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Planting calendar for ZIP 59002 (Acton, MT)

When to plant vegetables in Acton, MT (USDA hardiness zone 5a). Typical last spring frost around May 4, 2026 11 days year to year), first fall frost around Oct 7, 202610 days).

Playing it safe? Spring frost holds off until about May 18, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Acton, MT

January

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 59002: NOAA 1991-2020 normals (USW00024033 BILLINGS LOGAN INTL AP, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.