When to… — Every Lawn Timing Question

Seven jobs where the calendar matters more than the technique. Each links to state-by-state dates drawn from NOAA 1991–2020 climate records.

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When to Overseed

Thicken a thin lawn by seeding into existing turf.

 ⛳

When to Aerate

Pull soil cores to relieve compaction — timed to peak growth.

 🛡️

When to Apply Pre-Emergent

Stop crabgrass before it germinates — the most timing-sensitive job of the year.

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When to Fertilize

Feed when the grass can use it — fall for cool-season, summer for warm.

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When to Dethatch

Rake out the spongy layer — only when it exceeds ~½ inch.

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When to Stop Mowing

The last cut of the year comes with the first frost.

 ❄️

When to Winterize

The season’s last feeding — nitrogen up north, potassium down south.

Why timing beats technique

Most lawn jobs fail on the calendar, not in the execution. Pre-emergent that goes down a week after crabgrass germinates does nothing; seed sown into summer heat cooks; nitrogen applied as a northern lawn shuts down feeds disease instead of roots. And the right week for each of these is a local fact — driven by when your soil warms in spring and your first frost lands in fall, which NOAA has measured for decades. Pick a task above, then your state; or start from your ZIP code or your city's full calendar.

Jump to your state's full calendar

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