Frost dates for Washington Reagan Airport, VA
At Washington Reagan Airport, the median last spring frost (32°F) is Mar 24 and the median first fall frost is Nov 18, for a typical growing season of 241 days. For a 90% chance that the last frost has passed, wait until Apr 6. Nearby ZIP codes are in USDA hardiness zones 7b to 8a.
- Mar 24Last spring frost (median)50% chance of 32°F after this date
- Apr 6Safer planting date10% chance of 32°F after this date
- Nov 18First fall frost (median)50% chance of 32°F by this date
- 241 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Mar 20 | Apr 3 | Apr 14 |
| 32°F | Mar 7 | Mar 24 | Apr 6 |
| 28°F | Feb 23 | Mar 12 | Mar 26 |
| 24°F | Feb 8 | Mar 2 | Mar 19 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 26 | Nov 6 | Nov 20 |
| 32°F | Nov 5 | Nov 18 | Dec 6 |
| 28°F | Nov 14 | Dec 3 | Dec 24 |
| 24°F | Dec 1 | Dec 22 | Jan 12 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 202 days | 216 days | 235 days |
| 32°F | 220 days | 241 days | 265 days |
| 28°F | 242 days | 268 days | 292 days |
| 24°F | 269 days | 293 days | 318 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 22202 | 8a | 10 to 15°F | 2 km |
| 20373 | 8a | 10 to 15°F | 2 km |
| 20032 | 8a | 10 to 15°F | 2 km |
| 20024 | 8a | 10 to 15°F | 3 km |
| 20319 | 8a | 10 to 15°F | 3 km |
| 22305 | 8a | 10 to 15°F | 3 km |
| 22301 | 8a | 10 to 15°F | 4 km |
| 22214 | 8a | 10 to 15°F | 4 km |
| 20260 | 8a | 10 to 15°F | 4 km |
| 20250 | 8a | 10 to 15°F | 4 km |
| 20388 | 8a | 10 to 15°F | 4 km |
| 20591 | 8a | 10 to 15°F | 4 km |
| 20204 | 8a | 10 to 15°F | 4 km |
| 22206 | 8a | 10 to 15°F | 5 km |
| 20560 | 8a | 10 to 15°F | 5 km |
| 22302 | 8a | 10 to 15°F | 5 km |
| 20565 | 8a | 10 to 15°F | 5 km |
| 20020 | 7b | 5 to 10°F | 5 km |
| 22211 | 8a | 10 to 15°F | 5 km |
| 22314 | 8a | 10 to 15°F | 5 km |
| 20408 | 8a | 10 to 15°F | 5 km |
| 20530 | 8a | 10 to 15°F | 5 km |
| 20551 | 8a | 10 to 15°F | 5 km |
| 20230 | 8a | 10 to 15°F | 5 km |
| 20418 | 8a | 10 to 15°F | 5 km |
| 20245 | 8a | 10 to 15°F | 5 km |
| 20240 | 8a | 10 to 15°F | 5 km |
| 20037 | 8a | 10 to 15°F | 5 km |
| 20415 | 8a | 10 to 15°F | 5 km |
| 20520 | 8a | 10 to 15°F | 5 km |
| 20045 | 8a | 10 to 15°F | 5 km |
| 20220 | 8a | 10 to 15°F | 5 km |
| 20566 | 8a | 10 to 15°F | 6 km |
| 20006 | 8a | 10 to 15°F | 6 km |
| 20431 | 8a | 10 to 15°F | 6 km |
| 20052 | 8a | 10 to 15°F | 6 km |
| 22204 | 7b | 5 to 10°F | 6 km |
| 20427 | 8a | 10 to 15°F | 6 km |
| 22303 | 8a | 10 to 15°F | 7 km |
| 22304 | 7b | 5 to 10°F | 8 km |
| 22311 | 7b | 5 to 10°F | 8 km |
| 22041 | 7b | 5 to 10°F | 9 km |
| 22310 | 7b | 5 to 10°F | 10 km |
| 22312 | 7b | 5 to 10°F | 11 km |
| 22150 | 7b | 5 to 10°F | 16 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USW00013743, at 38.8483, -77.0342, elevation 3 m (10 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 60.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Vienna (23 km)
- Washington DC Dulles Airport (39 km)
- WFO Sterling (42 km)
- Manassas (42 km)
- Quantico MCAS (45 km)
- Warrenton 3 SE (66 km)
- Purcellville (67 km)
- Fredericksburg Sewage (72 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.