District of Columbia frost dates
Across 3 weather stations in District of Columbia, the median last spring frost runs from Mar 24 in Washington Reagan Airport to Apr 9 in Dalecarlia Reservoir, and the first fall frost from Oct 31 to Nov 18.
District of Columbia at a glance
- Weather stations
- 3
- Earliest last frost
- Mar 24 Washington Reagan Airport
- Latest last frost
- Apr 9 Dalecarlia Reservoir
- Longest season
- 241 days Washington Reagan Airport
- Typical season
- about 224 frost-free days
- Hardiness zones
- Zones 7b to 8a
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Dalecarlia Reservoir | Apr 9 | Oct 31 | 202 | 7b |
| National Arboretum DC | Mar 29 | Nov 8 | 224 | 8a |
| Washington Reagan Airport | Mar 24 | Nov 18 | 241 | 8a |
Median dates from NOAA 1991–2020 climate normals. How to read them.