Frost dates in Rockville, MD
The average last spring frost in Rockville is around April 15 and the first fall frost is around October 28. That gives Rockville an average growing season of about 196 days.
Last spring frost
| Early (10% chance after) | March 26 |
|---|---|
| Average (50%) | April 15 |
| Late (90%) | May 9 |
First fall frost
| Early (10%) | October 5 |
|---|---|
| Average (50%) | October 28 |
| Late (90% chance before) | November 6 |