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Planting calendar for ZIP 48625 (Harrison, MI)

When to plant vegetables in Harrison, MI (USDA hardiness zone 5a). Typical last spring frost around May 30, 2026 15 days year to year), first fall frost around Sep 15, 202614 days).

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

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

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Month by month in Harrison, MI

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 48625: NOAA 1991-2020 normals (USC00203932 HOUGHTON LAKE 6 WSW, MI US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.