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Planting calendar for ZIP 58655 (South Heart, ND)

When to plant vegetables in South Heart, ND (USDA hardiness zone 4b). Typical last spring frost around May 18, 2026 10 days year to year), first fall frost around Sep 25, 202610 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 South Heart, ND planting calendar for dates typical of the whole city.

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Month by month in South Heart, ND

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 58655: NOAA 1991-2020 normals (USW00024012 THEODORE ROOSEVELT AP, ND US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.