Last frost date in Hopatcong, New Jersey
April 25
Average last frost in spring. In an early year (1 in 10) it's over by April 12; in a late year (1 in 10) it comes after May 11.
October 19
Average first frost in fall. 1 year in 10 it comes by October 5.
Source: NOAA U.S. Climate Normals 1991–2020, station Andover Aeroflex AP (USW00054779), 5.5 miles from Hopatcong, elevation 583 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Hackettstown, so its frost dates are the same as Hopatcong's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 12 | Apr 25 | May 11 |
| First frost in fall | Oct 5 | Oct 19 | Nov 3 |
Frost-free days in an average year: 175
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 7 | Oct 6 |
| Frost (32°F) | Every year | Apr 25 | Oct 19 |
| Hard freeze (28°F) | Every year | Apr 11 | Oct 31 |
Nights at 32°F or colder in an average year: 127
What to plant now in Hopatcong
- Spring planting calendar for an average last frost around April 20 Hopatcong: April 25
- Fall planting calendar for an average first frost around October 20 Hopatcong: October 19
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in New Jersey
- Dover 7 mi · last frost Apr 17
- Kinnelon 15 mi · last frost Apr 25
- Lincoln Park 19 mi · last frost Apr 14
- Summit 23 mi · last frost Apr 18
- Paterson 26 mi · last frost Apr 15
Updated