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Planting calendar for ZIP 59871 (Sula, MT)

When to plant vegetables in Sula, MT (USDA hardiness zone 5a). Typical last spring frost around May 24, 2026 15 days year to year), first fall frost around Sep 23, 202613 days).

Playing it safe? Spring frost holds off until about Jun 12, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Sula, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59871: NOAA 1991-2020 normals (USC00242221 DARBY, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.