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Planting calendar for ZIP 59012 (Birney, MT)

When to plant vegetables in Birney, MT (USDA hardiness zone 4b). Typical last spring frost around May 23, 2026 10 days year to year), first fall frost around Sep 15, 202612 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 Birney, MT planting calendar for dates typical of the whole city.

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Month by month in Birney, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59012: NOAA 1991-2020 normals (USC00241297 BUSBY, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.