Frost dates for Georgetown Sussex Co Airport, DE
At Georgetown Sussex Co Airport, the median last spring frost (32°F) is Apr 4 and the median first fall frost is Nov 6, 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 4Last spring frost (median)50% chance of 32°F after this date
- Apr 16Safer planting date10% chance of 32°F after this date
- Nov 6First 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 16 | May 2 |
| 32°F | Mar 22 | Apr 4 | Apr 16 |
| 28°F | Mar 3 | Mar 23 | Apr 5 |
| 24°F | Feb 20 | Mar 10 | Mar 25 |
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 8 |
| 32°F | Oct 23 | Nov 6 | Nov 22 |
| 28°F | Nov 4 | Nov 19 | Dec 6 |
| 24°F | Nov 14 | Dec 4 | Dec 27 |
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 | 170 days | 191 days | 211 days |
| 32°F | 198 days | 217 days | 239 days |
| 28°F | 223 days | 244 days | 268 days |
| 24°F | 248 days | 271 days | 300 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 |
|---|---|---|---|
| 19947 | 7b | 5 to 10°F | 4 km |
| 19951 | 7b | 5 to 10°F | 9 km |
| 19941 | 7b | 5 to 10°F | 13 km |
| 19966 | 7b | 5 to 10°F | 14 km |
| 19939 | 7b | 5 to 10°F | 19 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 USW00013764, at 38.6892, -75.3592, elevation 16 m (51 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 83.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Lewes (20 km)
- Greenwood 2ne (24 km)
- Dover (52 km)
- Wilmington New Castle Co Airport (111 km)
- Newark Ag Farm (114 km)
- Wilmington Porter Rsch (122 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.