharpen a lawn mower blade with a hand file? Yes. A file is slower than a grinder but easier to control for a first attempt. Work in one direction along the factory angle and keep the stroke count even on both ends. Do you sharpen both edges of a lawn mower blade? Yes. Most rotary blades cut on both ends, so sharpen both cutting edges and keep the material removed even on each side to protect the balance. How much does it cost to have blades sharpened? Shops typically charge a per-blade fee that varies by region. Sharpening at home costs next to nothing beyond the tools, which pay for themselves after a sharpening session or two.

Replace your mower blades about once a year, or every 25 hours of cutting, whichever comes first. Leave it longer and your grass tips tear instead of cutting clean, going ragged and brown after a mow. It's not good for the mower either, since a dull blade makes the motor work harder and drags out the job. Working out how often to replace mower blades is really just working out which of those two numbers applies to you, and the rest of this guide covers that, plus how to tell when a blade is done, when to sharpen instead of replace, the blade types, and how robot mowers work differently. Which Number Applies to Your Lawn The two numbers above suit different lawns, so how often to change lawn mower blades really depends on how much you mow. The calendar figure, about once a year, fits a normal suburban lawn mown weekly. Fit a fresh blade at the first mow of spring, and you are unlikely to need another before next year. The hours figure, every 25 hours of cutting, fits larger properties where you are out twice a week dealing with peak growth or crossing rough ground that wears the edge down fast. Those blades reach 25 hours of use well before the season ends, so on a bigger lawn that is the figure to track rather than the calendar. How Long Do Lawn Mower Blades Last? A steel mower blade lasts anywhere from a single season to two, and it depends almost entirely on what you are mowing. Sandy soil and buried stones do more damage in one pass than a month of clean cutting, and wet grass dulls an edge faster than dry, so a rough or overgrown lot wears a blade out much faster than a small tidy one. The hour figures you find online measure two different things. If you see 25 hours, that is counting sharpening intervals, the point where a blade stops cutting cleanly and needs an edge put back on. If you see 100 to 200 hours, that is counting the total working life of the steel before it is too thin to sharpen again. Bigger lawns are the ones that rack up hours fast, since more ground per mow means more cutting time on the same blade. If that sounds like your backyard, our robot mower for large lawns guide walks through the models built for that kind of coverage and how they handle a heavier workload. The table below shows roughly how long a blade lasts by how hard the lawn works it. These are typical home-lawn ranges, not manufacturer figures. Use pattern Rough blade life Replace about Small flat yard, mown occasionally Up to two years Every other season Average home yard, weekly in season Around one year, or 25 hours of cutting Once a season Large or rough lot, debris, frequent use Well under a year Mid-season, watch the signs Signs It Is Time for a New Blade The main sign is how your grass looks after a mow. A sharp blade slices each leaf cleanly, so the lawn looks even and recovers fast. A dull one tears, leaving a frayed brown tip that gives the whole lawn a washed-out look. Learning when to replace lawn mower blades is really about being able to spot that tear. Aside from the grass, here are other signs to watch for. Pale or frayed grass tips a day after mowing, rather than clean flat cuts An uneven finish, with strips the mower seems to have missed Visible dents, bends, or gouges along the cutting edge A blade that will not hold an edge after being sharpened twice Extra vibration through the handle, or a rougher note under load Mowing taking noticeably longer than it did last month Should You Sharpen or Replace the Blade? Figuring out if you need to sharpen or replace mower blades depends on whether the blade is just dull or is actually damaged. Light wear means a rounded edge with no chunks of metal missing, and that kind of blade can be sharpened in minutes. Damage means something structural has changed, like a bend, a crack, or steel worn thin enough that the wing has lost its shape, which isn't something a file can fix. Not sure how to tell? Run a gloved hand along the flat of the cutting edge. A sharp one catches slightly, like the back of a butter knife, while a dull one feels smooth and rounded. Don't rely on how shiny it is, since a blade can look bright and still cut badly. Another one to watch for is a blade you have already sharpened twice that still leaves a rough finish on your grass. At that point it's time to replace it rather than try again. A good habit is to sharpen at least twice a year, which Purdue's turf scientists recommend, and a blade you sharpen on that schedule tends to wear out around the same time you would be replacing it anyway. Important: If you are checking the edge with a gloved hand, disconnect the power first. Pull the spark plug wire on a gas mower, or take the battery out of an electric one, before you touch the blade. The same goes before swapping blades on a robot mower. Types of Lawn Mower Blades and What Each One Does There are several kinds of mower blade, all made for different jobs. The table below shows the main types and what each one is best for. Blade type What it does Best suited to Standard, also called 2-in-1 Cuts, then either bags the clippings or shoots them out the side Everyday mowing on mixed setups Mulching, also called 3-in-1 A curved edge holds clippings under the deck and recuts them fine Returning clippings to the lawn High-lift Stronger airflow pulls grass upright before the cut Collecting clippings in the bag, and taller grass Low-lift Less airflow, so it throws up less dust Dry or sandy ground, shorter cuts Serrated mulching Teeth shred the clippings finer for mulching Thick or leafy growth Reel, on a manual mower A spinning cylinder of blades cuts against a fixed bar, like scissors Small flat lawns and fine turf Robot mower Small pivoting blades that swing back on impact Frequent light trimming To see which one you have, tip the mower on its side with the air filter and carburetor facing up, so no oil or fuel leaks into them, and look at the blade. A mulching blade has a pronounced curve along its length and more cutting surface than you expect. A high-lift has a steep upward wing at each end, while a low-lift looks flatter and plainer beside it. Upkeep changes with the blade too. A mulching blade carries more edge and does more work per pass, so it dulls sooner than a standard blade on the same lawn. A serrated blade is hard to sharpen evenly, so most owners swap it instead. If you have a robot lawn mower Robot mowers work differently. Instead of one large steel blade, they spin a disc fitted with several small blades that swing back rather than resist when they hit something solid. There is nothing to sharpen. You unclip the worn set, clip on a fresh one, and the whole job takes a couple of minutes with no tools. The trade-off is how often. Small thin blades wear faster, so plan on a fresh set every 6 to 8 weeks through the mowing season, and sooner if you have been running over debris. On the Dreame A3 AWD Series, for instance, the quick-detach blade set comes off by hand. Deck setups vary across the range. The A3 AWD Pro Series runs 40 cm dual blades for double the cutting efficiency, while the standard A3 AWD Series uses a single 20 cm blade for everyday lawns. The blades swap out the same way on both. Dreame Take: Dreame's view is that maintenance guidance should be specific enough to act on. Rather than leaving blade timing to guesswork, the A3 AWD manual gives a clear replacement window, so upkeep stays a short scheduled task instead of something you only notice once the cut starts looking rough. [product handle="a3-awd-robot-lawn-mower" slogan="Compact Yard Pick"] How to Get More Life Out of Your Blades There are a few things you can do to lengthen the lifespan of your blades, and they're easy enough to repeat until they become a habit. Clear the lawn first. A thirty-second walk to pick up stones and dog toys stops the blade from hitting something that's going to wreck the edge. Mow dry. Wet grass clumps under the deck and dulls the edge faster than dry cutting. Keep the deck clean. Caked clippings hold moisture against the steel and unbalance the blade over time. Do not cut too low. Setting the deck so low the blade grazes soil is the fastest way to ruin an edge. Sharpen on a schedule. A blade kept sharp wears evenly and reaches its full working life. If you would rather skip the weekly mowing altogether, a robot mower handles the cutting on its own, with blades that take minutes to swap when they wear out. Our robot lawn mower buying guide walks through yard size, slope, and the features worth paying for, so you can match a model to your lawn. What to Remember About Replacing Mower Blades For a steel blade, once a year or every 25 hours of cutting is the baseline, but how your grass looks after a mow is also a good way to tell. Ragged, torn tips are a sign that it might be time to sharpen or replace. A few small habits like clearing the lawn first and mowing only when the grass is dry can stretch the lifespan of your blades. Robot mowers take most of that off your hands. You swap in a fresh set of blades every 6 to 8 weeks, and there is nothing to sharpen. If mowing has become too much of a chore, consider browsing our collection of robot lawn mowers to find a model that takes it off your hands. Or if you would rather see the models compared before you decide, this list of Dreame's best robot lawn mowers sorts the picks by yard size and terrain, from small flat lots to hilly half-acres. Frequently Asked Questions How do I know when my lawn mower blade needs replacing? Look for torn or ragged grass tips, visible dents or bends in the edge, or a blade that will not hold an edge after sharpening. Knowing when to replace lawn mower blades really comes down to spotting any one of those. Is it better to sharpen or replace a mower blade? Sharpen it if it is just a little dull. Replace it once the blade is damaged, thinned, or has been sharpened a few times and still cuts poorly. How long should a set of mower blades last? About a year for most home lawns, or roughly 25 hours of cutting. Heavy use and the odd hidden stone or root will cut that shorter. How often should you replace robot mower blades? Every 6 to 8 weeks during the mowing season, or sooner if the mower has been running over debris. They are small quick-swap parts, so you replace them rather than sharpen them. Can you sharpen robot mower blades? Generally no. They are designed to be replaced as a set, and swapping them takes minutes without tools. What happens if you mow with a dull blade? It tears the grass instead of cutting it cleanly, so the tips turn brown and the lawn looks patchy. The motor also works harder, so mowing takes longer. References Patton, A. (2012). Don't forget to sharpen those mower blades. Turfgrass Science at Purdue University. https://turf.purdue.edu/dont-forget-to-sharpen-those-mower-blades