When to plant in West Haven, CT
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in West Haven, Connecticut — is derived from the closest NOAA station with complete climate normals.
Zone 7a means many perennials and even some tender shrubs overwinter in West Haven, while your frost dates still decide when annuals go out.
Frost probability
NEW HAVEN TWEED 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 West Haven’s own odds, recorded at NEW HAVEN TWEED AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 12 | Apr 30 | Apr 17 | Oct 4 | Oct 15 | Nov 1 |
| 32°F | May 1 | Apr 17 | Apr 2 | Oct 11 | Oct 27 | Nov 8 |
| 28°F | Apr 18 | Apr 4 | Mar 22 | Oct 22 | Nov 6 | Nov 21 |
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 West Haven, 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.
West Haven planting FAQ
When is the last spring frost in West Haven, CT?
West Haven's average last spring frost falls near April 17 — 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 West Haven, CT?
Expect West Haven's first fall frost near October 27 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is West Haven in?
West Haven 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 West Haven?
There are roughly 193 frost-free days in West Haven (a moderate growing season), running from the average last frost around April 17 to the first fall frost near October 27.
When should I plant tomatoes in West Haven?
In West Haven, start tomato seeds indoors around February 20–March 6, then transplant seedlings outdoors around April 24 once the danger of frost has passed.
Never miss a window in West Haven
An email when it’s time to start seeds, transplant, and sow — timed to West Haven’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Orange · 5 km
- New Haven · 6 km
- East Haven · 9 km
- Milford · 10 km
- Derby · 11 km
- Ansonia · 12 km
- Shelton · 15 km
- North Haven · 15 km
Frost dates recorded at NEW HAVEN TWEED AP, 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 West Haven, CT — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014758. Retrieved from https://blissgarden.com/connecticut/west-haven.