Frost dates for Hagerstown 1 E, MD
At Hagerstown 1 E, the median last spring frost (32°F) is Apr 11 and the median first fall frost is Oct 28, for a typical growing season of 199 days. For a 90% chance that the last frost has passed, wait until Apr 27. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 11Last spring frost (median)50% chance of 32°F after this date
- Apr 27Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 199 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 9 | Apr 23 | May 9 |
| 32°F | Mar 29 | Apr 11 | Apr 27 |
| 28°F | Mar 14 | Mar 31 | Apr 11 |
| 24°F | Feb 28 | Mar 17 | Apr 2 |
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 5 | Oct 18 | Oct 31 |
| 32°F | Oct 14 | Oct 28 | Nov 11 |
| 28°F | Oct 26 | Nov 9 | Nov 25 |
| 24°F | Nov 6 | Nov 23 | Dec 11 |
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 | 155 days | 176 days | 195 days |
| 32°F | 179 days | 199 days | 219 days |
| 28°F | 203 days | 223 days | 245 days |
| 24°F | 226 days | 249 days | 274 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 |
|---|---|---|---|
| 21734 | 7a | 0 to 5°F | 4 km |
| 21740 | 7a | 0 to 5°F | 4 km |
| 21742 | 7a | 0 to 5°F | 6 km |
| 21746 | 7a | 0 to 5°F | 8 km |
| 21781 | 7a | 0 to 5°F | 9 km |
| 21733 | 7a | 0 to 5°F | 11 km |
| 21795 | 7a | 0 to 5°F | 13 km |
| 21713 | 7a | 0 to 5°F | 13 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 USC00181790, at 39.6403, -77.6978, elevation 162 m (532 ft).
- Data quality: Estimated from nearby stations (2+ years), 3 years of freeze data.
- Average days per year at or below 32°F: 103.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hagerstown Washington Co Airport (8 km)
- Smithsburg 2nw (10 km)
- Catoctin Mountain Park (18 km)
- Sharpsburg 5 S (27 km)
- Frederick Police Brks (33 km)
- Emmitsburg 2 SE (36 km)
- Damascus 3 SSW (58 km)
- Rockville 1 NE (76 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.