Frost dates for Belvidere Brg, NJ
At Belvidere Brg, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 18, for a typical growing season of 168 days. For a 90% chance that the last frost has passed, wait until May 18. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 18Safer planting date10% chance of 32°F after this date
- Oct 18First fall frost (median)50% chance of 32°F by this date
- 168 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 26 | May 12 | May 29 |
| 32°F | Apr 15 | Apr 30 | May 18 |
| 28°F | Apr 2 | Apr 16 | May 5 |
| 24°F | Mar 20 | Apr 3 | Apr 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 | Sep 25 | Oct 6 | Oct 20 |
| 32°F | Oct 3 | Oct 18 | Nov 1 |
| 28°F | Oct 14 | Oct 29 | Nov 10 |
| 24°F | Oct 26 | Nov 8 | Nov 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 | 125 days | 147 days | 168 days |
| 32°F | 145 days | 168 days | 191 days |
| 28°F | 172 days | 195 days | 214 days |
| 24°F | 200 days | 219 days | 239 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 |
|---|---|---|---|
| 07823 | 7a | 0 to 5°F | 3 km |
| 18343 | 6b | -5 to 0°F | 7 km |
| 07833 | 7a | 0 to 5°F | 7 km |
| 18013 | 7a | 0 to 5°F | 7 km |
| 18063 | 7a | 0 to 5°F | 10 km |
| 07882 | 6b | -5 to 0°F | 10 km |
| 18351 | 6b | -5 to 0°F | 11 km |
| 07863 | 6b | -5 to 0°F | 11 km |
| 07832 | 6b | -5 to 0°F | 13 km |
| 07844 | 6b | -5 to 0°F | 13 km |
| 18072 | 6b | -5 to 0°F | 15 km |
| 07831 | 6b | -5 to 0°F | 15 km |
| 07838 | 6b | -5 to 0°F | 16 km |
| 07865 | 6b | -5 to 0°F | 16 km |
| 07880 | 6b | -5 to 0°F | 18 km |
| 07870 | 6b | -5 to 0°F | 22 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 USC00280734, at 40.8292, -75.0833, elevation 80 m (263 ft).
- Data quality: Representative (10+ years), 25 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
- Phillipsburg-Easton Brg (18 km)
- Flemington 5 NNW (33 km)
- Andover Aeroflex Airport (35 km)
- Newton (37 km)
- Somerville Somerset Airport (42 km)
- Somerville 4 NW (43 km)
- Wertsville 4 NE (49 km)
- Lambertville (54 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.