When to plant in Martinsville, NJ
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Martinsville, New Jersey — all computed from Martinsville's nearest NOAA weather station.
In zone 7a, Martinsville supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average first fall frost in Martinsville is now 6 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SOMERVILLE 4 NW · 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 Martinsville’s own odds, recorded at SOMERVILLE 4 NW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 24 | May 10 | Apr 27 | Sep 28 | Oct 9 | Oct 24 |
| 32°F | May 14 | Apr 30 | Apr 15 | Oct 5 | Oct 20 | Nov 3 |
| 28°F | May 1 | Apr 15 | Apr 1 | Oct 15 | Oct 31 | Nov 12 |
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 Martinsville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 15 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.
Martinsville planting FAQ
When is the last spring frost in Martinsville, NJ?
On average, the last spring frost in Martinsville is around April 30 (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 Martinsville, NJ?
Expect Martinsville's first fall frost near October 20 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Martinsville in?
Martinsville 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 Martinsville?
Martinsville has about 173 frost-free days — a moderate growing season — between the average last spring frost (April 30) and first fall frost (October 20).
When should I plant tomatoes in Martinsville?
For Martinsville, sow tomatoes indoors about March 5–March 19 and move the seedlings out around May 7, after the last spring frost.
Never miss a window in Martinsville
An email when it’s time to start seeds, transplant, and sow — timed to Martinsville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Somerville · 5 km
- Bound Brook · 5 km
- The Hills · 7 km
- Manville · 7 km
- Middlesex · 7 km
- Bradley Gardens · 8 km
- North Plainfield · 12 km
- Somerset · 12 km
Frost dates recorded at SOMERVILLE 4 NW, 7 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 Martinsville, NJ — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00288194. Retrieved from https://blissgarden.com/new-jersey/martinsville.