Best Time to Mow the Lawn

The best time to mow your lawn is mid-morning between 8–10 AM or late afternoon between 4–6 PM, when dew has dried and heat stress is minimal.

Quick Summary:

• Best time of day: Mid-morning (8–10 AM) or late afternoon (4–6 PM)
• Best time of year: When grass is actively growing and reaches optimal mowing height
• Mowing frequency: Once a week during the growing season
• When to avoid: Wet grass, after fertilizing, or during extreme heat/drought

Best time to mow your lawn

So you've figured out the nutrients that your lawn needs and how much water it needs (nice!). But what about how much mowing it needs—and when? While you may think that the best time to mow your lawn is any time that it gets too long and unmanageable, that's simply not the case. There is, in fact, a best time to mow. Let's dig in.

Time of year

The best time of year to mow your lawn is when your grass is actively growing. After winter, allow your grass to recover from the frosty, cold months, and begin to grow again. The exact timing can fluctuate based on your location and the weather—which can be unpredictable year to year. A good rule of thumb: Start mowing when your grass has grown back to optimal mowing height.

Time of day

Once you do decide it's mowing day—and you lace up your lawn sneakers—aim to mow either during mid-morning (8 AM to 10 AM) or late afternoon (4 PM to 6 PM). Mid-morning allows dew from overnight to evaporate, so you're not mowing wet grass, and late afternoon avoids midday heat and increased stress on turf.

How often to mow

The rate at which your grass grows will vary, and this will be the main determining factor of how often you need to mow. Typically, during peak growth periods (spring and fall for cool season grass, midsummer for warm season), mowing once a week should be sufficient for keeping your lawn well-manicured and healthy.

When to avoid mowing your lawn

There are specific times when you shouldn't mow, as it could cause more harm than good to your lawn. Avoid mowing when:

• Wet grass: Mowing wet grass can lead to uneven cuts and mower issues—plus it can damage your lawn. Heavy traffic across the lawn while the grass or soil is wet can lead to soil compaction issues.
• After fertilizing: While you can mow and then apply nutrients, we don't recommend mowing right after applying your Sunday nutrients. For best results, wait at least two days after applying Sunday nutrients before cutting your grass to ensure nutrients are absorbed properly.
• Extreme heat or drought: Don't mow when your grass shows signs of dormancy (brown or wilted blades). During these times, your turf is stressed, and mowing can cause excess damage. Fun fact: That freshly mown grass smell we all love is actually a distress signal! So mow with care.

When to stop mowing for the year

This is refreshingly simple: Stop mowing when the grass stops growing. How do you figure this out? You'll notice fewer clippings leftover after you mow. It may be obvious that grass isn't increasing in height any longer, and for some grass types, it may lose its deep green color.

Bonus lawn mowing tips

We've covered the whens, so let's touch on some hows. Keep these rules and best practices in mind as you're mowing.

1. Take a break after applying Sunday. In general, Sunday nutrients will offer best results if they're applied to grass that isn't stressed—aka, freshly mowed. Our rule of thumb is to mow first, wait at least two days, and then apply your nutrients to your lawn, and wait at least two more days before mowing again. This allows the grass to recover from mowing stress and will result in better absorption.
2. Maintain your mower. It's important to maintain your mower throughout the season to make sure it's working hard for you. Before you rev up the mower for the season, sharpen your mower blades to avoid tearing and damaging the grass. This is important because shredded or torn grass blades can lead to disease susceptibility, or your grass drying out and requiring more supplemental watering.
3. Don't cut your grass too short. As a good rule of thumb, avoid cutting more than ⅓ of the leaf blade at a single time, as that can damage the grass plant. Mowing high helps deter weeds, increase photosynthetic ability (more blade surface), and promote deeper rooting.
4. Grasscycle. If you're not already grasscycling, now's the time to try. Grasscycling is simply leaving your grass clippings on the lawn after mowing, and letting them work their magic. Not only is grasscycling the most sustainable way to compost your clippings, it's also a way to add free nutrients back to your lawn.
5. Protect flowering clover and pollinators. If you're growing a clover lawn, raise the mowing height a touch if possible, and only mow early morning or late evening to avoid heavy bee traffic. This will help you avoid conflict with foraging bees in your clover lawn.
6. Mow less in May. Consider mowing your lawn less (but don't fully stop) during the earliest parts of spring. Early foraging pollinators need flowering plants and your grass can offer a flowering plant habitat, if you let it. Mowing every two weeks actually helps your grass, while helping our local ecosystems too.
7. Upgrade your tools. One easy way to reduce emissions is by getting better tools. Consider switching to an electric mower for a healthier, greener (in color and in eco-friendliness) lawn.

Does mowing matter, anyway?

Short answer: yes. Long answer: absolutely yes. Proper technique—including everything we discussed above—benefits your grass in many ways, including the following:

Deeper rooting

Mowing not only helps to keep your grass at a manageable length, but also encourages deeper underground rooting, which leads to stronger, healthier grass.

Lateral growth

Turfgrass in nature evolved from wildlife and livestock grazing. Meaning when animals grazed on turfgrass, it eventually evolved to spread laterally on the ground. Since your lawn (hopefully) isn't being grazed upon, mowing acts almost as an artificial means of this, so when you mow, you encourage the grass to spread laterally across your lawn—leading to denser, thicker grass.

Fewer weeds

A lawn with deep roots and lateral growth will, in turn, have fewer weeds. When you have deeper roots and greater turfgrass canopy, you have fewer pockets for weeds to germinate or grow in across your lawn.

Added nutrition

In addition to making your lawn look better, proper mowing can actually create a more nutrient-dense lawn. When you mow and leave your grass clippings, you're adding available (and free!) nutrients to your lawn. Meaning, again, healthier grass.

What is the best time of day to mow grass? The best time to mow is mid-morning (8–10 AM) after dew has dried, or late afternoon (4–6 PM) to avoid midday heat stress on your lawn.

How long should I wait to mow after fertilizing? Wait at least two days after applying fertilizer before mowing to ensure nutrients are properly absorbed by your lawn.

How often should I mow my lawn? During the growing season, mowing once a week is typically sufficient to keep your lawn healthy and well-manicured.

Is it bad to mow in extreme heat? Yes, avoid mowing when temperatures are above 90°F or during drought conditions, as your grass is already stressed and mowing can cause additional damage.

Cited sources

Mowing practices for healthy lawns. UMN Extension.