Bield:Farm
Frost dates · Wisconsin

Wisconsin frost dates,
county by county.

Last spring frost and first fall frost probability data for all 72 counties in Wisconsin, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.

Variation across Wisconsin

36 days separate the earliest and latest counties.

The median last spring frost in Milwaukee County is April 9 36 days earlier than Rusk County at May 15. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.

By frost timing

Counties sorted by last spring frost.

Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.