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Planting calendar for ZIP 54529 (Harshaw, WI)

When to plant vegetables in Harshaw, WI (USDA hardiness zone 4a). Typical last spring frost around May 13, 2026 11 days year to year), first fall frost around Oct 3, 202612 days).

Playing it safe? Spring frost holds off until about May 27, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Harshaw, WI

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June

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August

Understand your frost dates

Frost dates for ZIP 54529: NOAA 1991-2020 normals (USC00479236 WILLOW RSVR, WI US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.