Frost dates · New Jersey
New Jersey frost dates,
county by county.
Last spring frost and first fall frost probability data for all 21 counties in New Jersey, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.
Variation across New Jersey
31 days separate the earliest and latest counties.
The median last spring frost in Cape May County is March 19 — 31 days earlier than Sussex County at April 19. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
By frost timing
Counties sorted by last spring frost.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
- Sussex CountySpring Apr 19·Fall Oct 25189-day season
- Warren CountySpring Apr 16·Fall Oct 29196-day season
- Burlington CountySpring Apr 15·Fall Oct 27195-day season
- Somerset CountySpring Apr 15·Fall Oct 31199-day season
- Cumberland CountySpring Apr 10·Fall Nov 2206-day season
- Hunterdon CountySpring Apr 8·Fall Nov 2208-day season
- Ocean CountySpring Apr 8·Fall Nov 1207-day season
- Atlantic CountySpring Apr 5·Fall Nov 8217-day season
- Morris CountySpring Apr 4·Fall Nov 2212-day season
- Passaic CountySpring Apr 4·Fall Nov 4214-day season
- Essex CountySpring Apr 3·Fall Nov 4215-day season
- Mercer CountySpring Apr 2·Fall Nov 7219-day season
- Middlesex CountySpring Apr 2·Fall Nov 7219-day season
- Monmouth CountySpring Apr 2·Fall Nov 3215-day season
- Union CountySpring Mar 30·Fall Nov 12227-day season
- Salem CountySpring Mar 29·Fall Nov 13229-day season
- Camden CountySpring Mar 27·Fall Nov 11229-day season
- Gloucester CountySpring Mar 27·Fall Nov 11229-day season
- Hudson CountySpring Mar 26·Fall Nov 19238-day season
- Bergen CountySpring Mar 23·Fall Nov 16238-day season
- Cape May CountySpring Mar 19·Fall Nov 23249-day season
Alphabetical