Frost dates for Cylburn, MD
At Cylburn, the median last spring frost (32°F) is Apr 2 and the median first fall frost is Nov 7, for a typical growing season of 220 days. For a 90% chance that the last frost has passed, wait until Apr 13. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 2Last spring frost (median)50% chance of 32°F after this date
- Apr 13Safer planting date10% chance of 32°F after this date
- Nov 7First fall frost (median)50% chance of 32°F by this date
- 220 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 2 | Apr 14 | May 1 |
| 32°F | Mar 20 | Apr 2 | Apr 13 |
| 28°F | Mar 8 | Mar 22 | Apr 3 |
| 24°F | Feb 25 | Mar 13 | Mar 26 |
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 13 | Oct 27 | Nov 9 |
| 32°F | Oct 27 | Nov 7 | Nov 21 |
| 28°F | Nov 6 | Nov 20 | Dec 7 |
| 24°F | Nov 17 | Dec 5 | Dec 26 |
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 | 174 days | 195 days | 213 days |
| 32°F | 203 days | 220 days | 239 days |
| 28°F | 225 days | 243 days | 267 days |
| 24°F | 244 days | 268 days | 293 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 |
|---|---|---|---|
| 21210 | 7b | 5 to 10°F | 2 km |
| 21215 | 7b | 5 to 10°F | 3 km |
| 21209 | 7b | 5 to 10°F | 3 km |
| 21211 | 7b | 5 to 10°F | 3 km |
| 21212 | 7b | 5 to 10°F | 4 km |
| 21285 | 7b | 5 to 10°F | 5 km |
| 21216 | 7b | 5 to 10°F | 5 km |
| 21218 | 7b | 5 to 10°F | 5 km |
| 21252 | 7b | 5 to 10°F | 6 km |
| 21239 | 7b | 5 to 10°F | 6 km |
| 21204 | 7b | 5 to 10°F | 6 km |
| 21207 | 7b | 5 to 10°F | 6 km |
| 21208 | 7b | 5 to 10°F | 7 km |
| 21214 | 7b | 5 to 10°F | 8 km |
| 21153 | 7b | 5 to 10°F | 8 km |
| 21093 | 7b | 5 to 10°F | 9 km |
| 21286 | 7b | 5 to 10°F | 10 km |
| 21244 | 7b | 5 to 10°F | 11 km |
| 21234 | 7b | 5 to 10°F | 11 km |
| 21117 | 7a | 0 to 5°F | 13 km |
| 21133 | 7a | 0 to 5°F | 14 km |
| 21031 | 7b | 5 to 10°F | 15 km |
| 21236 | 7b | 5 to 10°F | 15 km |
| 21057 | 7b | 5 to 10°F | 16 km |
| 21163 | 7b | 5 to 10°F | 17 km |
| 21131 | 7b | 5 to 10°F | 18 km |
| 21030 | 7b | 5 to 10°F | 18 km |
| 21128 | 7b | 5 to 10°F | 19 km |
| 21136 | 7a | 0 to 5°F | 19 km |
| 21071 | 7a | 0 to 5°F | 20 km |
| 21023 | 7b | 5 to 10°F | 20 km |
| 21082 | 7b | 5 to 10°F | 21 km |
| 21051 | 7b | 5 to 10°F | 22 km |
| 21104 | 7b | 5 to 10°F | 22 km |
| 21013 | 7b | 5 to 10°F | 23 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 USC00182308, at 39.3531, -76.6539, elevation 72 m (235 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 92.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Md Sci Center Baltimore (9 km)
- Baltimore Wash Intl Airport (21 km)
- Laurel 3 W (37 km)
- Annapolis Police Brks (42 km)
- Millers 4 NE (43 km)
- Beltsville (43 km)
- Aberdeen Phillips Field (44 km)
- Annapolis Naf (44 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.