When to plant in Roselle, NJ
USDA Zone 7bEverything below — frost dates, hardiness zone, and what to plant when in Roselle, New Jersey — is derived from the closest NOAA station with complete climate normals.
Zone 7b means many perennials and even some tender shrubs overwinter in Roselle, while your frost dates still decide when annuals go out.
The average last spring frost in Roselle is now 16 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
CRANFORD · 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 Roselle’s own odds, recorded at CRANFORD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 11 | Apr 25 | Apr 10 | Oct 7 | Oct 20 | Nov 4 |
| 32°F | Apr 28 | Apr 11 | Mar 30 | Oct 14 | Oct 31 | Nov 15 |
| 28°F | Apr 12 | Mar 30 | Mar 14 | Oct 27 | Nov 12 | Dec 1 |
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 Roselle, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Roselle planting FAQ
When is the last spring frost in Roselle, NJ?
Roselle's average last spring frost falls near April 11 — 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 Roselle, NJ?
Expect Roselle's first fall frost near October 31 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Roselle in?
Roselle is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Roselle?
There are roughly 203 frost-free days in Roselle (a moderate growing season), running from the average last frost around April 11 to the first fall frost near October 31.
When should I plant tomatoes in Roselle?
In Roselle, start tomato seeds indoors around February 14–February 28, then transplant seedlings outdoors around April 18 once the danger of frost has passed.
Never miss a window in Roselle
An email when it’s time to start seeds, transplant, and sow — timed to Roselle’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at CRANFORD, 6 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 Roselle, NJ — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00282023. Retrieved from https://blissgarden.com/new-jersey/roselle.