| Key takeaways |
|---|
| • Aim for 2 to 2.5 inches: Cut most lawns to this height for the final mow, low enough to discourage snow mold and pests, tall enough to protect the crown. • Adjust by grass type: Trim cool-season grass about a half-inch shorter than usual and warm-season grass a half-inch taller. • Stop when growth stops: Keep mowing until air temps stay below about 55 degrees or the first frost hits, and never scalp the lawn on the last cut. |
Cut the grass 2 to 2.5 inches tall before winter to protect it from snow mold and cold stress. For most lawns, that means trimming cool-season grasses about a half-inch shorter than usual and warm-season grasses a half-inch taller.
Below, we cover shorter versus taller, the best last-mow height by grass type, when to stop mowing for the year, and a few common questions.
If your fall weekends are already full, a local Lawn Love pro can handle the last cuts and get your lawn ready for winter with a final lawn mowing.
Should you cut the grass shorter or taller before winter?
The exact ideal cutting height before winter is about 2 to 2.5 inches for most lawns. Cut to this range for the final mow, then adjust by type: cut cool-season grass a half-inch shorter and warm-season grass a half-inch taller.
Cool-season lawns tolerate a slightly lower cut, while warm-season lawns need extra height for insulation against winterkill.
Why the right mowing height matters before winter comes down to protection. Too tall, and cool-season lawns mat down and invite mold. Too short, and warm-season lawns lose the insulation that helps them survive the cold.
“You don’t want to leave the grass too tall because the snow can flatten it down and trap moisture underneath, and that’s when you can start having problems with mold and disease,” says Micah Burgess, general manager at Heroes Lawn Care in Omaha, Nebraska. “But you don’t want to cut it too short either, because that can stress the grass and make it more vulnerable to winter damage.”
If your lawn has heavy snow and mold issues, cut your cool-season grass shorter
Cutting to the right height helps prevent snow mold, winterkill, and pests. A lower cut on cool-season lawns discourages pink snow mold and gray snow mold, which appear in spring once the snow melts.
Snow molds are most common in cool-season grasses across the northern U.S. and thrive in cold, wet, matted lawns. Long grass encourages those conditions. Short grass reduces them.
Mowing low also discourages voles and other pests. These tiny creatures like to nest in taller grass, so a shorter cut keeps them from overwintering in your lawn.
A slightly lower final trim also cleans up leftover leaf mulch and debris and keeps the turf from being too tall if it is not done growing.
The stakes are real: Snow mold is one of the most common cool-season turf diseases, and gray snow mold (Typhula blight) develops under prolonged snow cover.
Keeping the final cut short cuts down the matting that fuels it.
Read more:
If your lawn suffers cold damage, cut your warm-season grass taller
Warm-season turfgrass is especially prone to cold damage because it is built for the warm southern U.S. A higher mowing height is thought to reduce warm-season turf winterkill.
A taller cut gives warm-season blades more leaf area for photosynthesis and may reduce winter injury. Extra height also helps the grass crowd out weeds and handle foot traffic better.
Experts at Clemson University recommend raising the height of warm-season grasses by one-half inch to prepare warm-season lawns for winter. More leaf means more stored energy heading into dormancy.
Read more:
Best height for cool-season grass before winter
For cool-season lawns, cut about a half-inch shorter than your usual mowing height. The exact number also depends on the height you mow at all year and how healthy the grass is.
If you seeded this fall, cut new grass before winter once it reaches mowing height, especially cool-season seedlings like Kentucky bluegrass, ryegrass, or fescue.
“I would recommend that you lower the mowing height no more than one notch on your mower, typically one-half inch. This will help you clean up any leftover leaf mulch or debris and give the turf a little trim before winter sets in,” says Kevin Frank, Turf Extension Specialist at Michigan State University.
The number also depends on how healthy the grass is and how tall you mow the rest of the year.
Tammy Sons, CEO of TN Nursery in Altamont, Tennessee, says he recommends going an inch shorter.
“For most cool-season lawns, the target for the last cut (or mowing as we call it in Tennessee) of the season is around 2 to 2.5 inches — noticeably lower than the 3 to 3.5 inches recommended during the growing season, but not scalped,” Sons says.
Below is a chart with the regular mowing heights for cool-season grass.
| Grass Type | Standard Cutting Height for Home Lawns | Last Mow Height Before Winter |
| Fine fescue | 1.5 – 3.5 inches | 2.0 – 2.5 inches |
| Kentucky bluegrass | 2 – 3.5 inches | 2.0 – 2.5 inches |
| Perennial ryegrass | 2 – 3.5 inches | 2.0 – 2.5 inches |
| Tall fescue | 2 – 4 inches | 2.0 – 2.5 inches |
| Creeping bentgrass | 0.5 – 1.5 inches | 1.0 – 1.5 inches |
Data source: Adapted after data from the Purdue University
Note: The best height for winter also varies with the grass variety and location. For a more accurate winter height for your cool-season lawn, contact your local Extension office.
Best height for warm-season grass in winter
Because warm-season grasses are more prone to winterkill, keep them at their current height or mow them one-half inch higher for winter. That extra length keeps the grass and soil insulated from the cold, helping guard against winterkill.
Warm-season grasses fall into two groups: low-mowed (Bermuda, carpetgrass, centipede, Zoysia, and dwarf St. Augustine) and tall-mowed (Bahia, buffalograss, and standard St. Augustine varieties).
A good cutting height for the last mow of the fall is 2 to 2.5 inches for low-mowed grasses, and 3 to 4 inches for tall-mowed grasses.
Below is a chart with regular mowing heights for warm-season grass.
| Grass type | Standard Cutting Height for Home Lawns | Last Mow Height Before Winter |
| Bahiagrass | 3.0 – 4.0 inches | 3.0 – 4.0 inches |
| Bermudagrass | 0.5 – 1.5 inches | 2.0 inches |
| Buffalograss | 2.0 – 4.0 inches | 3.0 – 4.0 inches |
| Carpetgrass | 1.5 – 2.0 inches | 2.0 – 2.5 inches |
| Centipedegrass | 1.5 – 2.0 inches | 2.0 – 2.5 inches |
| St. Augustine dwarf varieties | 2.0 – 2.5 inches | 2.0 – 2.5 inches |
| St. Augustinegrass std. varieties | 2.5 – 4.0 inches | 3.0 – 4.0 inches |
| Zoysiagrass | 1.0 – 2.5 inches | 2.0 – 2.5 inches |
Data source: Adapted after data from IFAS Extension University of Florida
Note: The best height for winter also varies with the grass variety and location. For a more accurate winter height for your warm-season lawn, contact your local Extension office.
When to stop mowing for the year
Stop mowing for the year once your grass stops growing, usually when air temperatures consistently stay below about 55 degrees Fahrenheit or the first frost hits. At that point the grass goes dormant, and mowing no longer helps.
So when does grass stop growing? Cool-season grasses stop when soil temperatures drop below 40 to 45 degrees Fahrenheit. Warm-season grasses follow a different seasonal growth pattern and go dormant below about 50 to 55 degrees.
The first frost is another signal. By then, your lawn should already be at its winter cut height. Knowing how short to cut grass safely keeps you from scalping the turf. In mild climates where grass grows year-round, you will keep mowing lightly through the season.
To prepare for the final mow of the season, check your first frost date and remove no more than one-third of the blade per mow.
Then work backward from that date to see how many mows you have left, so you can lower the height gradually instead of all at once.
Mow less frequently as growth slows, removing no more than one-third of the blade each time, and avoid mowing in wet weather, which leaves ruts and mats the turf.
While you are winding down, tackle the rest of your fall prep too: removing fallen leaves, applying fertilizer, aerating and dethatching, winterizing the sprinkler system, and storing your equipment, all covered in How to Winterize Your Lawn.
A fall aeration pass is another good way to relieve compacted soil before the cold sets in.
FAQs
Usually not, unless you live in a warm, subtropical climate. Dormant or frozen grass is easily damaged, and hold off if a hard freeze is coming.
No, not right away. Wait until the frost melts and the blades dry, since mowing frozen or frost-coated grass bruises the crown and slows recovery. Never mow within two days of a frost in the forecast.
Start once the grass greens up and reaches about 3 inches, usually when soil temperatures climb back above 50 degrees, keeping that first spring cut on the taller side.
Bundle up and let a pro handle it
If your fall schedule leaves no time for the last cuts of the year, Lawn Love can connect you with a pro in about two minutes. They will mow the grass and leaves and get your lawn through the fall and winter weather.
Wondering what that last cut runs? A single lawn mowing depends on lawn size and add-ons like leaf removal, so booking a pro for the final mows of the season is an easy, budget-friendly way to wrap up fall.
Main Image: Garden field mowing using riding tractor mower. Image Credit: Tomasz Zajda | Adobe Stock Free | License
Related Posts:
