Best Lawn Fertilizers: Ratios for Spring, Summer and Fall (2026)

N-P-K is the guaranteed analysis by weight: percent nitrogen (N), percent phosphate (P2O5) and percent potash (K2O). A 50 lb bag of 32-0-3 contains 16 lb of nitrogen, no phosphate and 1.5 lb of potash; the rest is carrier and other ingredients. Nitrogen drives color and growth, phosphorus supports root development in new grass, and potassium helps with stress tolerance when soil is deficient.

To find pounds of product for 1 lb of nitrogen per 1,000 sq ft, divide 100 by the nitrogen percentage. A 32-0-4 needs 3.1 lb; a 24-6-12 needs 4.2 lb; an 8-0-5 organic needs 12.5 lb. That number is the dose to compare against the label rate, not a replacement for it. The how to read a fertilizer label guide explains slow-release nitrogen, iron and the fine print.

Annual nitrogen depends on grass type, and more is not better. Extension services recommend splitting the yearly total into feedings of about 1 lb of nitrogen per 1,000 sq ft or less, with lower totals for unirrigated lawns, shade and grass clippings left on the lawn (clippings return nitrogen).

For cool-season lawns, fall is the main event: two feedings of mostly nitrogen, roughly 1 lb N per 1,000 sq ft each, in early fall and again late fall while the grass is still green. A fall product with extra potassium, such as Espoma Turf-Tone 8-0-5, is fine where a soil test shows low potassium. Spring feeding should be light, because heavy spring nitrogen pushes top growth that suffers in summer heat. Summer feeding of cool-season grass is mostly a mistake unless you use a slow-release, low-salt product like Milorganite.

For warm-season lawns, the calendar flips. Start after full green-up in late spring, then feed every six to eight weeks through summer with a high-nitrogen product; Lesco 32-0-3 lists bermuda in summer as a target use. Stop about six weeks before the first expected frost. Our zone 6 fall lawn care calendar and zone 8 summer calendar show region-specific timing.

Granular fertilizer is the better base for most homeowners. It is cheaper per pound of nitrogen, slow-release versions feed for weeks, and a spreader makes the rate easy to control. Liquid fertilizer greens up faster and suits spot feeding or small lawns, but it usually needs more frequent applications. The hose-end Scotts Turf Builder Liquid Lawn Food (29-0-3) is the lowest-effort way to feed a small yard with no spreader at all.

If you already own a tank or backpack sprayer for weed control, a liquid supplement can ride along, as long as both labels allow the mix. See liquid vs granular fertilizer and the best lawn sprayers.

Yes. A soil test tells you whether you need phosphorus or potassium at all, and whether low pH is locking nutrients up. Jonathan Green notes lawns do best between pH 6.2 and 7.0, and fertilizer is wasted when pH is far outside that. A university extension lab test is the gold standard for accuracy; a mail-in kit like MySoil is a convenient alternative. If your soil is acidic, lime before you spend money on fertilizer; the lime calculator and best soil test kits page cover the next steps.