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Planting calendar for ZIP 03820 (Dover, NH)

When to plant vegetables in Dover, NH (USDA hardiness zone 6a). Typical last spring frost around May 3, 2026 9 days year to year), first fall frost around Oct 10, 202611 days).

Playing it safe? Spring frost holds off until about May 14, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Dover, NH planting calendar for dates typical of the whole city.

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Month by month in Dover, NH

January

February

March

April

May

July

August

Understand your frost dates

Frost dates for ZIP 03820: NOAA 1991-2020 normals (USW00054794 DURHAM 2 N, NH US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.