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Planting calendar for ZIP 57346 (Stephan, SD)

When to plant vegetables in Stephan, SD (USDA hardiness zone 4b). Typical last spring frost around May 10, 2026 10 days year to year), first fall frost around Sep 29, 202610 days).

Playing it safe? Spring frost holds off until about May 22, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Stephan, SD

January

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 57346: NOAA 1991-2020 normals (USC00397992 STEPHAN 2 NW, SD US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.