Frost dates for Chestertown, MD
At Chestertown, the median last spring frost (32°F) is Apr 3 and the median first fall frost is Nov 5, for a typical growing season of 217 days. For a 90% chance that the last frost has passed, wait until Apr 16. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 3Last spring frost (median)50% chance of 32°F after this date
- Apr 16Safer planting date10% chance of 32°F after this date
- Nov 5First fall frost (median)50% chance of 32°F by this date
- 217 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 1 | Apr 15 | Apr 30 |
| 32°F | Mar 20 | Apr 3 | Apr 16 |
| 28°F | Mar 7 | Mar 21 | Apr 3 |
| 24°F | Feb 23 | Mar 10 | Mar 23 |
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 12 | Oct 26 | Nov 8 |
| 32°F | Oct 24 | Nov 5 | Nov 20 |
| 28°F | Nov 5 | Nov 17 | Dec 5 |
| 24°F | Nov 13 | Dec 1 | Dec 23 |
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 | 193 days | 213 days |
| 32°F | 198 days | 217 days | 237 days |
| 28°F | 221 days | 240 days | 262 days |
| 24°F | 242 days | 267 days | 294 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 |
|---|---|---|---|
| 21620 | 7b | 5 to 10°F | 3 km |
| 21628 | 7b | 5 to 10°F | 11 km |
| 21678 | 7b | 5 to 10°F | 12 km |
| 21623 | 7b | 5 to 10°F | 13 km |
| 21645 | 7b | 5 to 10°F | 14 km |
| 21667 | 7b | 5 to 10°F | 14 km |
| 21651 | 7b | 5 to 10°F | 17 km |
| 21668 | 7b | 5 to 10°F | 18 km |
| 21617 | 7b | 5 to 10°F | 19 km |
| 21644 | 7b | 5 to 10°F | 19 km |
| 21607 | 7b | 5 to 10°F | 19 km |
| 21635 | 7b | 5 to 10°F | 22 km |
| 21930 | 7b | 5 to 10°F | 22 km |
| 21650 | 7b | 5 to 10°F | 23 km |
| 21640 | 7b | 5 to 10°F | 26 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 USC00181750, at 39.2167, -76.0519, elevation 12 m (40 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 97.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Aberdeen Phillips Field (30 km)
- Stevensville 2sw (37 km)
- Annapolis Naf (44 km)
- Annapolis Police Brks (46 km)
- Md Sci Center Baltimore (48 km)
- Conowingo Dam (50 km)
- Cylburn (54 km)
- Baltimore Wash Intl Airport (55 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.