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Planting calendar for ZIP 59314 (Biddle, MT)

When to plant vegetables in Biddle, MT (USDA hardiness zone 4b). Typical last spring frost around May 14, 2026 10 days year to year), first fall frost around Sep 28, 202611 days).

Playing it safe? Spring frost holds off until about May 26, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Biddle, MT

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 59314: NOAA 1991-2020 normals (USC00240743 BIDDLE 8 SW, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.