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Planting calendar for ZIP 59483 (Sun River, MT)

When to plant vegetables in Sun River, MT (USDA hardiness zone 4a). Typical last spring frost around Jun 2, 2026 13 days year to year), first fall frost around Sep 10, 202612 days).

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

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

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Month by month in Sun River, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59483: NOAA 1991-2020 normals (USC00248021 SUN RVR 4 S, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.