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Planting calendar for ZIP 59058 (Mosby, MT)

When to plant vegetables in Mosby, MT (USDA hardiness zone 4b). Typical last spring frost around May 5, 2026 14 days year to year), first fall frost around Oct 4, 202611 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 Mosby, MT planting calendar for dates typical of the whole city.

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Month by month in Mosby, MT

January

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 59058: NOAA 1991-2020 normals (USC00245872 MOSBY 4 ENE, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.