When to plant in Blackwells Mills, NJ
USDA Zone 7aBlackwells Mills, New Jersey frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 7a, Blackwells Mills 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 Blackwells Mills’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 Blackwells Mills, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Blackwells Mills planting FAQ
When is the last spring frost in Blackwells Mills, NJ?
Blackwells Mills's average last spring frost falls near April 15 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Blackwells Mills, NJ?
Expect Blackwells Mills's first fall frost near October 26 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Blackwells Mills in?
Blackwells Mills 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 Blackwells Mills?
Blackwells Mills 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 Blackwells Mills?
For Blackwells Mills, 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 Blackwells Mills
An email when it’s time to start seeds, transplant, and sow — timed to Blackwells Mills’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Hillsborough · 6 km
- Franklin Park · 6 km
- Manville · 7 km
- Kendall Park · 8 km
- Somerset · 9 km
- Somerville · 10 km
- East Franklin · 11 km
- Bound Brook · 11 km
Frost dates recorded at NEW BRUNSWICK 3 SE, 15 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 Blackwells Mills, NJ — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00286055. Retrieved from https://blissgarden.com/new-jersey/blackwells-mills.