Wisconsin Frost Dates & Growing Zones by City
Milwaukee is our only Wisconsin city with frost dates so far: typical (50%) last spring frost Apr 26, typical frost-free season 173 days.
On the 2023 USDA hardiness map, these cities fall in zones 5b and 6a.
Dates come from the nearest NOAA station to each city that meets our quality rules, as the methodology explains.
| City | Last frost (50%) | First frost (50%) | Season (days, 50%) | Zone 2023 | Confidence | Planting calendar |
|---|---|---|---|---|---|---|
| Milwaukee frost dates | Apr 26 | Oct 18 | 173 | 5b–6a | High | Milwaukee planting calendar |
Station match, data and rules: methodology. Long-term odds, not a forecast.