Frost dates in Herndon, VA
The average last spring frost in Herndon is around April 20 and the first fall frost is around October 18. That gives Herndon an average growing season of about 181 days.
Last spring frost
| Early (10% chance after) | April 6 |
|---|---|
| Average (50%) | April 20 |
| Late (90%) | May 10 |
First fall frost
| Early (10%) | October 4 |
|---|---|
| Average (50%) | October 18 |
| Late (90% chance before) | November 4 |