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Planting calendar for ZIP 49801 (Iron Mountain, MI)

When to plant vegetables in Iron Mountain, MI (USDA hardiness zone 4b). Typical last spring frost around May 25, 2026 11 days year to year), first fall frost around Sep 24, 202611 days).

Playing it safe? Spring frost holds off until about Jun 8, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Iron Mountain, MI planting calendar for dates typical of the whole city.

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Month by month in Iron Mountain, MI

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 49801: NOAA 1991-2020 normals (USW00094893 IRON MTN FORD AP, MI US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.