When to plant in South River, NJ
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in South River, New Jersey — is derived from the closest NOAA station with complete climate normals.
In zone 7a, South River supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
NEW BRUNSWICK 3 SE · 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 South River’s own odds, recorded at NEW BRUNSWICK 3 SE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 14 | Apr 29 | Apr 14 | Oct 3 | Oct 14 | Oct 30 |
| 32°F | May 1 | Apr 15 | Apr 2 | Oct 11 | Oct 26 | Nov 8 |
| 28°F | Apr 17 | Apr 2 | Mar 18 | Oct 23 | Nov 7 | Nov 23 |
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 South River, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
South River planting FAQ
When is the last spring frost in South River, NJ?
On average, the last spring frost in South River is around April 15 (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 South River, NJ?
The first fall frost in South River typically arrives around October 26 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is South River in?
South River is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in South River?
South River has about 194 frost-free days — a moderate growing season — between the average last spring frost (April 15) and first fall frost (October 26).
When should I plant tomatoes in South River?
For South River, sow tomatoes indoors about February 18–March 4 and move the seedlings out around April 22, after the last spring frost.
Never miss a window in South River
An email when it’s time to start seeds, transplant, and sow — timed to South River’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Sayreville · 5 km
- Old Bridge · 7 km
- New Brunswick · 7 km
- Highland Park · 7 km
- East Franklin · 9 km
- Metuchen · 11 km
- Fords · 11 km
- Perth Amboy · 12 km
Frost dates recorded at NEW BRUNSWICK 3 SE, 5 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 South River, NJ — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00286055. Retrieved from https://blissgarden.com/new-jersey/south-river.