When to Stop Mowing: The Last Mow of the Year by Zone

Cool-season lawns: mow until it stops growing

Iowa State says the foliage of cool-season grasses such as Kentucky bluegrass stops growing when daytime highs are consistently below 50 °F, and that once it stops, the mower can be put away. University of Illinois Extension says to keep mowing until the grass is completely dormant, and to finish at about two inches; it gives mowing until dormant as a way to limit both vole damage, from the runways voles make under snow, and snow mold.

Penn State mows cool-season lawns at 2 inches or higher while they grow, and Clemson mows tall fescue at 3 inches through winter and keeps it clear of leaves. Clemson and UF/IFAS both remove no more than a third of the blade at a mowing, which matters as the season ends: do not make up for missed mowings by cutting short.

Warm-season lawns: raise the mower, then stop

Warm-season grasses go dormant at the first heavy frost, turn brown and green up slowly the next spring (NC State). Before that, Clemson raises the mower slightly on Bermudagrass once nights fall below 70 °F, so the grass has more leaf surface and is acclimated by the first frost; it also says a higher cut in late summer deepens roots and leaves longer blades to make food for winter. UGA Extension in Dougherty County sets the blade to 2 inches in October for Bermudagrass.

UF/IFAS gives the mowing heights for Florida lawns, and says not to mow St. Augustinegrass lower than three inches over winter (only the dwarf varieties go lower):

In South Florida, UF/IFAS says lawns usually stay green over winter, so the mower keeps going at a slower pace. Where a Bermudagrass lawn has been overseeded with ryegrass, you mow the ryegrass all winter instead — see when to overseed.

After the last mow

• Clear the leaves. Clemson says leaves left on a lawn cut its ability to make food before winter, and Illinois lists debris on the grass among the causes of snow mold.
• Sharpen the blade. Clemson sharpens it at least before the growing season starts; a dull blade tears rather than cuts.
• Clean the mower. UF/IFAS washes the mower after use to reduce rust and the spread of weed seed.
• Lime, if a soil test calls for it. Penn State prefers fall liming, since rain, snow and freezing and thawing work it into the soil; NC State says winter is usually best. For the rest of the season, see winter lawn care.

Common mistakes

• Stopping too early. Illinois says to mow until the grass is completely dormant.
• Scalping the last cut. Clemson and UF/IFAS take no more than a third of the blade at once.
• Cutting a warm-season lawn short for winter. Clemson raises the mower in fall instead.
• Leaving leaves on the lawn. Clemson and Illinois both say to clear them.
• Mowing wet grass with a rotary mower. UF/IFAS says the clippings clog it; mow when the grass is dry.

Every lawn job by zone

• Cool-Season vs Warm-Season Grass: Which Lawn Grass by Zone
• When to Fertilize Your Lawn by Zone
• When to Overseed Your Lawn by Zone
• When to Aerate Your Lawn by Zone
• When to Stop Mowing: The Last Mow of the Year by Zone — this page
• Winter Lawn Care and Dormant Lawns, by Zone
• Fall Lawn Care by Region: Fertilize, Aerate, Overseed
• Your USDA hardiness zone by ZIP code

Where there is no source here

We found no Texas source on the last mow of the year that we could read. The cool-season rules are Iowa State’s and Illinois’, written for the Midwest; the warm-season ones are Clemson’s, UGA’s and UF/IFAS’s, for the Southeast.