Califon, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Califon, a borough in Hunterdon County, New Jersey.
Tonight
57°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 2am. Mostly cloudy, with a low around 57. Southeast wind 0 to 5 mph. Chance of precipitation is 20%.
7-day forecast for Califon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 24% |
| Sunday | 71°F | Rain Showers | 5 mph SE | 96% |
| Sunday Night | 55°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 10 mph NW | 83% |
| Monday | 68°F | Partly Sunny then Slight Chance Rain Showers | 5 to 10 mph NE | 23% |
| Monday Night | 50°F | Chance Rain Showers | 5 to 10 mph NE | 30% |
| Tuesday | 63°F | Chance Rain Showers | 5 to 10 mph NE | 34% |
| Tuesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 33% |
| Wednesday | 62°F | Slight Chance Rain Showers | 10 mph NE | 19% |
| Wednesday Night | 48°F | Slight Chance Rain Showers | 5 to 15 mph NE | 21% |
| Thursday | 61°F | Chance Rain Showers | 5 to 15 mph NE | 25% |
| Thursday Night | 48°F | Chance Rain Showers | 5 to 15 mph NE | 31% |
| Friday | 64°F | Chance Rain Showers | 10 to 15 mph N | 33% |
| Friday Night | 49°F | Chance Rain Showers | 5 to 10 mph N | 33% |
| Saturday | 68°F | Chance Rain Showers | 5 to 10 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov) for Califon (40.719, -74.837). Updated through the day.
Growing snapshot for Califon
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
6b
More local growing data for Califon: nearby ZIP 07830 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Annandale
Asbury
Bloomsbury
Clinton
Flemington
Frenchtown
Glen Gardner
Hampton
High Bridge
Lambertville
Lebanon
Milford
Oldwick
Pottersville
Ringoes
Stockton
Three Bridges
White House Station
Climate data from the nearest NOAA station, Somerville Somerset Ap, Nj (9.3 mi from Califon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.