Last frost date in Ann Arbor, Michigan
May 5
Average last frost in spring. In an early year (1 in 10) it's over by April 21; in a late year (1 in 10) it comes after May 20.
October 10
Average first frost in fall. 1 year in 10 it comes by September 28.
Source: NOAA U.S. Climate Normals 1991–2020, station Ann Arbor SE (USC00200228), 3.1 miles from Ann Arbor, elevation 832 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Ypsilanti, so its frost dates are the same as Ann Arbor's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 21 | May 5 | May 20 |
| First frost in fall | Sept 28 | Oct 10 | Oct 24 |
Frost-free days in an average year: 157
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 15 | Oct 1 |
| Frost (32°F) | Every year | May 5 | Oct 10 |
| Hard freeze (28°F) | Every year | Apr 24 | Oct 23 |
Nights at 32°F or colder in an average year: 147
What to plant now in Ann Arbor
- Spring planting calendar for an average last frost around April 30 Ann Arbor: May 5
- Fall planting calendar for an average first frost around October 10 Ann Arbor: October 10
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Michigan
- South Lyon 13 mi · last frost May 5
- Westland 18 mi · last frost Apr 20
- Wixom 20 mi · last frost May 6
- Livonia 20 mi · last frost May 1
- Flat Rock 27 mi · last frost Apr 27
Updated