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Planting calendar for ZIP 57473 (Seneca, SD)

When to plant vegetables in Seneca, SD (USDA hardiness zone 4b). Typical last spring frost around May 14, 2026 10 days year to year), first fall frost around Sep 29, 202610 days).

Playing it safe? Spring frost holds off until about May 26, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Seneca, SD

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 57473: NOAA 1991-2020 normals (USC00393838 HIGHMORE 23 N, SD US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.