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Planting calendar for ZIP 59333 (Hathaway, MT)

When to plant vegetables in Hathaway, MT (USDA hardiness zone 4a). Typical last spring frost around May 8, 2026 10 days year to year), first fall frost around Sep 30, 202611 days).

Playing it safe? Spring frost holds off until about May 20, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Hathaway, MT

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August

Understand your frost dates

Frost dates for ZIP 59333: NOAA 1991-2020 normals (USW00024037 MILES CITY F WILEY FLD, MT US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.