Fertilizing warm-season turf: bermudagrass and zoysia timing by season
Cool-season lawns eat nitrogen in fall. Warm-season lawns eat it while they are green and growing — then stop. The bag does not know which calendar you need.
Dormant turf gets zero nitrogen
NC State maintenance calendars put it bluntly for bermuda, zoysia, St. Augustine and centipede in winter: do not fertilize. Clemson wants night temperatures near 70°F and a fully greened canopy before the first spring nitrogen. Feeding brown grass after a freeze to “wake it up” is the opposite of what UF/IFAS recommends.
Convert bag analysis to pounds of nitrogen with the fertilizer calculator. Cool-season schedule lives on the cool-season fertilizing guide.
When: after green-up, stop by mid-August
- Growing season — nitrogen only after full spring green-up through mid-August (Clemson / Virginia Tech Southeast anchor)
- Dormant and late — no nitrogen on brown turf; late N delays dormancy and raises winter injury risk
- Start after full green-up. Not on the first green fleck. Clemson ties the first feeding to a fully greened lawn and warm nights; UGA wants soil near 4 inches at or above 65°F and rising. Texas A&M waits until the lawn — not the weeds — has been mowed two or three times.
- Feed through the summer growing season. Split the annual nitrogen into applications of about ½–1 lb of nitrogen per 1,000 sq ft (UGA, Clemson, NC State). NC State’s bermuda calendar often uses about 1 lb every 4–6 weeks from June through August after a lighter spring pass.
- Stop in mid-August in much of the Southeast. Clemson’s winterize guidance and Virginia Tech’s warm-season program treat August 15 as the latest nitrogen date. Late nitrogen keeps tissue soft when the plant should be hardening for dormancy.
How much nitrogen in a year
Ranges below are pounds of nitrogen per 1,000 square feet per year — not pounds of product. Use the bag’s first number (the N in N-P-K) with the calculator.
| Species | Annual N (lb / 1,000 sq ft) | Notes |
|---|---|---|
| Bermudagrass | 2–5 | UGA Basic Management 2024. Clemson lists 2–4; UF/IFAS EP353 runs higher in South Florida (5–7). |
| Zoysiagrass | 2–3 | UGA. Clemson 2–4; Virginia Tech 1–2 for mature zoysia — report the lower band if you manage lightly. |
| St. Augustinegrass | 2–4 | Clemson HGIC 1218 and UGA Field Report; NC State never above 4 lb N/year. UF South Florida can run higher. |
| Centipedegrass | 1–2 | UGA, Clemson, NC State — do not push above 2 lb. Over-feeding is the usual failure mode. |
Virginia Tech notes that mature zoysia and centipede need less nitrogen than bermuda. Pushing centipede past about 2 lb/year is how lawns get thatchy and weak (Clemson, NC State).
Per application
- Typical pass: ½–1 lb of nitrogen per 1,000 sq ft (UGA, Clemson).
- Ceiling on a single pass: Texas A&M and UF/IFAS keep soluble nitrogen at or below about 1 lb (UF often ≤0.7 lb soluble; higher only with enough controlled-release nitrogen under Florida rules).
- Do not dump the year in May. One heavy spring load is the program that burns turf and feeds weeds — same rule as cool-season, different months.
Why late nitrogen hurts
Warm-season grass needs to enter fall with less soft top growth. Virginia Tech links aggressive late-summer or early-fall nitrogen on bermuda to higher winter injury. UGA Forsyth warns that September nitrogen can delay dormancy and set lawns up for spring dead spot. NC State zoysia calendars say do not apply nitrogen from September through November (potassium-only programs are a separate conversation).
Regional exceptions — do not homogenize:
- NC State bermuda allows up to ½ lb of nitrogen in September (or about four weeks before first frost) as an optional pass — lighter and later than a summer feeding, not a green light for a full rate in October.
- Texas A&M schedules a deliberate fall nitrogen application no later than about six weeks before the local first frost — that is a Texas calendar, not Clemson’s August 15 rule.
- South Florida (UF/IFAS) can fertilize much of the year where growth never fully stops; north and central Florida still close nitrogen for winter months (EP236 / EP353).
Opposite of cool-season
Virginia Tech puts cool-season nitrogen roughly mid-August through early November, and warm-season nitrogen roughly April 1 through August 15. UGA says tall fescue is fed in fall and late winter — not late spring and summer — while warm-season grass is fed only in its growing season. If your lawn is Kentucky bluegrass or tall fescue, use the cool-season fertilizing guide. If you are not sure of the species, identify it first.
Related
- Fertilizer calculator — bag analysis → pounds of N.
- Seeding a warm-season lawn — soil above ~65°F.
- Mowing height by species — bermuda and zoysia cut low.
- Is it time? — soil temperature for regional timing pages.
Questions people actually ask
When should I fertilize bermudagrass or zoysia?
After the lawn is fully green in spring, through mid-August in much of the Southeast. Clemson and Virginia Tech treat August 15 as the latest nitrogen date for most warm-season programs. Do not fertilize brown, dormant turf in winter.
How much nitrogen does a warm-season lawn need in a year?
UGA puts bermudagrass at 2–5 lb of nitrogen per 1,000 sq ft per year and zoysia at 2–3 lb. Centipede stays at 1–2 lb. Split that across several applications of about ½–1 lb each — never dump the annual total in one pass.
Why is late nitrogen a problem?
Nitrogen late in the season keeps warm-season grass growing when it should be hardening off. Virginia Tech links aggressive late nitrogen on bermuda to higher winter injury; UGA Forsyth warns September nitrogen can delay dormancy and set lawns up for spring dead spot.
Can I fertilize to green up after a freeze?
No. UF/IFAS says winter fertilizer to force green-up after a freeze does more harm than good. Wait for active growth and the soil/temperature cues your extension uses.
Is this the same schedule as cool-season grass?
Opposite seasons. Cool-season lawns get their main feedings in late summer and fall (Penn State). Warm-season lawns eat nitrogen in the heat of the growing season and stop before fall dormancy. Mixing the calendars is how people burn or thin a stand.
Sources
- NC State Extension — Bermudagrass Lawn Maintenance Calendar: winter “do not fertilize”; summer schedule; optional light September N.
- NC State Extension — Zoysiagrass Lawn Maintenance Calendar: no N Sep–Nov; winter ban.
- Clemson HGIC — Bermudagrass Maintenance Calendar: 2–4 lb N/year; no N Jan–Apr until greened.
- Clemson HGIC — winterize / August 15 nitrogen cutoff: latest N date for warm-season lawns in much of South Carolina.
- Virginia Tech — Lawn Fertilization in Virginia: warm-season window Apr 1–Aug 15; late N and winter injury; contrast with cool-season.
- University of Georgia — Basic Turfgrass Management (2024): annual N by species (bermuda 2–5, zoysia 2–3, centipede 1–2).
- UGA Forsyth — Fall care for warm-season lawns: September N, dormancy delay, spring dead spot risk.
- UF/IFAS EP353 — Florida lawn fertilization: regional annual N tables.
- UF/IFAS EP236: do not fertilize when grass is not growing; winter leaching risk.
- Texas A&M AgriLife — Lawn Fertilization for Texas Warm-Season Grasses: fall N within ~6 weeks of first frost; start after 2–3 mowings.