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Planting calendar for ZIP 59032 (Grass Range, MT)

When to plant vegetables in Grass Range, MT (USDA hardiness zone 4b). Typical last spring frost around May 20, 2026 12 days year to year), first fall frost around Sep 24, 20269 days).

Playing it safe? Spring frost holds off until about Jun 4, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Grass Range, MT

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 59032: NOAA 1991-2020 normals (USC00243727 GRASS RANGE, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.