Frost dates for Md Sci Center Baltimore, MD
At Md Sci Center Baltimore, the median last spring frost (32°F) is Mar 24 and the median first fall frost is Nov 21, for a typical growing season of 244 days. For a 90% chance that the last frost has passed, wait until Apr 4. Nearby ZIP codes are in USDA hardiness zones 7b to 8a.
- Mar 24Last spring frost (median)50% chance of 32°F after this date
- Apr 4Safer planting date10% chance of 32°F after this date
- Nov 21First fall frost (median)50% chance of 32°F by this date
- 244 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 3 | Apr 15 |
| 32°F | Mar 8 | Mar 24 | Apr 4 |
| 28°F | Feb 24 | Mar 11 | Mar 26 |
| 24°F | Feb 9 | Mar 2 | Mar 16 |
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 29 | Nov 10 | Nov 24 |
| 32°F | Nov 7 | Nov 21 | Dec 8 |
| 28°F | Nov 18 | Dec 5 | Dec 25 |
| 24°F | Dec 1 | Dec 23 | Jan 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 | 202 days | 221 days | 241 days |
| 32°F | 224 days | 244 days | 268 days |
| 28°F | 247 days | 270 days | 294 days |
| 24°F | 269 days | 294 days | 319 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 |
|---|---|---|---|
| 21233 | 8a | 10 to 15°F | 1 km |
| 21231 | 8a | 10 to 15°F | 2 km |
| 21202 | 8a | 10 to 15°F | 2 km |
| 21201 | 8a | 10 to 15°F | 2 km |
| 21230 | 8a | 10 to 15°F | 2 km |
| 21217 | 7b | 5 to 10°F | 4 km |
| 21223 | 7b | 5 to 10°F | 4 km |
| 21205 | 8a | 10 to 15°F | 4 km |
| 21213 | 8a | 10 to 15°F | 5 km |
| 21224 | 8a | 10 to 15°F | 6 km |
| 21225 | 8a | 10 to 15°F | 6 km |
| 21229 | 7b | 5 to 10°F | 7 km |
| 21227 | 7b | 5 to 10°F | 8 km |
| 21206 | 7b | 5 to 10°F | 9 km |
| 21226 | 8a | 10 to 15°F | 9 km |
| 21250 | 7b | 5 to 10°F | 9 km |
| 21222 | 8a | 10 to 15°F | 10 km |
| 21237 | 8a | 10 to 15°F | 12 km |
| 21228 | 7b | 5 to 10°F | 12 km |
| 21221 | 8a | 10 to 15°F | 15 km |
| 21219 | 8a | 10 to 15°F | 16 km |
| 21052 | 8a | 10 to 15°F | 17 km |
| 21220 | 8a | 10 to 15°F | 20 km |
| 21162 | 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 USW00093784, at 39.2814, -76.6089, elevation 6 m (20 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 52.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cylburn (9 km)
- Baltimore Wash Intl Airport (14 km)
- Annapolis Police Brks (33 km)
- Laurel 3 W (33 km)
- Annapolis Naf (35 km)
- Glenn Dale Bell Station (39 km)
- Beltsville (39 km)
- Stevensville 2sw (42 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.