When to fertilize a tall fescue lawn
Tall fescue is a cool-season grass, so most of its yearly feeding belongs in fall — typically early September and again in October or November. A light spring feeding is optional; heavy summer feeding is usually discouraged.
Why fall comes first
Cool-season grass grows roots and recovers best as temperatures fall. Fall feeding supports that growth without pushing tender top growth into summer heat.
Spring and summer
If you feed in spring, keep it light and late enough that the grass is actively growing. Avoid fertilizing during heat stress or drought, when the lawn cannot use it well.
Weather to wait for
Skip feeding right before heavy rain, which can wash product off the lawn. A light rain or about ¼ inch of watering afterward helps many granular products. Always follow the product label.
Use a soil test
A soil test from your local extension service tells you what your lawn actually needs, including lime or phosphorus. It is more reliable than any general schedule, including ours.
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Rescue my lawnEducational guidance only. Local rules and product labels control; a soil test is more reliable than general advice.