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Planting calendar for ZIP 59024 (Custer, MT)

When to plant vegetables in Custer, MT (USDA hardiness zone 4b). Typical last spring frost around May 22, 2026 11 days year to year), first fall frost around Sep 22, 202611 days).

Playing it safe? Spring frost holds off until about Jun 5, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Custer, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59024: NOAA 1991-2020 normals (USC00246647 POMPEYS PILLAR 15N, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.