Quick answer: When to fertilize your lawn depends on your grass type. Feed cool-season grass (tall fescue, Kentucky bluegrass, ryegrass) mainly in early fall, with a follow-up in mid-to-late fall and an optional light feeding in late spring. Feed warm-season grass (Bermuda, zoysia, St. Augustine, centipede, bahia) from late spring through summer, starting after the lawn has fully greened up and stopping about 6–8 weeks before your first frost.
Step 1: Know Your Grass Type
| Cool-season grass | Warm-season grass | |
|---|---|---|
| Examples | Tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue | Bermuda, zoysia, St. Augustine, centipede, bahia |
| Where | North, Midwest, Northeast, mountains, Pacific Northwest | South, Southwest, Florida, Gulf Coast |
| Grows most | Spring and fall | Summer |
| Main feeding | Early fall | Late spring to summer |
Not sure? Compare Kentucky bluegrass vs tall fescue or Bermuda vs St. Augustine grass.
The Lawn Fertilizing Calendar
When to Fertilize Cool-Season Lawns
- Early fall (about Labor Day to late September): the most important feeding. Grass is recovering from summer and building roots.
- Mid-to-late fall (October to early November): a second feeding while the grass is still green helps it store energy for winter and green up earlier in spring.
- Late spring (around mid-May to Memorial Day): optional and light. Feeding heavily in early spring pushes leaf growth at the expense of roots and can make summer stress worse.
- Summer: skip it, or use only a light slow-release feeding on irrigated lawns. Fertilizing heat-stressed fescue can encourage disease.
When to Fertilize Warm-Season Lawns
- First feeding: wait until the lawn is fully green and growing, usually when soil stays above about 65°F, which is often after the second or third mowing. Feeding while it is still greening up mostly feeds weeds.
- Summer: feed every 6–8 weeks during active growth, following the label rate.
- Last feeding: about 6–8 weeks before your average first frost. Late nitrogen can reduce winter hardiness.
- Low-input grasses: centipede and bahia need much less nitrogen than Bermuda; one or two light feedings a year is often enough.
When to Fertilize by Region
| Region | Common grass | Typical timing |
|---|---|---|
| Texas (Central and North) | Bermuda, St. Augustine, zoysia | First feeding around mid-to-late April after green-up; summer feedings; last by about September |
| South Texas and Houston | St. Augustine, Bermuda | Start a few weeks earlier (often late March to April); last by early October |
| Florida | St. Augustine, bahia, centipede, zoysia | Spring after green-up and early fall; many counties ban nitrogen and phosphorus fertilizer during the summer rainy season, so check your county’s rules |
| Southeast (GA, SC, NC) | Bermuda, zoysia, centipede; tall fescue in the upper South | Warm-season: May–August. Tall fescue: September–November |
| Colorado and Mountain West | Kentucky bluegrass | Late spring, early fall, and a late-fall feeding before the ground freezes; avoid heavy early-spring feeding |
| Midwest (IL, MI, OH, MN, WI) | Kentucky bluegrass, tall fescue | Late May (light), early September, and late October to early November |
| Northeast (PA, NY, NJ, New England) | Kentucky bluegrass, fescue, rye | Mid-to-late May (light), early September, and October |
| Pacific Northwest | Perennial ryegrass, fine fescue | Spring (April–May) and fall (September–October) |
| Southwest deserts | Bermuda (often overseeded with rye) | Bermuda: late spring–summer; overseeded rye: lightly in fall and winter |
Florida lawns have their own rules; see Florida grass types and the best grass seed for Florida sandy soil.
Feeding will not fix brown patches caused by grubs. If turf peels back easily, see how to get rid of grubs in your yard.
How Much Fertilizer to Apply
Lawn rates are given in pounds of nitrogen (N) per 1,000 sq ft. Most single feedings use about 0.5–1 lb of N per 1,000 sq ft. To turn that into pounds of product:
Pounds of product per 1,000 sq ft = lb of N wanted ÷ (first number on the bag ÷ 100)
| Fertilizer (N-P-K) | For 0.5 lb N | For 0.75 lb N | For 1 lb N |
|---|---|---|---|
| 32-0-4 | 1.6 lb | 2.3 lb | 3.1 lb |
| 24-0-6 | 2.1 lb | 3.1 lb | 4.2 lb |
| 16-4-8 | 3.1 lb | 4.7 lb | 6.3 lb |
| 10-10-10 | 5 lb | 7.5 lb | 10 lb |
Example: a 5,000 sq ft lawn getting 0.75 lb N with a 24-0-6 fertilizer needs 3.1 × 5 = about 15.5 lb of product. Learn what the numbers mean in our 10-10-10 fertilizer guide, and test first: a soil test tells you whether you need phosphorus, potassium or lime.
Apply It Evenly
Uneven spreading causes stripes and fertilizer burn. Use a broadcast or drop spreader, do the perimeter first, and overlap passes correctly. See our best lawn spreaders for picks by lawn size.
Check slow-release lawn fertilizer prices on Amazon
As an Amazon Associate we earn from qualifying purchases.
Special Cases
- New lawn from seed: use a starter fertilizer at seeding, then a regular feeding about 6–8 weeks after germination. See planting grass seed in spring.
- New sod: wait until the roots have knitted into the soil (about 4–6 weeks) before the first regular feeding.
- After aeration or overseeding: early fall is ideal for cool-season lawns; fertilize right after.
- Weed and feed: time it for the weeds, not just the grass, and follow the label on watering.
- Drought or dormancy: do not fertilize brown, dormant grass. Wait for growth to resume.
- Before rain: light rain helps water granules in, but avoid feeding before heavy storms, which wash nutrients into storm drains.
Frequently Asked Questions
What month should I fertilize my lawn?
For cool-season grass, September is the most important month. For warm-season grass, start in April or May after green-up and continue through summer.
Should I fertilize my lawn in spring or fall?
Cool-season lawns benefit most from fall feeding; spring feeding should be light. Warm-season lawns are fed from late spring through summer.
How often should I fertilize my lawn?
Usually 2–4 times a year. High-maintenance Bermuda may need more; centipede and bahia need less.
Is it too late to fertilize in November?
For cool-season lawns that are still green, a feeding in early November is common in many northern areas. For warm-season lawns, it is too late; stop 6–8 weeks before frost.
Should I water after fertilizing?
Most granular fertilizers should be watered in lightly. Weed-and-feed products often need to stay on the leaves, so follow the label.
The Bottom Line
Match the timing to your grass: fall for cool-season lawns, late spring through summer for warm-season lawns. Test your soil, apply about 0.5–1 lb of nitrogen per 1,000 sq ft per feeding with an evenly calibrated spreader, and check local rules before summer feeding. For product ideas, see our Miracle-Gro lawn fertilizer guide.
