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Planting calendar for ZIP 57239 (Grenville, SD)

When to plant vegetables in Grenville, SD (USDA hardiness zone 4b). Typical last spring frost around May 1, 2026 10 days year to year), first fall frost around Oct 12, 202610 days).

Playing it safe? Spring frost holds off until about May 13, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Grenville, SD planting calendar for dates typical of the whole city.

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Month by month in Grenville, SD

January

February

March

April

May

August

Understand your frost dates

Frost dates for ZIP 57239: NOAA 1991-2020 normals (USC00398980 WAUBAY NATL WILD LIFE, SD US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.