Fertilizer for Ryegrass in Winter: Rates and Timing for Overseeded Lawns
Fertilize overseeded ryegrass in winter with about 0.5 lb of nitrogen per 1,000 sq ft, starting after the second mowing. Stop by mid to late January in South Carolina, or by the end of February or March in Florida. That early stop lets the bermuda take the lawn back in spring.
Rye grows all winter. The bermuda under it sleeps. So the rye is the only thing eating. Feed it light, and quit early.
Use a high-nitrogen fertilizer with little or no phosphorus, such as 21-0-0 ammonium sulfate. Use a complete bag such as 16-4-8 if your soil test calls for phosphorus. Clemson's rate is 0.5 lb of nitrogen per 1,000 sq ft after the second mowing. Then one more 0.5 lb feeding in midwinter if the rye loses color. LSU AgCenter allows 0.5 to 1 lb every four to six weeks.
That's about 2.4 lb of 21-0-0 or 3.1 lb of 16-4-8 per 1,000 sq ft for each 0.5 lb feeding. Skip any feeding on frozen ground. Stop on your region's date. Then hold off until several weeks after the bermuda is fully green.
Clemson does not recommend overseeding home lawns, and if you do, only bermudagrass. Not sure what your base grass is? Run a photo through the free grass ID and lawn diagnosis tool first.
The feeding schedule by month
The schedule assumes rye seeded in mid to late October. That's the usual window in much of the South. Mississippi State puts it around mid-October, when soil hits about 70°F. LSU AgCenter says late October to early November. Seeded later? Push the first feedings back to match. The stop dates stay put.
| Month | Rye lawn job | Source |
|---|---|---|
| September | Last light feeding for the bermuda: no more than 0.5 lb N, in September or four weeks before first frost. In the desert, stop nitrogen on the bermuda 30 days before overseeding. | NC State bermudagrass lawn calendar; Arizona AZ1683 |
| October | Seed. Hold the fertilizer until the rye is up. | NC State athletic field calendar (fertilizing while overseeding can push the bermuda to compete) |
| November | First feeding: 0.5 lb N per 1,000 sq ft after the second mowing. UF caps it at 1 lb. | Clemson HGIC 1206; UF/IFAS ENH14 |
| December | LSU and UF programs: second feeding if the rye turns pale, four to six weeks after the first. Nitrogen-only bag. Skip it if the ground is frozen. South Carolina: skip this one and wait for January. | LSU AgCenter; NC State (Nash County) |
| January | South Carolina: the second and last feeding, if needed, by mid to late January. That keeps Clemson's plan at 1 lb N for the winter. | Clemson HGIC 1206 |
| February | South Florida: last feeding by the end of the month. South Louisiana: no fertilizer push as the warm-season grass starts to green. | UF/IFAS ENH14; LSU AgCenter |
| March | North Florida: last feeding by the end of the month. Low desert Arizona: last monthly 0.5 lb feeding. | UF/IFAS ENH14; Arizona AZ1817 |
| April to May | Southeast: no nitrogen for the rye. Feed the bermuda several weeks after it's fully green, and not before 4-inch soil holds at 65°F and rising. Low desert: once nights stay above 60°F, feed 0.25 lb N weekly to push the bermuda. | NC State lawn calendar; UGA Extension; Arizona AZ1683 |
The rye dates above come from the sources. For the bermuda's own spring-to-fall dates by ZIP, use the fertilizer schedule calculator. It does not plan overseeded rye.
How much nitrogen per feeding
Sources agree on the unit. They split on how hard to push. Two of them write for sports fields.
| Source | Per feeding (lb N per 1,000 sq ft) | How often | Written for |
|---|---|---|---|
| Clemson HGIC 1206 | 0.5 | After the second mowing, then once in midwinter if needed | South Carolina home lawns |
| UF/IFAS ENH14 | Up to 1 | After the second mowing, then about 60 days later | Florida home lawns |
| LSU AgCenter | 0.5 to 1 | Every four to six weeks | Louisiana home lawns |
| Arizona AZ1817 | 0.5 | Monthly, October through March | Low desert home and commercial lawns |
| NC State athletic field calendar | 0.5 at most | Every three to four weeks, January to March | Sports fields |
| Texas A&M AgriLife | 0.5, or 1 | Every two weeks, or every four to six weeks | Sports fields |
Season totals spread out the same way. Clemson's plan adds up to 1 lb. Arizona's desert calendar adds up to 3 lb (six feedings of 0.5).
For a home lawn, start at 0.5. Go up to 1 lb only on LSU's or UF's program, and only when the rye is pale. More nitrogen costs you. Clemson and UF both warn that Pythium blight hits over-fertilized, over-watered ryegrass, worst in warm, humid weather. Arizona adds frost damage, more disease and extra mowing to the list.
Pick the bag: high nitrogen, phosphorus by soil test
Nitrogen does the work in winter. Clemson names 16-4-8 or 15-0-15. LSU's Livingston Parish office switches to a nitrogen-only product after the first feeding, such as 33-0-0-12 or urea (46-0-0). A straight 21-0-0 ammonium sulfate does the same job. Arizona's lawn guide uses it in its example: about 2½ lb per 1,000 sq ft for 0.5 lb N.
Phosphorus is the one to check first. Arizona and LSU put phosphorus in the first feeding for young seedlings (16-20-0 and 13-13-13). NC State's Nash County office says a soil test tells you how much phosphorus, potassium and lime you need. You may not need them at all. Phosphorus in every winter feeding? Skip it unless your soil test shows it's low. The soil test analyzer reads a lab report for you.
Potassium is optional. Arizona's 1997 November tip suggests a 3-1-2, 4-1-2 or 2-1-2 ratio for that month. It says the added potassium helps winter hardiness. Desert note from the same tip: November is the last ammonium-heavy feeding. Nitrate forms after that.
Quick release or slow release? Both work. NC State's athletic field calendar gives two options. 0.5 lb every two to three weeks. Or 1 lb of controlled-release nitrogen every four to six weeks. New to bag numbers? See how to read fertilizer numbers.
Feeding a fescue or bluegrass lawn this winter instead? Different job. The winter lawn fertilizer guide covers winterizer picks by grass type.
Shop math: 0.5 lb of nitrogen from common bags
The formula: pounds of product = pounds of N you want ÷ (first number ÷ 100). NC State's shortcut does the same thing for 0.5 lb: divide 50 by the first number on the bag.
| Bag | Math | Product per 1,000 sq ft | Also delivers (P2O5 / K2O) |
|---|---|---|---|
| 21-0-0 | 0.5 ÷ 0.21 = 2.38 | 2.4 lb (Arizona rounds to about 2½ lb) | 0 / 0 |
| 29-0-4 | 0.5 ÷ 0.29 = 1.72 | 1.7 lb | 0 / 0.07 lb |
| 16-4-8 | 0.5 ÷ 0.16 = 3.13 | 3.1 lb (Clemson rounds to 3 lb) | 0.13 lb / 0.25 lb |
| 46-0-0 (urea) | 0.5 ÷ 0.46 = 1.09 | 1.1 lb | 0 / 0 |
Now the whole lawn. Illustrative example: a 6,000 sq ft bermuda lawn overseeded with rye.
- Lawn size: 6,000 sq ft. That's 6 units of 1,000 sq ft.
- Target: 0.5 lb N per 1,000 sq ft (Clemson).
- 21-0-0: 2.38 lb × 6 = 14.3 lb per feeding.
- 16-4-8: 3.13 lb × 6 = 18.8 lb per feeding.
- Clemson's two feedings with 21-0-0: 14.3 × 2 = 28.6 lb for the winter.
Check the heavier programs the same way. LSU's parish rates are per 1,000 sq ft. 2 lb of urea is 0.92 lb of N. 3 lb of 33-0-0 is 0.99 lb. 6 lb of 13-13-13 is 0.78 lb. Arizona's first feeding, 5 lb of 16-20-0, is 0.8 lb of N plus 1 lb of phosphate. All near the top of the range.
Don't know your square footage? The lawn size calculator measures it from satellite. The fertilizer calculator runs the math for any bag. The bag's spreader setting was written for somebody else's spreader, so check yours against the spreader settings chart.
Start after the second mowing
Clemson and UF both wait for the second mowing. UF says the wait helps prevent root burn. Arizona waits two weeks after the seedlings come up. LSU's parish article feeds at emergence, about a week after seeding. NC State's field calendar says start shortly after emergence, and never while overseeding. I'd wait for the second mowing. It's the date most sources agree on, and a mower tells you the rye is rooted.
The fall bermuda feeding matters too. NC State caps it at 0.5 lb N, in September or four weeks before first frost. That limits spring dead spot. LSU says nitrogen on dormant warm-season grass can lead to more brown patch and winterkill.
Skip feedings on frozen ground
NC State's Nash County office is plain about it: don't fertilize frozen ground or dormant turf. The fertilizer isn't absorbed and is more likely to wash off in runoff or wind. NC State's field calendar says keep feeding rye until cold weather halts its growth.
So check the rye before you load the spreader. Green, growing and due for a mow? Feed it. Frozen, or stalled in a cold spell? Wait for the thaw. LSU's parish office gives the signal. About six weeks after a feeding, rye runs low on nitrogen and turns yellow.
Stop early so the bermuda comes back
Late nitrogen keeps rye strong into spring. Strong rye shades and crowds the waking bermuda. Each home-lawn source here sets a stop point.
- South Carolina: no fertilizer after mid to late January. Keep the lawn on the dry side, without letting the bermuda suffer. Mow the rye down to 1 inch in spring, without scalping the bermuda. (Clemson)
- Florida: none after February in South Florida, none after March in North Florida. Water as little as the permanent grass allows, and mow the rye close each week. (UF/IFAS)
- Louisiana: don't push growth with fertilizer as warm-season grass greens up. That's late February in the south, early to mid-March in the north. Perennial rye can hang on through May. (LSU AgCenter)
- Low desert Arizona: monthly feedings through March. Bermuda wakes when nights stay above 60°F for seven nights, usually April to May. Then feed 0.25 lb N weekly to push the bermuda. (Arizona AZ1683, AZ1817)
Sources split on spring nitrogen. Home-lawn sources in the Southeast wait until the bermuda is fully green. NC State's field calendar says avoid fertilizer while the bermuda turns green. Texas A&M's field guide goes the other way. It puts 1 to 1.5 lb N down at bermuda green-up to help the bermuda over annual rye. Arizona's weekly 0.25 lb does the same in the desert. On a home lawn in the Southeast, skip the spring push unless you follow Arizona's desert program.
When is the bermuda awake? UGA says no nitrogen until 4-inch soil holds at 65°F and rising. Check yours with the soil temperature tool, and see when bermuda green-up starts.
Annual vs perennial ryegrass: same feed, different exit
None of the sources here give separate winter rates for annual and perennial rye. Same bag. Same 0.5 lb.
The exit is different. Clemson says annual rye dies out faster in spring. Perennial rye can last into early summer, especially in shade. Some survives for years. Texas A&M says annual rye usually transitions on its own, while perennial rye can be hard to get out. With perennial rye, hold the stop date.
More on choosing and seeding rye is in overseeding with ryegrass for winter.
Zoysia and other grasses
Clemson says overseed bermudagrass only. It says the extra water, fertilizer and shade from rye can severely set back or damage centipede, zoysia and St. Augustine. Arizona says zoysia and St. Augustine are generally not suited to overseeding. UGA lists zoysia with bermuda as grasses rye can cover in winter. It also warns the rye can damage the base grass unless the spring is managed well.
Rye already on zoysia? Stay at the light end: 0.5 lb, two feedings, and Clemson's January stop.
- Rates here are general ranges from Clemson, UF/IFAS, LSU AgCenter, NC State, Texas A&M and Arizona. Your county Extension office knows your local stop date.
- A soil test from your state lab tells you whether you need phosphorus, potassium or lime.
- Follow the fertilizer label and any state or local fertilizer rules.
What other guides get wrong
They feed at seeding without saying who it's for. Texas A&M's sports-field guide puts 0.5 lb N down at overseeding, and LSU feeds at emergence. NC State's athletic field calendar warns that fertilizing while you overseed can push the bermuda to compete with the young rye. Clemson and UF, both writing for home lawns, wait for the second mowing. On a home lawn, wait.
They feed into spring for color. Late feedings keep the rye in charge. Clemson stops in January. UF stops in February or March. LSU warns against pushing growth at green-up.
They treat a starter bag as the default. Phosphorus has a place in the first feeding on some programs. After that, the soil test decides.
The winter rye punch list
- Confirm the base grass is bermuda. Use the photo grass ID tool if you're not sure.
- Last bermuda feeding: 0.5 lb N or less, in September or four weeks before first frost.
- Seed. No fertilizer yet.
- After the second mowing: 0.5 lb N per 1,000 sq ft. That's 2.4 lb of 21-0-0 or 3.1 lb of 16-4-8.
- Rye turning pale a month or two later? Feed 0.5 lb again. Skip frozen ground. South Carolina stops at two feedings. Low desert: keep feeding 0.5 lb monthly through March.
- Stop on your region's date. South Carolina: mid to late January. South Florida: end of February. North Florida and the low desert: end of March.
- Southeast: feed the bermuda again several weeks after it's fully green, once 4-inch soil holds at 65°F. Low desert: once nights stay above 60°F, feed 0.25 lb N weekly to push the bermuda.
Free Lawn Care Tools
A high-nitrogen fertilizer with little or no phosphorus suits overseeded ryegrass in winter, such as 21-0-0, urea, or a 16-4-8 or 15-0-15 blend. Clemson Extension names 16-4-8 and 15-0-15, and LSU AgCenter switches to nitrogen-only products after the first feeding. Add phosphorus only when a soil test shows the soil is low.
Southeast home-lawn sources call for light feedings spaced about a month or two apart. Clemson feeds once after the second mowing and once more in midwinter if needed, UF/IFAS feeds a second time about 60 days after the first, and LSU AgCenter allows a feeding every four to six weeks. Feed again when the rye turns pale and is still growing.
Divide 0.5 by the first number on the bag written as a decimal. That works out to about 2.4 lb of 21-0-0, 1.7 lb of 29-0-4, 3.1 lb of 16-4-8 or 1.1 lb of urea per 1,000 sq ft. NC State's shortcut gives the same answer: divide 50 by the first number.
Stop early enough that the bermuda can take the lawn back. Clemson says no fertilizer after mid to late January in South Carolina, and UF/IFAS says none after February in South Florida or after March in North Florida. Wait to feed the bermuda until several weeks after it is fully green, per NC State.
No Extension source reviewed here gives separate winter rates, so both get the same light nitrogen program. The difference is the spring exit. Perennial ryegrass can last into early summer, especially in shade, so a firm stop date matters more with it.
Skip fertilizer while the ground is frozen. NC State Extension says fertilizer on frozen ground is not absorbed and is more likely to wash off in runoff or wind. Wait until the ground thaws and the rye is green and growing again.
Sources (14)
- Clemson Cooperative Extension HGIC 1206, Overseeding With Ryegrass (updated September 2024): bermuda only, 0.5 lb N after the second mowing, midwinter feeding, 3 lb of 16-4-8 or 15-0-15, January stop, Pythium, annual vs perennial.
- UF/IFAS EDIS ENH14, Overseeding Florida Lawns for Winter Color (archival copy, revised December 2010): first feeding after the second mowing, up to 1 lb N, second feeding about 60 days later, no fertilizer after February or March.
- LSU AgCenter, Be careful with late fall and winter lawn care (2009): 0.5 to 1 lb N every four to six weeks on overseeded lawns, no fertilizer push at green-up.
- LSU AgCenter Livingston Parish, Winter Grass (2017): feeding at emergence, nitrogen-only follow-up about six weeks later.
- University of Arizona AZ1817, Turfgrass Maintenance Guide for the Low Elevation Arizona Desert (2020): 0.5 lb N monthly October through March, 21-0-0 at about 2½ lb.
- University of Arizona AZ1683, Overseeding Winter Grasses into Bermudagrass Turf (2015): stop bermuda nitrogen 30 days before, 16-20-0 two weeks after emergence, spring transition.
- University of Arizona Turf Tips, November 1997 (Kopec): N-P-K ratios and nitrogen forms for November.
- NC State Extension, Bermudagrass Lawn Maintenance Calendar: fall cap, spring timing, divide-50 shortcut.
- NC State Extension, Bermudagrass Athletic Field Maintenance Calendar: overseeded field rates and spring transition.
- NC State Extension Nash County, Caring for Your Lawns and the Environment (2025): frozen ground, soil testing.
- Texas A&M AgriLife Extension, The Need to Overseed: sports field rates, spring nitrogen at green-up, annual vs perennial transition.
- UGA Extension, Bermudagrass Lawn Calendar (2019): 65°F soil rule for spring nitrogen.
- UGA Extension B1533-1, Lawns in Georgia: Selection and Species (2020): rye over bermuda and zoysia.
- Mississippi State Extension Turf Tips, Winter overseeding a permanent warm-season lawn (2009): seeding timing.
Photos: Gilba Solutions Pty Ltd / Wikimedia Commons. Resized and cropped · CC BY-SA 4.0
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