Frost dates for Vienna, MD
At Vienna, the median last spring frost (32°F) is Apr 8 and the median first fall frost is Nov 4, for a typical growing season of 209 days. For a 90% chance that the last frost has passed, wait until Apr 23. Nearby ZIP codes are in USDA hardiness zones 7b to 8a.
- Apr 8Last spring frost (median)50% chance of 32°F after this date
- Apr 23Safer planting date10% chance of 32°F after this date
- Nov 4First fall frost (median)50% chance of 32°F by this date
- 209 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 6 | Apr 21 | May 8 |
| 32°F | Mar 24 | Apr 8 | Apr 23 |
| 28°F | Mar 7 | Mar 27 | Apr 12 |
| 24°F | Feb 23 | Mar 13 | Apr 1 |
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 10 | Oct 23 | Nov 5 |
| 32°F | Oct 22 | Nov 4 | Nov 20 |
| 28°F | Nov 2 | Nov 17 | Dec 5 |
| 24°F | Nov 13 | Dec 1 | Dec 22 |
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 | 164 days | 183 days | 203 days |
| 32°F | 188 days | 209 days | 231 days |
| 28°F | 212 days | 236 days | 261 days |
| 24°F | 238 days | 263 days | 288 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 |
|---|---|---|---|
| 21837 | 7b | 5 to 10°F | 6 km |
| 21861 | 7b | 5 to 10°F | 10 km |
| 21659 | 7b | 5 to 10°F | 10 km |
| 21835 | 7b | 5 to 10°F | 11 km |
| 21869 | 7b | 5 to 10°F | 14 km |
| 21631 | 7b | 5 to 10°F | 15 km |
| 21664 | 7b | 5 to 10°F | 17 km |
| 21856 | 7b | 5 to 10°F | 18 km |
| 21643 | 7b | 5 to 10°F | 18 km |
| 21613 | 8a | 10 to 15°F | 22 km |
| 21814 | 8a | 10 to 15°F | 23 km |
| 21626 | 8a | 10 to 15°F | 27 km |
| 21840 | 8a | 10 to 15°F | 27 km |
| 21672 | 8a | 10 to 15°F | 31 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 USC00189140, at 38.4875, -75.8211, elevation 3 m (10 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 83.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Salisbury 2n (22 km)
- Salisbury (24 km)
- Salisbury Wicomico Regional Airport (32 km)
- Royal Oak 2 SSW (41 km)
- Snow Hill 4 N (48 km)
- Patuxent River NAS (56 km)
- Solomons (58 km)
- Ocean City Muni Airport (64 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.