Frost dates for Annapolis Police Brks, MD
At Annapolis Police Brks, the median last spring frost (32°F) is Mar 27 and the median first fall frost is Nov 13, for a typical growing season of 234 days. For a 90% chance that the last frost has passed, wait until Apr 9. Nearby ZIP codes are in USDA hardiness zones 7b to 8a.
- Mar 27Last spring frost (median)50% chance of 32°F after this date
- Apr 9Safer planting date10% chance of 32°F after this date
- Nov 13First fall frost (median)50% chance of 32°F by this date
- 234 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 7b (5 to 10°F) · see all zone 7b frost dates
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 | Mar 24 | Apr 7 | Apr 24 |
| 32°F | Mar 9 | Mar 27 | Apr 9 |
| 28°F | Feb 26 | Mar 14 | Mar 29 |
| 24°F | Feb 13 | Mar 3 | Mar 19 |
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 21 | Nov 2 | Nov 15 |
| 32°F | Nov 1 | Nov 13 | Dec 1 |
| 28°F | Nov 9 | Nov 28 | Dec 19 |
| 24°F | Nov 23 | Dec 13 | Jan 4 |
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 | 191 days | 210 days | 229 days |
| 32°F | 213 days | 234 days | 257 days |
| 28°F | 234 days | 259 days | 284 days |
| 24°F | 259 days | 285 days | 310 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 |
|---|---|---|---|
| 21401 | 7b | 5 to 10°F | 4 km |
| 21405 | 8a | 10 to 15°F | 5 km |
| 21012 | 8a | 10 to 15°F | 6 km |
| 21140 | 7b | 5 to 10°F | 8 km |
| 21037 | 8a | 10 to 15°F | 9 km |
| 21032 | 7b | 5 to 10°F | 9 km |
| 21146 | 8a | 10 to 15°F | 10 km |
| 21035 | 7b | 5 to 10°F | 12 km |
| 21122 | 8a | 10 to 15°F | 14 km |
| 20776 | 7b | 5 to 10°F | 15 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 USC00180193, at 38.9936, -76.5075, elevation 8 m (25 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 81.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Annapolis Naf (4 km)
- Stevensville 2SW (15 km)
- Baltimore Wash Intl Airport (25 km)
- Glenn Dale Bell Station (26 km)
- Upper Marlboro 3 NNW (28 km)
- Md Sci Center Baltimore (33 km)
- Laurel 3 W (35 km)
- Beltsville (37 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.