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Planting calendar for ZIP 59925 (Marion, MT)

When to plant vegetables in Marion, MT (USDA hardiness zone 4b). Typical last spring frost around May 31, 2026 16 days year to year), first fall frost around Sep 10, 202612 days).

Playing it safe? Spring frost holds off until about Jun 20, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Marion, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59925: NOAA 1991-2020 normals (USC00244558 KALISPELL GLACIER AP, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.