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Janesville, WI planting calendar

When to plant vegetables in Janesville, WI (USDA hardiness zone 5b). Typical last spring frost around Apr 26, 2026 11 days year to year), first fall frost around Oct 15, 202610 days).

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

Want exact dates for your address, a drag-and-drop bed layout, and reminders when it’s time to sow? Enter your ZIP:

Or get a printable Janesville calendar and sowing reminders by email:

Still time to plant

As of today, these crops can still reach harvest before Janesville, WI’s first frost (~Oct 15, 2026) — fastest first.

Month by month in Janesville, WI

January

February

March

April

May

August

Understand your frost dates

Frost dates are NOAA 1991–2020 climate normals for a representative location in Janesville, WI (covering 3 ZIPs); your exact dates depend on your address. Schedules are guidance, not guarantees.