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Planting calendar for ZIP 59420 (Carter, MT)

When to plant vegetables in Carter, MT (USDA hardiness zone 4a). Typical last spring frost around May 23, 2026 12 days year to year), first fall frost around Sep 23, 202610 days).

Playing it safe? Spring frost holds off until about Jun 7, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Carter, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59420: NOAA 1991-2020 normals (USC00241525 CARTER 14 W, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.