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Planting calendar for ZIP 59078 (Shawmut, MT)

When to plant vegetables in Shawmut, MT (USDA hardiness zone 4b). Typical last spring frost around May 26, 2026 13 days year to year), first fall frost around Sep 18, 202612 days).

Playing it safe? Spring frost holds off until about Jun 11, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Shawmut, MT planting calendar for dates typical of the whole city.

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Month by month in Shawmut, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59078: NOAA 1991-2020 normals (USC00247263 RYEGATE 18 NNW, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.