Frost dates for Hagerstown Washington Co Airport, MD
At Hagerstown Washington Co Airport, the median last spring frost (32°F) is Apr 7 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 21. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 7Last spring frost (median)50% chance of 32°F after this date
- Apr 21Safer 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 19 | May 7 |
| 32°F | Mar 25 | Apr 7 | Apr 21 |
| 28°F | Mar 13 | Mar 28 | Apr 8 |
| 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 9 | Oct 23 | Nov 5 |
| 32°F | Oct 22 | Nov 4 | Nov 17 |
| 28°F | Nov 1 | Nov 14 | Dec 2 |
| 24°F | Nov 11 | Nov 29 | Dec 17 |
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 | 165 days | 186 days | 206 days |
| 32°F | 189 days | 209 days | 228 days |
| 28°F | 212 days | 232 days | 256 days |
| 24°F | 234 days | 257 days | 282 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 |
|---|---|---|---|
| 21767 | 7a | 0 to 5°F | 2 km |
| 17263 | 7b | 5 to 10°F | 2 km |
| 17225 | 7a | 0 to 5°F | 9 km |
| 21722 | 7a | 0 to 5°F | 16 km |
| 17236 | 7a | 0 to 5°F | 21 km |
| 17212 | 7a | 0 to 5°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 USW00093706, at 39.7078, -77.7297, elevation 213 m (698 ft).
- Data quality: Representative (10+ years), 18 years of freeze data.
- Average days per year at or below 32°F: 93.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hagerstown 1 E (8 km)
- Smithsburg 2nw (13 km)
- Catoctin Mountain Park (22 km)
- Sharpsburg 5 S (34 km)
- Emmitsburg 2 SE (38 km)
- Frederick Police Brks (41 km)
- Damascus 3 SSW (65 km)
- Millers 4 NE (79 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.