Last frost date in South Lyon, Michigan
May 5
Average last frost in spring. In an early year (1 in 10) it's over by April 22; in a late year (1 in 10) it comes after May 21.
October 13
Average first frost in fall. 1 year in 10 it comes by September 30.
Source: NOAA U.S. Climate Normals 1991–2020, station Whitmore Lake 1NW (USC00208972), 6.9 miles from South Lyon, elevation 906 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 22 | May 5 | May 21 |
| First frost in fall | Sept 30 | Oct 13 | Oct 26 |
Frost-free days in an average year: 160
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 17 | Oct 1 |
| Frost (32°F) | Every year | May 5 | Oct 13 |
| Hard freeze (28°F) | Every year | Apr 26 | Oct 26 |
Nights at 32°F or colder in an average year: 152
What to plant now in South Lyon
- Spring planting calendar for an average last frost around April 30 South Lyon: May 5
- Fall planting calendar for an average first frost around October 10 South Lyon: October 13
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.