Frost dates for Sussex Airport, NJ
At Sussex Airport, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 12, for a typical growing season of 164 days. For a 90% chance that the last frost has passed, wait until May 18. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 18Safer planting date10% chance of 32°F after this date
- Oct 12First fall frost (median)50% chance of 32°F by this date
- 164 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 6b (-5 to 0°F) · see all zone 6b frost dates
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 27 | May 13 | May 28 |
| 32°F | Apr 19 | May 1 | May 18 |
| 28°F | Apr 4 | Apr 19 | May 4 |
| 24°F | Mar 21 | Apr 4 | Apr 20 |
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 | Sep 20 | Oct 2 | Oct 15 |
| 32°F | Sep 30 | Oct 12 | Oct 28 |
| 28°F | Oct 9 | Oct 25 | Nov 7 |
| 24°F | Oct 21 | Nov 4 | Nov 20 |
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 | 121 days | 142 days | 163 days |
| 32°F | 141 days | 164 days | 184 days |
| 28°F | 167 days | 188 days | 210 days |
| 24°F | 194 days | 214 days | 236 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 |
|---|---|---|---|
| 07419 | 6b | -5 to 0°F | 7 km |
| 07822 | 6b | -5 to 0°F | 10 km |
| 07416 | 6b | -5 to 0°F | 11 km |
| 07462 | 6b | -5 to 0°F | 11 km |
| 07418 | 6b | -5 to 0°F | 12 km |
| 07439 | 6b | -5 to 0°F | 14 km |
| 07422 | 6b | -5 to 0°F | 15 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 USW00054793, at 41.2003, -74.6231, elevation 128 m (421 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 135.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sussex 3 WNW (4 km)
- Sussex 8 NNW (14 km)
- Newton (20 km)
- Andover Aeroflex Airport (23 km)
- Charlotteburg Rsvr (25 km)
- Wanaque Raymond Dam (33 km)
- Boonton 1 SE (39 km)
- Caldwell Essex Co Airport (46 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.