Hackettstown, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hackettstown, a town in Warren County, New Jersey.
Overnight
60°F
Mostly Clear
Mostly clear, with a low around 60. Wind around 0 mph.
7-day forecast for Hackettstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 83°F | Mostly Sunny | 0 mph | 0% |
| Tuesday Night | 62°F | Mostly Cloudy | 0 mph | 1% |
| Wednesday | 82°F | Partly Sunny then Chance Showers And Thunderstorms | 0 mph | 49% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 mph | 57% |
| Thursday | 87°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 73% |
| Thursday Night | 70°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 73% |
| Friday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 52% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 0 mph | 52% |
| Saturday | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 53% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 53% |
| Sunday | 86°F | Mostly Sunny | 0 to 5 mph W | 12% |
| Sunday Night | 68°F | Mostly Clear | 0 mph | 12% |
| Monday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov) for Hackettstown (40.854, -74.825). Updated through the day.
Growing snapshot for Hackettstown
Last spring frost
Apr 25
First fall frost
Oct 19
Growing season
175 days
Hardiness zone
6b
More local growing data for Hackettstown: nearby ZIP 07840 weather · frost dates · planting calendar · New Jersey frost dates
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Climate data from the nearest NOAA station, Andover Aeroflex Ap, Nj (11.4 mi from Hackettstown). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.