Frost dates in Ann Arbor, MI
The average last spring frost in Ann Arbor is around May 5 and the first fall frost is around October 15. That gives Ann Arbor an average growing season of about 163 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 5 |
| Late (90%) | May 18 |
First fall frost
| Early (10%) | October 2 |
|---|---|
| Average (50%) | October 15 |
| Late (90% chance before) | October 24 |