Frost dates for Warrenton 3 SE, VA
At Warrenton 3 SE, the median last spring frost (32°F) is Apr 9 and the median first fall frost is Nov 1, for a typical growing season of 205 days. For a 90% chance that the last frost has passed, wait until Apr 28. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 9Last spring frost (median)50% chance of 32°F after this date
- Apr 28Safer planting date10% chance of 32°F after this date
- Nov 1First fall frost (median)50% chance of 32°F by this date
- 205 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 | Apr 7 | Apr 22 | May 10 |
| 32°F | Mar 26 | Apr 9 | Apr 28 |
| 28°F | Mar 13 | Mar 29 | Apr 11 |
| 24°F | Feb 28 | Mar 17 | Mar 31 |
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 8 | Oct 21 | Nov 2 |
| 32°F | Oct 18 | Nov 1 | Nov 14 |
| 28°F | Nov 1 | Nov 14 | Dec 1 |
| 24°F | Nov 10 | Nov 27 | Dec 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 | 159 days | 182 days | 202 days |
| 32°F | 184 days | 205 days | 226 days |
| 28°F | 211 days | 229 days | 251 days |
| 24°F | 233 days | 254 days | 276 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 |
|---|---|---|---|
| 20187 | 7a | 0 to 5°F | 5 km |
| 20186 | 7a | 0 to 5°F | 6 km |
| 22724 | 7a | 0 to 5°F | 13 km |
| 22728 | 7a | 0 to 5°F | 14 km |
| 20119 | 7a | 0 to 5°F | 14 km |
| 22712 | 7a | 0 to 5°F | 14 km |
| 20137 | 7a | 0 to 5°F | 14 km |
| 22734 | 7a | 0 to 5°F | 17 km |
| 20115 | 7a | 0 to 5°F | 18 km |
| 20198 | 7a | 0 to 5°F | 23 km |
| 22720 | 7a | 0 to 5°F | 25 km |
| 22742 | 7a | 0 to 5°F | 25 km |
| 22718 | 7a | 0 to 5°F | 25 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 USC00448888, at 38.6811, -77.7678, elevation 152 m (500 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 98.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Manassas (25 km)
- Boston 4 SE (32 km)
- Washington DC Dulles Airport (39 km)
- Sperryville (40 km)
- WFO Sterling (41 km)
- Front Royal (44 km)
- Mount Wx (44 km)
- Mount Wx 3 (44 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.