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A good-looking lawn comes down to three things: mowing often enough, at the right height for your grass, with a sharp blade. This guide covers each one. If you’d rather not do it yourself, you can have a local crew take over the mowing.
01 / When to mow
- How often should you mow your lawn? Weekly, every two weeks, and the one-third rule.
- What’s the best time of day to mow? Why mid-morning beats noon and dusk.
- Can you mow wet grass? What happens if you mow after rain.
- What time is too early (or late) to mow? Noise rules and neighbor etiquette.
- Is mowing every two weeks enough? When biweekly works and when it doesn’t.
- How long does it take to mow a lawn? Time by yard size and mower.
- Should you mow in winter? Dormant lawns and the occasional winter cut.
- Can you mow after a frost? Why to wait until it thaws.
Tired of mowing?
A local pro can mow weekly or every two weeks, at the right height for your grass.
02 / How to mow
- How to mow a lawn the right way Height, pattern, blade and clippings.
- Mowing height by grass type The full height chart for every common lawn grass.
- Edge before or after mowing? The order that gives the cleanest finish.
- How to mow tall, overgrown grass Bring a yard back without scalping it.
- How to mow lawn stripes and patterns Stripes, checkerboards and diagonals.
03 / Related guides
Lawn looking worse after a cut? Start with lawn problems after mowing. Planning the year? See the lawn year. Wondering what a crew charges? See lawn mowing cost and hiring.
Mowing works best alongside the rest of your lawn routine. See mowing, watering and feeding: how they fit together and mowing and weeds: timing your weed control.
04 / The rules every good mow follows
Whatever grass you have and whatever mower you use, the same handful of habits separate a clean cut from a ragged one. These come from Oklahoma State University Extension’s lawn management guidance.
- Take a third at most. OSU recommends mowing so that no more than about one-third of the leaf area comes off at once. Its example: cut U-3 bermudagrass at 1 inch each time it reaches 1.5 inches. That rule is what sets how often you need to mow.
- Keep the blade sharp. According to OSU, dull or badly adjusted mowers bruise the leaf tips, reduce growth and leave the lawn with a dull cast from frayed blades.
- Vary the pattern. Changing direction from one mow to the next spreads wear and reduces soil compaction. It is also the starting point for mowing stripes and patterns.
- Turn on hard surfaces. Make your turns on the sidewalk or driveway, or make wide turns, so the wheels don’t grind the same patch of turf.
- Skip wet grass. OSU notes that wet grass is harder to cut well, the clippings clump, and disease spreads more easily. More on mowing after rain.
- Leave the clippings. Bagging removes nutrients, uses landfill space and takes more time than mulch mowing, according to OSU. See whether to bag or leave grass clippings.
None of these rules is hard on its own. Sticking to all six every week, through spring growth and summer heat, is the part most people find tough. If that’s you, book a nearby mowing crew on a set schedule and let them keep the blade sharp.
05 / Mowing height at a glance
Height is the setting that matters most. Oklahoma State University Extension lists these heights for the common cool-season grasses, with tall fescue raised in summer:
| Cool-season grass | OSU recommended height |
|---|---|
| Kentucky bluegrass | 2.5 in |
| Perennial ryegrass | 2.5 in |
| Tall fescue | 3.0 in (May–Aug); 2.5 in (Sep–Apr) |
Knowing whether your grass is warm-season or cool-season, and how it spreads, tells you a lot about how to mow it. Each grass below links to its own height page.
| Grass | Season | Growth habit |
|---|---|---|
| Tall fescue | Cool | Bunch-type |
| Kentucky bluegrass | Cool | Spreads by rhizomes |
| Bermudagrass | Warm | Stolons and rhizomes |
| Zoysiagrass | Warm | Stolons and rhizomes |
| St. Augustinegrass | Warm | Stolons |
| Centipedegrass | Warm | Stolons |
OSU adds a few adjustments: keep grass in shade at a slightly higher cut, and cut warm-season grasses higher in fall to insulate them against cold. For the full chart, including warm-season ranges, see mowing height for every common lawn grass.
06 / How long the mowing season lasts where you live
The number of weeks you’ll be mowing depends on your climate. NOAA’s 1991–2020 U.S. Climate Normals give the median length of the 32°F-free season for each city, which is a fair guide to how long the grass keeps growing.
| City | Last spring 32°F | First fall 32°F | Frost-free days |
|---|---|---|---|
| Denver, CO | May 5 | Oct 9 | 156 |
| Chicago, IL | Apr 16 | Oct 28 | 193 |
| Boston, MA | Apr 4 | Nov 9 | 218 |
| Atlanta, GA | Mar 15 | Nov 20 | 252 |
| Dallas–Fort Worth, TX | Mar 8 | Nov 24 | 262 |
In a typical year (median), a Dallas–Fort Worth lawn gets about 106 more frost-free days than one in Denver. Frost dates are a guide to the ends of the season, not a trigger: start when the grass is growing and stop when it isn’t. For all 10 cities and a month-by-month plan, see the seasonal mowing calendar.
Frequently asked questions
How much grass should I cut off at once?
No more than about one-third of the leaf. Oklahoma State University Extension gives the example of cutting U-3 bermudagrass at 1 inch each time it reaches 1.5 inches.
How high should I mow cool-season grass?
OSU recommends 2.5 inches for Kentucky bluegrass and perennial ryegrass, and 3.0 inches for tall fescue from May through August, dropping to 2.5 inches from September through April.
Should I bag or leave grass clippings?
Leave them. According to OSU, bagging removes nutrients, uses landfill space and takes more time than mulch mowing.
Why does my lawn look dull after mowing?
A dull or badly adjusted blade is a common cause. OSU notes that it bruises the leaf tips, reduces growth and leaves a dull cast from frayed blades. Sharpen or replace the blade.
Is it OK to mow wet grass?
It’s best to wait. Wet grass is harder to cut cleanly, the clippings clump, and disease spreads more easily, according to OSU.
Sources: Oklahoma State University Extension, HLA-6420; NOAA U.S. Climate Normals (1991–2020); NC State Extension Gardener Handbook; Penn State Plant Science.