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Great Falls, MT planting calendar

When to plant vegetables in Great Falls, MT (USDA hardiness zone 4b). Typical last spring frost around May 6, 2026 10 days year to year), first fall frost around Oct 1, 202611 days).

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

Want exact dates for your address, a drag-and-drop bed layout, and reminders when it’s time to sow? Enter your ZIP:

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Still time to plant

As of today, these crops can still reach harvest before Great Falls, MT’s first frost (~Oct 1, 2026) — fastest first.

Month by month in Great Falls, MT

January

February

March

April

May

June

July

August

Understand your frost dates

Frost dates are NOAA 1991–2020 climate normals for a representative location in Great Falls, MT (covering 3 ZIPs); your exact dates depend on your address. Schedules are guidance, not guarantees.