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Planting calendar for ZIP 54512 (Boulder Junction, WI)

When to plant vegetables in Boulder Junction, WI (USDA hardiness zone 4a). Typical last spring frost around May 25, 2026 13 days year to year), first fall frost around Sep 21, 202613 days).

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

See the full Boulder Junction, WI planting calendar for dates typical of the whole city.

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Month by month in Boulder Junction, WI

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 54512: NOAA 1991-2020 normals (USC00477092 REST LAKE, WI US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.