When to Stop Mowing Your Lawn in Fall

Updated November 3, 2026

There’s no calendar date for the last mow. Extension services agree on one rule: keep mowing as long as the grass keeps growing. Iowa State says “Continue to mow the lawn until the grass stops growing in the fall”, and Wisconsin calls mowing until the lawn stops growing “the most important lawn care practice for the balance of fall” (Iowa State; Wisconsin Horticulture).

At a glance

The rule: mow until the grass stops growing

For cool-season lawns, Iowa State says growth “stops growing when daytime high temperatures are consistently below 50 degrees Fahrenheit” (Iowa State). So watch the forecast, not the calendar: once daytime highs stay below about 50°F and the lawn no longer needs a trim, you’ve made your last mow. When that happens depends on where you live and on the year. Check frost dates for your ZIP to see when your cold season usually arrives.

Every mow, all fall Follow the one-third rule: “never remove more than ⅓ of the total leaf area at any one time” (Iowa State).

How high to mow in fall

Iowa State suggests lowering cool-season grass in mid- to late September “from 3.0 to 3.5 inches to 2.5 to 3 inches” (Iowa State). UMN’s turfgrass team says “If the standard mowing height for your lawn is 2.5 to 3 inches, we suggest to keep it at that”, and if it’s taller, to bring it down to 3 inches before winter (UMN Turfgrass Science). Wisconsin’s general advice is “Keep the lawn mowed between 2½–3½ inches tall” (Wisconsin Horticulture), UMN’s year-round advice is to “maintain a height of 3 inches or higher” (UMN Extension), and Penn State says “Most lawns should be mowed at 2 inches or above and on a regular basis as long as the grass is growing.” (Penn State Extension).

The last mow: don’t scalp it

Wisconsin says “If you want to set the mower a little shorter than normal that is okay, but the final mowing does not need to be excessively short” (Wisconsin Horticulture). If you do lower the height, UMN’s turf team says to “mow several times at this height, not just the final mow” (UMN Turfgrass Science). Don’t leave it too long either: Wisconsin says “Lawns going into winter excessively tall are prime candidates for snow mold disease development and damage from voles” (Wisconsin Horticulture).

• Keep mowing while the grass is still growing.
• Cut no more than one-third of the blade each time.
• Lower the height a little at most, over several mows.
• Don’t leave the lawn long going into winter.
• Shred or remove leaves so they don’t pile up on the grass.

Lawn looking brown, white or ragged right after you mow? See why your lawn looks bad after mowing.

Mulch or bag the last mow?

Mulching is the default. UMN suggests you “Mulch tree leaves to return nutrients to your soil”, and if you then see more leaves than lawn, “collect the tree leaves with the next mowing(s)” (UMN Extension). Bagging the last mow is fine too: “You can use a bagging attachment on the last mow of the year to help remove any excess organic matter and leaf litter” (UMN Turfgrass Science). Wisconsin says “a two-inch cover of mulched (shredded) leaves is reasonable” over winter, but “accumulated leaves of a four-inch depth are highly likely to lead to winter damage” (Wisconsin Horticulture).

Mid-Atlantic timing (examples, not a calendar rule)

Keep the Iowa State 50°F cue as the rule. Regional calendars only show when mowing often continues in a mild year:

In Maryland, University of Maryland Extension’s lawn calendar says cool-season lawns may still need mowing in mild weather from late October into mid-November, and that the final mow of the season “may be in late November”. For that last cut, UMD says mowing “½ inch shorter than usual” (tall-fescue calendar: “1/2 - 1 inch shorter than the usual height”) can improve air circulation and discourage snow mold (University of Maryland Extension; University of Maryland Extension).

In Delaware, University of Delaware turf BMPs say cool-season mowing typically begins late March to early April and “mowing will not typically be required after approximately November 15th” (University of Delaware Extension). That is an average, not a hard stop—pair it with the 50°F rule above.

Warm-season lawns

Bermudagrass, zoysia, centipede and St. Augustine stop when they go dormant. Mississippi State says “Grass will continue growing, however, until the first frost marks the beginning of dormancy” (Mississippi State). For dormant warm-season turf, LSU says “Mowing while turfgrass is dormant is generally not necessary” (LSU AgCenter), and Nebraska’s warm-season calendar lists “Mowing is not necessary” for late fall (Nebraska Extension). We found no extension temperature cue for warm-season grass, so go by growth. Heights: UGA says “The recommended mowing height for bermudagrass, centipedegrass, and zoysiagrass is 1-2 inches”, and Mississippi State says to “Raise mowing height to 3 inches on St. Augustinegrass to promote winter hardiness” (UGA Extension; Mississippi State).

Thin spots? See whether it’s too late to plant grass seed, including dormant seeding.

Leaves piling up on the lawn? See what to do with fall leaves, including mowing them into the lawn.

Fall weeds still growing? See fall lawn weed control. For the rest of the month, see November garden tasks by zone.

Got your results back? Our soil test translator explains each number on a university lab soil test report in plain English.