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Planting calendar for ZIP 59316 (Boyes, MT)

When to plant vegetables in Boyes, MT (USDA hardiness zone 4b). Typical last spring frost around May 17, 2026 11 days year to year), first fall frost around Sep 22, 202612 days).

Playing it safe? Spring frost holds off until about May 31, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Boyes, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59316: NOAA 1991-2020 normals (USC00247034 RIDGEWAY 1 S, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.