spring4 min read
Best Time to Fertilize Lawn? September Is #1 (2026)
Fall (September) is the #1 fertilizing window for cool-season grass; late spring-summer for warm-season. Soil temp — not air temp — decides timing.
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Fall (September) is the #1 fertilizing window for cool-season grass; late spring-summer for warm-season. Soil temp — not air temp — decides timing.