Frost dates for Damascus 3 SSW, MD
At Damascus 3 SSW, the median last spring frost (32°F) is Apr 14 and the median first fall frost is Oct 29, for a typical growing season of 196 days. For a 90% chance that the last frost has passed, wait until May 2. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 14Last spring frost (median)50% chance of 32°F after this date
- May 2Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 196 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 14 | Apr 28 | May 15 |
| 32°F | Mar 31 | Apr 14 | May 2 |
| 28°F | Mar 18 | Apr 2 | Apr 16 |
| 24°F | Mar 5 | Mar 23 | Apr 5 |
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 17 | Oct 31 |
| 32°F | Oct 13 | Oct 29 | Nov 12 |
| 28°F | Oct 26 | Nov 8 | Nov 24 |
| 24°F | Nov 5 | Nov 20 | Dec 12 |
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 | 152 days | 171 days | 192 days |
| 32°F | 174 days | 196 days | 216 days |
| 28°F | 201 days | 220 days | 242 days |
| 24°F | 223 days | 245 days | 271 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 |
|---|---|---|---|
| 20871 | 7a | 0 to 5°F | 4 km |
| 20872 | 7b | 5 to 10°F | 4 km |
| 20876 | 7b | 5 to 10°F | 6 km |
| 20882 | 7b | 5 to 10°F | 7 km |
| 20886 | 7b | 5 to 10°F | 9 km |
| 21770 | 7a | 0 to 5°F | 10 km |
| 21754 | 7a | 0 to 5°F | 10 km |
| 20841 | 7b | 5 to 10°F | 12 km |
| 20838 | 7a | 0 to 5°F | 13 km |
| 21771 | 7a | 0 to 5°F | 16 km |
| 21797 | 7b | 5 to 10°F | 16 km |
| 20842 | 7b | 5 to 10°F | 17 km |
| 21737 | 7b | 5 to 10°F | 18 km |
| 21738 | 7b | 5 to 10°F | 18 km |
| 20839 | 7b | 5 to 10°F | 19 km |
| 21723 | 7a | 0 to 5°F | 21 km |
| 21794 | 7b | 5 to 10°F | 23 km |
| 21784 | 7a | 0 to 5°F | 27 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 USC00182336, at 39.2647, -77.2319, elevation 213 m (700 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 98.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rockville 1 NE (20 km)
- Frederick Police Brks (25 km)
- Laurel 3 W (35 km)
- Beltsville (37 km)
- Dalecarlia Rsvr (38 km)
- Sharpsburg 5 S (45 km)
- National Arboretum DC (45 km)
- Emmitsburg 2 SE (46 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.