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Planting calendar for ZIP 63304 (Saint Charles, MO)

When to plant vegetables in Saint Charles, MO (USDA hardiness zone 6b). Typical last spring frost around Apr 10, 2026 12 days year to year), first fall frost around Oct 26, 202611 days).

Playing it safe? Spring frost holds off until about Apr 25, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Saint Charles, MO planting calendar for dates typical of the whole city.

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Month by month in Saint Charles, MO

January

February

March

April

May

August

Understand your frost dates

Frost dates for ZIP 63304: NOAA 1991-2020 normals (USC00238805 WELDON SPRING NWS, MO US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.