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Planting calendar for ZIP 58205 (Grand Forks Afb, ND)

When to plant vegetables in Grand Forks Afb, ND (USDA hardiness zone 4a). Typical last spring frost around May 16, 2026 11 days year to year), first fall frost around Sep 27, 20269 days).

Playing it safe? Spring frost holds off until about May 30, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Grand Forks Afb, ND planting calendar for dates typical of the whole city.

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Month by month in Grand Forks Afb, ND

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 58205: NOAA 1991-2020 normals (USW00014916 GRAND FORKS INTL AP, ND US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.