Frost dates for Annapolis Naf, MD
At Annapolis Naf, the median last spring frost (32°F) is Mar 23 and the median first fall frost is Nov 20, for a typical growing season of 241 days. For a 90% chance that the last frost has passed, wait until Apr 6. Nearby ZIP codes are in USDA hardiness zone 8a.
- Mar 23Last spring frost (median)50% chance of 32°F after this date
- Apr 6Safer planting date10% chance of 32°F after this date
- Nov 20First fall frost (median)50% chance of 32°F by this date
- 241 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 | Mar 22 | Apr 5 | Apr 20 |
| 32°F | Mar 8 | Mar 23 | Apr 6 |
| 28°F | Feb 24 | Mar 12 | Mar 28 |
| 24°F | Feb 9 | Mar 1 | 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 25 | Nov 6 | Nov 21 |
| 32°F | Nov 4 | Nov 20 | Dec 5 |
| 28°F | Nov 16 | Dec 3 | Dec 22 |
| 24°F | Nov 30 | Dec 18 | Jan 9 |
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 | 193 days | 215 days | 234 days |
| 32°F | 219 days | 241 days | 265 days |
| 28°F | 242 days | 266 days | 291 days |
| 24°F | 267 days | 291 days | 316 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 |
|---|---|---|---|
| 21402 | 8a | 10 to 15°F | 1 km |
| 21409 | 8a | 10 to 15°F | 4 km |
| 21403 | 8a | 10 to 15°F | 5 km |
| 21056 | 8a | 10 to 15°F | 11 km |
| 20764 | 8a | 10 to 15°F | 17 km |
| 20733 | 8a | 10 to 15°F | 21 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 USW00013752, at 38.9833, -76.4667, elevation 2 m (8 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 56.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Annapolis Police Brks (4 km)
- Stevensville 2sw (11 km)
- Baltimore Wash Intl Airport (28 km)
- Glenn Dale Bell Station (29 km)
- Upper Marlboro 3 NNW (30 km)
- Md Sci Center Baltimore (35 km)
- Royal Oak 2 SSW (38 km)
- Laurel 3 W (39 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.