Frost dates in Waltham, MA
The average last spring frost in Waltham is around May 2 and the first fall frost is around October 8. That gives Waltham an average growing season of about 159 days.
Last spring frost
| Early (10% chance after) | April 18 |
|---|---|
| Average (50%) | May 2 |
| Late (90%) | May 18 |
First fall frost
| Early (10%) | September 24 |
|---|---|
| Average (50%) | October 8 |
| Late (90% chance before) | October 21 |