When to plant in Hopatcong, NJ
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Hopatcong, New Jersey — all computed from Hopatcong's nearest NOAA weather station.
In zone 6b, Hopatcong gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
ANDOVER AEROFLEX AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Hopatcong’s own odds, recorded at ANDOVER AEROFLEX AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 7 | Apr 22 | Sep 26 | Oct 6 | Oct 22 |
| 32°F | May 11 | Apr 25 | Apr 12 | Oct 5 | Oct 19 | Nov 3 |
| 28°F | Apr 28 | Apr 11 | Mar 31 | Oct 15 | Oct 31 | Nov 13 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Hopatcong, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Hopatcong planting FAQ
When is the last spring frost in Hopatcong, NJ?
On average, the last spring frost in Hopatcong is around April 25 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Hopatcong, NJ?
In Hopatcong, the first 32°F freeze of fall lands around October 19 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Hopatcong in?
Hopatcong is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Hopatcong?
Hopatcong has about 177 frost-free days — a moderate growing season — between the average last spring frost (April 25) and first fall frost (October 19).
When should I plant tomatoes in Hopatcong?
For Hopatcong, sow tomatoes indoors about February 28–March 14 and move the seedlings out around May 2, after the last spring frost.
Never miss a window in Hopatcong
An email when it’s time to start seeds, transplant, and sow — timed to Hopatcong’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lake Hopatcong · 5 km
- Budd Lake · 11 km
- Dover · 11 km
- Oak Ridge · 16 km
- Hackettstown · 17 km
- Parsippany · 23 km
- Morristown · 23 km
- Kinnelon · 23 km
Frost dates recorded at ANDOVER AEROFLEX AP, 9 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Hopatcong, NJ — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00054779. Retrieved from https://blissgarden.com/new-jersey/hopatcong.