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Planting calendar for ZIP 59643 (Toston, MT)

When to plant vegetables in Toston, MT (USDA hardiness zone 5a). Typical last spring frost around May 19, 2026 10 days year to year), first fall frost around Sep 19, 202611 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 Toston, MT planting calendar for dates typical of the whole city.

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Month by month in Toston, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59643: NOAA 1991-2020 normals (USC00248324 TOWNSEND 3SE, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.