Wisconsin Hardiness Zones

Wisconsin covers USDA plant hardiness zones 4a to 6a on the 2023 map, so its coldest areas average −30 to −25 °F on the coldest winter night. Find your zone by ZIP code, or pick a city below for its zone, sunrise and daylight by month.

Wisconsin hardiness zone map

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This is not the official USDA Plant Hardiness Zone Map. Zones are derived from the official 2023 dataset, resampled to about 2 km. Dots mark cities with their own page.

Source: USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture, planthardiness.ars.usda.gov. Underlying data © PRISM Group, Oregon State University, prism.oregonstate.edu, accessed 2026-08-30.

Zones and daylight by city

City	Zone	Coldest night	Longest day	Shortest day
Milwaukee	6a	−10 to −5 °F	15h 22m	9h 00m
Madison	5a	−20 to −15 °F	15h 22m	9h 00m
Green Bay	5b	−15 to −10 °F	15h 33m	8h 49m
Kenosha	5b	−15 to −10 °F	15h 19m	9h 03m
Racine	6a	−10 to −5 °F	15h 20m	9h 02m
Appleton	5b	−15 to −10 °F	15h 31m	8h 51m
Eau Claire	4b	−25 to −20 °F	15h 36m	8h 47m
La Crosse	5a	−20 to −15 °F	15h 28m	8h 54m

Gardening in Wisconsin?

Your zone says what survives winter. Deconstruct Sun measures how many hours of direct sun your exact spot gets, so you can pick plants that thrive. Free on iPhone.

Questions

What hardiness zones are in Wisconsin?

Wisconsin spans USDA zones 4a to 6a on the 2023 map. Among its larger cities, Eau Claire is coldest (zone 4b) and Milwaukee is warmest (zone 6a).

How do I find my exact zone in Wisconsin?

Enter your ZIP code in the hardiness zone lookup on this site. It reads the 2023 USDA data for that ZIP and warns you if you are near a zone boundary.

How much sun do gardens in Wisconsin get?

In Milwaukee, an open spot gets up to 15.4 hours of daylight in June but only 9.0 in December. Trees and buildings cut that down, especially in winter. The Deconstruct Sun app measures the real direct-sun hours for one exact spot.