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Planting calendar for ZIP 49953 (Ontonagon, MI)

When to plant vegetables in Ontonagon, MI (USDA hardiness zone 5a). Typical last spring frost around May 27, 2026 14 days year to year), first fall frost around Oct 1, 202613 days).

Playing it safe? Spring frost holds off until about Jun 13, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Ontonagon, MI

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 49953: NOAA 1991-2020 normals (USC00206220 ONTONAGON 6 SE, MI US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.