Frost dates for Manassas, VA
At Manassas, the median last spring frost (32°F) is Apr 12 and the median first fall frost is Oct 27, for a typical growing season of 197 days. For a 90% chance that the last frost has passed, wait until Apr 24. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 12Last spring frost (median)50% chance of 32°F after this date
- Apr 24Safer planting date10% chance of 32°F after this date
- Oct 27First fall frost (median)50% chance of 32°F by this date
- 197 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 11 | Apr 24 | May 10 |
| 32°F | Mar 30 | Apr 12 | Apr 24 |
| 28°F | Mar 17 | Apr 1 | Apr 14 |
| 24°F | Mar 2 | Mar 20 | Apr 4 |
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 6 | Oct 18 | Oct 30 |
| 32°F | Oct 13 | Oct 27 | Nov 7 |
| 28°F | Oct 24 | Nov 5 | Nov 19 |
| 24°F | Nov 2 | Nov 16 | Dec 4 |
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 | 157 days | 177 days | 194 days |
| 32°F | 180 days | 197 days | 216 days |
| 28°F | 200 days | 218 days | 239 days |
| 24°F | 221 days | 242 days | 267 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 |
|---|---|---|---|
| 20110 | 7a | 0 to 5°F | 1 km |
| 20136 | 7a | 0 to 5°F | 4 km |
| 20111 | 7a | 0 to 5°F | 6 km |
| 20109 | 7a | 0 to 5°F | 8 km |
| 20181 | 7a | 0 to 5°F | 9 km |
| 20112 | 7a | 0 to 5°F | 9 km |
| 20121 | 7a | 0 to 5°F | 9 km |
| 20124 | 7b | 5 to 10°F | 10 km |
| 20155 | 7a | 0 to 5°F | 14 km |
| 22039 | 7b | 5 to 10°F | 16 km |
| 22193 | 7b | 5 to 10°F | 16 km |
| 22192 | 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 USC00445204, at 38.7333, -77.4925, elevation 75 m (245 ft).
- Data quality: Estimated from nearby stations (2+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 94.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Washington DC Dulles Airport (23 km)
- Warrenton 3 SE (25 km)
- Vienna (25 km)
- WFO Sterling (27 km)
- Quantico MCAS (31 km)
- Washington Reagan Airport (42 km)
- Purcellville (49 km)
- Fredericksburg Sewage (50 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.