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Planting calendar for ZIP 59003 (Ashland, MT)

When to plant vegetables in Ashland, MT (USDA hardiness zone 4b). Typical last spring frost around May 25, 2026 10 days year to year), first fall frost around Sep 19, 202612 days).

Playing it safe? Spring frost holds off until about Jun 6, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Ashland, MT

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 59003: NOAA 1991-2020 normals (USC00247740 SONNETTE 7 SW, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.