Michigan Frost Dates & Growing Zones by City
Detroit is our only Michigan city with frost dates so far: typical (50%) last spring frost Apr 27, typical frost-free season 181 days.
By the 2023 USDA hardiness map, these cities are in zone 6b.
We take each city's dates from the nearest NOAA station that passes our quality rules (methodology).
| City | Last frost (50%) | First frost (50%) | Season (days, 50%) | Zone 2023 | Confidence | Planting calendar |
|---|---|---|---|---|---|---|
| Detroit frost dates | Apr 27 | Oct 25 | 181 | 6b | Medium | Detroit planting calendar |
Station match, data and rules: methodology. Long-term odds, not a forecast.