When should I fertilize my lawn in the fall?

It depends on the grass. Cool-season lawns are fed in fall: Penn State Extension says late summer or early fall, Oregon State uses Labor Day and Thanksgiving, and UGA Extension’s Athens-area calendar feeds tall fescue in September and November. Warm-season lawns are not: UGA Extension in Glynn County lists May through August as the best months for Bermuda, St. Augustine and zoysia, and its Dougherty County guide says do not fertilize after September. In Florida, UF/IFAS gives September as the last recommended time in North Florida and October in Central Florida, and says grass in parts of South Florida may grow and need fertilizer year-round.

When is it too late to seed a lawn in the fall?

Penn State Extension says seeding later than mid-October is not suggested for most of Pennsylvania. For tall fescue in Georgia, UGA Extension says September and October are ideal and that if seeding would fall after mid-November, wait until mid-February.

Should I aerate in the fall?

Cool-season lawns, yes: Penn State says aerate in cool weather, early to mid-spring or late summer to early fall, with enough moisture for the tines to pull plugs. For a warm-season Bermuda lawn, UGA Extension in Dougherty County says aerate only when needed, during active growth.

Can I keep a Bermudagrass lawn green in winter?

By overseeding it with perennial ryegrass. A University of California Cooperative Extension publication puts the best time in California and Arizona at roughly mid-October to mid-November: too early and the ryegrass competes with Bermudagrass that is still growing; too late and it has no time to establish before cold weather.

Should I overseed my Florida lawn for winter?

UF/IFAS calls North and Central Florida lawns good candidates for overseeding with ryegrass; South Florida lawns usually stay green and do not need it. Overseed North Florida lawns October to November and Central Florida lawns October to early December, once daytime temperatures are consistently in the low to mid 70s °F. Do not mow St. Augustinegrass lower than three inches, let the winter grass die out in late spring, and do not fertilize it after February in South Florida or after March in North Florida.

Guides

Fall Lawn Care by Region: Fertilize, Aerate, Overseed

Fall is the most important season for a cool-season lawn and almost a rest season for a warm-season one. Feeding, aerating and seeding at the right time depends first on which kind of grass you have, then on where you live.

Published October 22, 2026 · Updated October 27, 2026 · Cite this page

First, which grass do you have?

Cool-season grasses — Kentucky bluegrass, perennial ryegrass, fine fescues and tall fescue — grow best in cool weather, so their seeding, feeding and aeration fall in late summer and fall. Warm-season grasses — Bermuda, zoysia, centipede and St. Augustine — grow in summer and go dormant in winter; for them, fall is mostly about doing less. Which grasses suit each zone, and where the two kinds meet in the transition zone, is on cool-season vs warm-season grass; each job by zone is linked at the foot of this page.

Fall lawn calendar by region

Region	Grass	Fertilize	Aerate	Seed or overseed
Northeast and Mid-Atlantic Pennsylvania, USDA zones 5b–8a	Cool-season: Kentucky bluegrass, perennial ryegrass, fine fescues	Late summer to early fall (and/or mid- to late spring)	Late summer to early fall, in cool weather with moist soil	Late summer to early fall; not later than mid-October in most of the state
Pacific Northwest Oregon, USDA zones 5b–9b	Cool-season	Four times a year: Memorial Day, Fourth of July, Labor Day, Thanksgiving	Fall, focusing on bare or compacted spots	Fall (or spring), after core aeration
Southeast Piedmont (transition zone) Athens area, Georgia, USDA zones 8a–8b	Tall fescue (cool-season)	September, November, February and April	—	September and October; September is ideal. After mid-November, wait until mid-February
Coastal and South Georgia Glynn County, Georgia, USDA zone 9a	Warm-season: Bermuda, centipede, St. Augustine, zoysia	May to August (centipede May and July). None in fall	Only during active growth	Not a fall job for warm-season grass
North Florida Florida (UF/IFAS)	Warm-season, including centipede and St. Augustine	September is the last recommended time	—	Overseed with ryegrass October to November, once days are consistently in the low to mid 70s °F
Central Florida Florida (UF/IFAS)	Warm-season, including centipede and St. Augustine	October is the last recommended time	—	Overseed with ryegrass October to early December, once days are consistently in the low to mid 70s °F
South Florida Florida (UF/IFAS)	Warm-season	In parts of South Florida grass may grow and need fertilizer year-round	—	Usually stays green; overseeding is not needed
California and Arizona Warm-season lawns	Bermuda, often overseeded with perennial ryegrass for winter green	—	—	Overseed ryegrass roughly mid-October to mid-November
Mountain West Lake Tahoe basin	Cool-season	Fall, with slow-release nitrogen	Fall	Overseed after fall dethatching or core aeration

Each row is one extension service's advice for the area named under it; where that area is one state or county, its zones are shown, from the USDA 2023 map. The Florida rows follow the north, central and south split UF/IFAS uses, so no zones are shown for them. A dash means the source gives no fall timing. Your own state's extension service has the calendar for your county — look up your zone with the ZIP code zone finder, or find your state page.

Cool-season lawns: the fall to-do list

Aerate in late summer to early fall. Penn State: core-aerate in cool weather so the grass recovers quickly, with moist soil so the hollow tines pull plugs. Break the plugs up once they dry. Solid spikes are not core aeration.
Overseed thin areas right after. Penn State says early-fall overseeding can follow aeration, and Oregon State calls overseeding after core aeration an excellent way to get the seed-to-soil contact germination needs. Oregon State says, unless it rains, water lightly each day to keep the soil moist until the seed germinates.
Fertilize. Penn State: a fertilizer with some slow-release nitrogen in late summer or early fall, at the label rate. Oregon State suggests a high-nitrogen, low- or no-phosphorus product (it gives 20-2-6 as an example), and its Oregon calendar includes Labor Day and Thanksgiving feedings.
Lime if a soil test says so. Penn State prefers fall liming, because winter rain, snow and freeze-thaw work it into the soil.
Treat broadleaf weeds such as dandelion while they are actively growing in early fall (Penn State).
Keep mowing as long as the grass grows — Penn State says at 2 inches or higher; UC Cooperative Extension in the Lake Tahoe basin mows cool-season lawns at 3 to 3½ inches.

Warm-season lawns: what to do, and what not to

Stop fertilizing. UGA Extension's Dougherty County Bermuda guide gives September as the last feeding and says do not fertilize after September, to help prevent fungus such as brown patch.
Raise the mower. The same guide sets the blade to 2 inches in October to prepare Bermuda for winter.
Leave aeration for summer. Aerate during active growth, when the soil is moist (Dougherty County).
Overseed for winter color, if you want it. Perennial ryegrass sown into Bermudagrass gives a green lawn over winter and dies back as spring heats up. A University of California publication gives roughly mid-October to mid-November as the best window in California and Arizona.

Florida

Last feeding. UF/IFAS gives September as the last recommended time to fertilize in North Florida and October in Central Florida. In parts of South Florida grass may grow and need fertilizer year-round.
Watch for large patch. UF/IFAS says centipede and St. Augustine lawns are very susceptible to large patch fungus in fall.
Overseeding. North and Central Florida lawns are good candidates for ryegrass; South Florida lawns usually stay green and do not need it. Overseed North Florida lawns October to November and Central Florida lawns October to early December, waiting until daytime temperatures are consistently in the low to mid 70s °F.
Mow St. Augustinegrass no lower than three inches (UF/IFAS).
In spring, let the winter grass die out in late spring, and do not fertilize it after February in South Florida or after March in North Florida.

In the transition zone, UGA's Athens-area calendar has one more fall job for lawns you will not overseed: a pre-emergent weed preventer, against chickweed and annual bluegrass. For any weed product, follow the label and your state’s rules.

Your ZIP code

Your ZIP, your answer

Enter your ZIP code to see your USDA zone and the freeze dates of the NOAA station nearest you.

This box needs JavaScript to answer on the page. Without it, the button opens the ZIP code zone finder; your zone’s row is in the table on this page.

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Full details for any ZIP code: ZIP code zone finder.

Common mistakes

Feeding a warm-season lawn in fall. Both UGA warm-season sources here stop by September; UF/IFAS stops in September in North Florida and October in Central Florida.
Overseeding a South Florida lawn. UF/IFAS says those lawns usually stay green and do not need it.
Seeding cool-season grass too late. After mid-October in Pennsylvania; after mid-November for fescue in Georgia, wait for February.
Aerating dry soil. The tines need moisture to pull plugs (Penn State).
Dethatching in late fall. Penn State says not in late fall, when winter drying can follow, and only when thatch is an inch or more.
Overseeding without soil contact. Aerate or rake first.
Spreading phosphorus by habit. Penn State says only a soil test tells you how much phosphate and potash the lawn needs.
Overseeding Bermuda with ryegrass too early. The two compete while the Bermuda is still growing (UC).

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
Winter Lawn Care and Dormant Lawns, by Zone
Fall Lawn Care by Region: Fertilize, Aerate, Overseed — this page
Your USDA hardiness zone by ZIP code

USDA hardiness zone by ZIP code
Zones and frost dates by state
What can I still plant? — the vegetable garden this fall
How to Protect Plants from Frost: Covers, Timing, Temps
When to Plant Trees and Shrubs in Fall, by Zone

Questions

When should I fertilize my lawn in the fall?: It depends on the grass. Cool-season lawns are fed in fall: Penn State Extension says late summer or early fall, Oregon State uses Labor Day and Thanksgiving, and UGA Extension’s Athens-area calendar feeds tall fescue in September and November. Warm-season lawns are not: UGA Extension in Glynn County lists May through August as the best months for Bermuda, St. Augustine and zoysia, and its Dougherty County guide says do not fertilize after September. In Florida, UF/IFAS gives September as the last recommended time in North Florida and October in Central Florida, and says grass in parts of South Florida may grow and need fertilizer year-round.
When is it too late to seed a lawn in the fall?: Penn State Extension says seeding later than mid-October is not suggested for most of Pennsylvania. For tall fescue in Georgia, UGA Extension says September and October are ideal and that if seeding would fall after mid-November, wait until mid-February.
Should I aerate in the fall?: Cool-season lawns, yes: Penn State says aerate in cool weather, early to mid-spring or late summer to early fall, with enough moisture for the tines to pull plugs. For a warm-season Bermuda lawn, UGA Extension in Dougherty County says aerate only when needed, during active growth.
Can I keep a Bermudagrass lawn green in winter?: By overseeding it with perennial ryegrass. A University of California Cooperative Extension publication puts the best time in California and Arizona at roughly mid-October to mid-November: too early and the ryegrass competes with Bermudagrass that is still growing; too late and it has no time to establish before cold weather.
Should I overseed my Florida lawn for winter?: UF/IFAS calls North and Central Florida lawns good candidates for overseeding with ryegrass; South Florida lawns usually stay green and do not need it. Overseed North Florida lawns October to November and Central Florida lawns October to early December, once daytime temperatures are consistently in the low to mid 70s °F. Do not mow St. Augustinegrass lower than three inches, let the winter grass die out in late spring, and do not fertilize it after February in South Florida or after March in North Florida.
How do I know if my grass is cool-season or warm-season?: Cool-season grasses — Kentucky bluegrass, perennial ryegrass, fine fescues and tall fescue — grow best in cool weather. Warm-season grasses — Bermuda, zoysia, centipede and St. Augustine — grow in summer, and UGA Extension notes Bermuda goes dormant and turns brown in winter. If you are not sure which you have, ask your county extension office.

Sources

Zones on this page are the USDA Plant Hardiness Zone Map, 2023, for every ZIP code in each source's state or county. Every timing and rate is quoted from the extension publications below, each of which writes for its own area.

Penn State Extension, Lawn Management through the Seasons , by Peter Landschoot (Updated April 30, 2025). Written for: Pennsylvania (USDA zones 5b–8a).
Oregon State University Extension Service, Bring your lawn back to life this fall with renovation and care . Written for: Oregon (USDA zones 5b–9b).
Oregon State University Extension Service, Practical Lawn Care for Western Oregon (EC 1521) (Published July 2018). Written for: Western Oregon.
University of California Cooperative Extension, Fall into Fall Lawn Care . Written for: Lake Tahoe basin.
UGA Extension, Clarke County, Shades of Green newsletter, September 2024 (seasonal calendar; excerpt of UGA Annual Publication 109, Fall Gardening) (September 2024). Written for: Clarke County (Athens), Georgia (USDA zones 8a–8b).
UGA Extension, Glynn County, Lawn Care Information . Written for: Glynn County, Georgia (USDA zone 9a).
UGA Extension, Dougherty County, Bermuda: 5-minute guide to a great lawn . Written for: Dougherty County, Georgia (USDA zones 8b–9a).
UF/IFAS Gardening Solutions, Your Florida Lawn in Winter (Accessed October 2026). Written for: Florida, by north, central and south.
UF/IFAS, Overseeding Florida Lawns for Winter Color (Accessed October 2026). Written for: Florida, by north, central and south.
University of California Cooperative Extension, Center for Landscape and Urban Horticulture, Perennial Ryegrass . Written for: California and the Southwest.

Nothing here replaces your own state's cooperative extension service, which knows your county. Where this site's numbers come from.

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