Outdoor

How do I prepare my lawn for winter?

By Nazrul Islam. Updated October 11, 2026.

When should I stop mowing in the fall?

Keep mowing until the grass stops growing. University of Illinois Extension says to continue mowing until the grass is completely dormant. University of Wisconsin Extension calls fall mowing the most important lawn task for the rest of the season. Grass that goes into winter too tall raises the risk of snow mold and vole damage.

How short should the last mow be before winter?

Extension advice lands in a narrow band. Lower the height gradually over several mowings, not all at once.

University of Minnesota says a lawn normally kept at 2.5 to 3 inches can stay there, and a lawn kept above 3 inches can come down to 3 inches over several mowings. It warns that cutting too short stresses the grass more than the disease or critter problems it is meant to prevent. Wisconsin agrees the last cut does not need to be excessively short.

What should I do with fallen leaves?

Do not let leaves sit on the lawn all winter. Deep piles can smother grass and encourage disease. Illinois lists leaf debris as a snow mold risk factor. University of Minnesota says mulching is fine if you can still see at least 80 to 90 percent grass afterward. Rake up the rest. See whether to rake or mulch leaves.

Should I fertilize my lawn before winter?

It depends on your grass type.

• Cool-season lawns: Fall is the main feeding season. University of Minnesota says not to fertilize past mid-October. Wisconsin points to early September as the key window and advises waiting until spring rather than adding mid-fall nitrogen. Illinois warns against heavy fast-release nitrogen in early to mid-fall and favors slow-release products.
• Warm-season lawns: Stop applying nitrogen. UGA Extension allows a final application in August to very early September. Later feeding can delay dormancy long enough for cold injury. It also sets the lawn up for spring dead spot.

Timing varies by region. Check your state extension service for local dates. More detail is in when to fertilize your lawn.

Is it too late to aerate?

Usually, by the time winter prep starts. Iowa State Extension says September and April are the best times to core-aerate Kentucky bluegrass and other cool-season lawns. Aeration damages turf at first, so grass needs good growing weather to recover. Aerating a lawn that is shutting down for winter gives it no time to heal. If you missed the fall window, plan for spring.

How do I prevent snow mold?

Extension sources list these steps:

• Keep mowing until growth stops, and do not let the lawn go into winter tall.
• Clear or mulch heavy leaf cover.
• Avoid excessive fast-release nitrogen in fall. Use slow-release nitrogen instead.
• Manage thatch and keep surface drainage adequate.
• Improve air circulation by pruning or thinning dense plantings nearby.

Can I walk on a frozen lawn?

Try not to. Nebraska Extension notes that dormant turf cannot recover from damage until spring. Repeated trips along the same path can leave footprints or kill the grass there. Even walking on frosted grass on a cold morning can leave marks. Vary your path, or use a sidewalk. It also notes that wet or frozen soil compacts under foot or vehicle traffic. If damage doesn’t recover, Nebraska suggests overseeding in mid to late April. See how to overseed a lawn.

What about sprinklers and the mower?

Drain in-ground irrigation before a hard freeze. Follow your system’s manual or hire an irrigation pro if it needs compressed air to blow out lines. Shut off and drain hose bibs too; see how to winterize an outdoor faucet.

Put the mower away properly after the last cut. Fuel, oil, and blade care are covered in how to winterize a lawn mower.

Quick answers

What height should I cut my grass for winter? About 2 to 3 inches for cool-season lawns: Illinois says about 2 inches, and University of Minnesota says 2.5 to 3 inches is fine. Warm-season lawns mowed low can be raised to 2 inches.

When should I do the last mow of the season? When the grass stops growing. Keep mowing until then rather than stopping on a fixed date.

Should I fertilize in November? Not according to the extension sources here. University of Minnesota says not past mid-October for cool-season lawns, and UGA says stop nitrogen on warm-season lawns after early September.

Is it OK to leave leaves on the lawn over winter? No. Heavy leaf cover can smother grass and encourage snow mold. Mulch or rake them.

Why are there footprints in my lawn in spring? Walking on frozen or dormant turf damages grass that cannot recover until spring growth starts.