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Planting calendar for ZIP 55605 (Grand Portage, MN)

When to plant vegetables in Grand Portage, MN (USDA hardiness zone 4b). Typical last spring frost around May 24, 2026 11 days year to year), first fall frost around Sep 29, 20269 days).

Playing it safe? Spring frost holds off until about Jun 7, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Grand Portage, MN planting calendar for dates typical of the whole city.

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Month by month in Grand Portage, MN

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 55605: NOAA 1991-2020 normals (USC00213296 GRAND PORTAGE, MN US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.