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The short answer: cool-season and warm-season lawns run opposite calendars. Cool-season grass is fed and seeded in early fall and left alone in midsummer. Warm-season grass is fed from late spring through midsummer and left alone in fall and winter. Follow the wrong column and you will feed a dormant lawn and seed at the one time of year the seed cannot take.
That single split is the most commonly botched thing in lawn advice, so the two calendars below are kept entirely separate. Find your family first, then read only that column.
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Which Lawn Do You Have?
Cool-season — tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue. Dominant from roughly the Ohio Valley north and across the Pacific Northwest. Greens early, grows hardest in spring and fall, goes semi-dormant and straw-colored in summer heat, holds color into winter.
Warm-season — Bermuda, zoysia, St. Augustine, centipede, bahia, buffalograss. Dominant across the South and Southwest. Fully brown and dormant all winter, slow to wake in spring, explosive growth in July and August.
The winter test is definitive: a lawn that is completely straw-brown in January is warm-season. In the transition zone, from Virginia across to Kansas, both are grown side by side and the neighbor’s schedule is frequently the wrong one to copy. If you are unsure which species you have, the identification notes are in mowing height by grass type.
Adjust every date below by your latitude. The calendar is written for the middle of each range; shift roughly two weeks earlier for every USDA zone warmer and two weeks later for every zone colder.
Cool-Season Calendar
| Month | What to do |
|---|---|
| January | Nothing on the lawn. Stay off frozen turf. Service the mower, sharpen or replace the blade, order a soil test kit while labs are quiet. |
| February | Still dormant in most of the range. Clear fallen branches and any matted leaves. Watch for snow mold as snow retreats — light raking is usually the only treatment needed. In the southern part of the range, watch soil temperature for pre-emergent timing. |
| March | First mow when growth resumes, at your normal height rather than low. Apply crabgrass pre-emergent when soil at 2 in holds 55°F for three days — forsythia dropping its blooms is the reliable local cue. Rake out winter debris. Do not fertilize heavily yet. |
| April | Mow every 5 to 7 days as growth accelerates. Apply a light spring feeding, roughly 0.5 to 0.75 lb of nitrogen per 1,000 sq ft — heavy spring nitrogen buys top growth at the expense of roots. Spot-treat broadleaf weeds. Repair bare patches with seed only if you must; fall is better. |
| May | Peak growth. Mowing every 4 to 6 days is normal. Best month for broadleaf herbicide, when weeds are actively growing and temperatures are still under 85°F. Second pre-emergent application if you are 8 to 10 weeks past the first. Begin raising the mowing height at month end. |
| June | Raise the deck a half-inch to an inch for summer — 3.5 to 4 in for tall fescue. Start deep watering, 1 to 1.5 in per week including rainfall, in one or two soakings. Apply grub preventive if you have had grub damage before, mid-June through mid-July. Stop fertilizing. |
| July | Protection month. No fertilizer, no herbicide above 85°F, minimal traffic. Mow high and only every 10 to 14 days. Either water consistently or let the lawn go dormant, but do not alternate. Watch for brown patch in humid regions — it favors evening watering and excess nitrogen. |
| August | Keep protecting through the first three weeks. In the last week of August, northern lawns start the big fall project: order seed, arrange a core aerator, and plan the weekend. Stop any lingering pre-emergent plans — you cannot seed within 10 to 12 weeks of applying it. |
| September | The most productive month of the year. Core aerate, dethatch if the layer exceeds a half-inch, and overseed at 4 to 6 lb of tall fescue per 1,000 sq ft. Apply starter fertilizer. Water lightly two or three times a day until germination. Lower the mowing height back toward normal. |
| October | The most valuable feeding of the year: a full application of nitrogen while top growth slows and roots keep working. Excellent month for broadleaf herbicide, as perennial weeds move resources to their roots and take the product with them. Mulch fallen leaves with the mower rather than raking. Keep new seedlings watered. |
| November | Keep mowing while it grows, at longer intervals. Take the last one or two cuts a half-inch lower than normal so grass does not mat under snow — a gradual step down, never a scalp. Clear all leaves before winter. A final light feeding is worth it in zones 6 and warmer. |
| December | Done. Stay off frozen and frost-covered grass. Drain and store hoses, run the gas mower dry or add stabilizer, store batteries at partial charge somewhere above freezing. |
If you do only three things on a cool-season lawn, make them the September aeration and overseeding, the October feeding, and mowing tall all summer. Those three outrank everything else combined.
Warm-Season Calendar
| Month | What to do |
|---|---|
| January | Fully dormant and brown, which is normal and healthy. No nitrogen under any circumstances. Treat winter annual weeds — annual bluegrass, henbit, chickweed — with a post-emergent on a mild day, since they stand out clearly against dormant turf. Service the mower. |
| February | Still dormant. Apply pre-emergent late in the month across the Deep South, before soil reaches 55°F. Water occasionally during long dry, windy spells; dormant does not mean the roots are safe from desiccation. |
| March | Pre-emergent now if not already applied — this is the critical window in most of the range. Green-up begins in the warmest areas. Still no nitrogen: feeding a half-dormant warm-season lawn feeds the weeds and invites disease. |
| April | Green-up. Once the lawn is more than half green, take a low cut to remove dead winter growth and let soil warm — Bermuda and zoysia genuinely benefit from this scalping, unlike cool-season grass. Bag those clippings. Dethatch now if needed. Still hold the fertilizer. |
| May | Feed once the lawn is fully green and has been mowed two or three times, about 1 lb of nitrogen per 1,000 sq ft. Best month to core aerate, and the window for seeding, sprigging or plugging new areas once soil passes 65 to 70°F. Second pre-emergent 8 to 10 weeks after the first. Centipede takes a much lighter hand — a single light feeding a year is plenty. |
| June | Peak growing season. Mow every 4 to 6 days on Bermuda at 1.5 in. Water 1 to 1.5 in per week. Feed again if you are on a full program. Grub preventive if you have a history. This is when a warm-season lawn does its repairing and spreading. |
| July | Keep it up — mow frequently, feed if your program calls for it, water deeply. Watch for chinch bugs in St. Augustine, which produce expanding yellow-to-brown patches in the hottest, sunniest areas, and for large patch and gray leaf spot in humid weather. |
| August | Last full feeding for most of the range. Mowing frequency stays high. Keep watering — August drought stress carries into the following spring for warm-season grass because it weakens rhizomes and stolons. |
| September | Final nitrogen application no later than about six weeks before your first expected frost; late nitrogen pushes tender growth into the first freeze. A potassium-only application is useful for winter hardiness. Apply fall pre-emergent when soil drops to about 70°F to stop winter annual weeds. |
| October | Growth slows sharply. Raise the mowing height slightly for the last few cuts. No nitrogen. If you want winter color, overseed dormant Bermuda with ryegrass now — understanding that it is cosmetic and will compete with the Bermuda next spring. |
| November | Dormancy after the first hard frost, and the lawn turns straw-brown across a week or two. Final cleanup, last mow, leaves cleared. Winterize equipment. |
| December | Dormant. Stay off it during frost. Occasional watering in prolonged dry spells only. |
The two errors that ruin warm-season lawns are feeding too early in spring, before the grass is truly awake, and feeding too late in fall, which leaves tender growth exposed to the first freeze. Both are calendar errors rather than product errors.
The Anchor Tasks, Wherever You Live
- Soil test every three years. A lab test through a state extension service returns pH, organic matter, phosphorus, potassium and specific recommendations for very little money. Guessing at amendments for three years costs more than the test. See how to read a soil test.
- Sharpen the blade twice a season. Roughly every 20 to 25 hours of mowing. A dull blade tears the leaf and leaves the whole lawn looking hazy and pale a day later.
- Mow by height, not by the day. The one-third rule sets the interval, and it swings from four days to three weeks across a season — see how often to mow.
- Water deeply and rarely. One to 1.5 inches a week in one or two soakings, early in the morning. Details in how much to water a lawn.
- Aerate compacted lawns annually, in fall for cool-season and late spring for warm-season. Whether you need that or dethatching is settled in dethatching vs aerating.
Equipment shows up in this calendar twice — spring service and fall winterizing — and a mower you do not dread using is what makes the mowing intervals above realistic rather than theoretical. The ranked field is in best lawn mowers, and the feeding products behind the fall and late-spring applications are compared in best lawn fertilizer. The September project itself is stepped out in how to overseed a lawn.