Frost dates for Glenn Dale Bell Station, MD
At Glenn Dale Bell Station, the median last spring frost (32°F) is Apr 22 and the median first fall frost is Oct 22, for a typical growing season of 183 days. For a 90% chance that the last frost has passed, wait until May 9. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 22Last spring frost (median)50% chance of 32°F after this date
- May 9Safer planting date10% chance of 32°F after this date
- Oct 22First fall frost (median)50% chance of 32°F by this date
- 183 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 18 | May 3 | May 20 |
| 32°F | Apr 3 | Apr 22 | May 9 |
| 28°F | Mar 23 | Apr 7 | Apr 30 |
| 24°F | Mar 10 | Mar 26 | Apr 13 |
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 | Sep 30 | Oct 12 | Oct 26 |
| 32°F | Oct 7 | Oct 22 | Nov 6 |
| 28°F | Oct 16 | Nov 1 | Nov 15 |
| 24°F | Oct 29 | Nov 11 | Dec 1 |
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 | 141 days | 163 days | 183 days |
| 32°F | 161 days | 183 days | 205 days |
| 28°F | 182 days | 207 days | 226 days |
| 24°F | 207 days | 230 days | 254 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 |
|---|---|---|---|
| 20769 | 7b | 5 to 10°F | 3 km |
| 20720 | 7b | 5 to 10°F | 4 km |
| 20706 | 7b | 5 to 10°F | 4 km |
| 20721 | 7b | 5 to 10°F | 6 km |
| 20715 | 7a | 0 to 5°F | 6 km |
| 20771 | 7b | 5 to 10°F | 6 km |
| 20784 | 7b | 5 to 10°F | 8 km |
| 20716 | 7b | 5 to 10°F | 9 km |
| 21114 | 7b | 5 to 10°F | 11 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 USC00183675, at 38.9689, -76.8042, elevation 46 m (150 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 112.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Beltsville (13 km)
- Upper Marlboro 3 NNW (13 km)
- Laurel 3 W (15 km)
- National Arboretum DC (16 km)
- Baltimore Wash Intl Airport (24 km)
- Oxon Hill (25 km)
- Annapolis Police Brks (26 km)
- Dalecarlia Rsvr (27 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.