Frost dates for Newark Ag Farm, DE
At Newark Ag Farm, the median last spring frost (32°F) is Apr 7 and the median first fall frost is Nov 2, for a typical growing season of 208 days. For a 90% chance that the last frost has passed, wait until Apr 21. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 7Last spring frost (median)50% chance of 32°F after this date
- Apr 21Safer planting date10% chance of 32°F after this date
- Nov 2First fall frost (median)50% chance of 32°F by this date
- 208 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 8 | Apr 22 | May 9 |
| 32°F | Mar 26 | Apr 7 | Apr 21 |
| 28°F | Mar 11 | Mar 27 | Apr 8 |
| 24°F | Feb 27 | Mar 14 | Mar 29 |
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 9 | Oct 22 | Nov 4 |
| 32°F | Oct 19 | Nov 2 | Nov 17 |
| 28°F | Nov 1 | Nov 13 | Dec 1 |
| 24°F | Nov 10 | Nov 28 | Dec 18 |
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 | 161 days | 183 days | 202 days |
| 32°F | 190 days | 208 days | 228 days |
| 28°F | 213 days | 231 days | 255 days |
| 24°F | 235 days | 258 days | 283 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 |
|---|---|---|---|
| 19716 | 7b | 5 to 10°F | 0 km |
| 19717 | 7b | 5 to 10°F | 1 km |
| 19713 | 7b | 5 to 10°F | 3 km |
| 19711 | 7b | 5 to 10°F | 5 km |
| 19702 | 7b | 5 to 10°F | 6 km |
| 21920 | 7a | 0 to 5°F | 8 km |
| 19701 | 7b | 5 to 10°F | 10 km |
| 21921 | 7b | 5 to 10°F | 11 km |
| 19709 | 7b | 5 to 10°F | 20 km |
| 21915 | 7b | 5 to 10°F | 21 km |
| 21912 | 7b | 5 to 10°F | 28 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 USC00076410, at 39.6683, -75.7456, elevation 32 m (106 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
- Wilmington New Castle Co Airport (12 km)
- Wilmington Porter Rsch (21 km)
- Dover (62 km)
- Greenwood 2ne (96 km)
- Lewes (111 km)
- Georgetown Sussex Co Airport (114 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.