When to plant in New Britain, CT
USDA Zone 6bEverything below — frost dates, hardiness zone, and what to plant when in New Britain, Connecticut — is derived from the closest NOAA station with complete climate normals.
In zone 6b, New Britain gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
HARTFORD BRAINARD FLD · 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 New Britain’s own odds, recorded at HARTFORD BRAINARD FLD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 14 | Apr 30 | Apr 17 | Oct 2 | Oct 14 | Oct 29 |
| 32°F | May 1 | Apr 17 | Apr 1 | Oct 12 | Oct 26 | Nov 7 |
| 28°F | Apr 21 | Apr 3 | Mar 21 | Oct 22 | Nov 5 | Nov 20 |
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 New Britain, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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.
New Britain planting FAQ
When is the last spring frost in New Britain, CT?
On average, the last spring frost in New Britain is around April 17 (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 New Britain, CT?
In New Britain, the first 32°F freeze of fall lands around October 26 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is New Britain in?
New Britain is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in New Britain?
New Britain has about 192 frost-free days — a moderate growing season — between the average last spring frost (April 17) and first fall frost (October 26).
When should I plant tomatoes in New Britain?
For New Britain, sow tomatoes indoors about February 20–March 6 and move the seedlings out around April 24, after the last spring frost.
Never miss a window in New Britain
An email when it’s time to start seeds, transplant, and sow — timed to New Britain’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Newington · 5 km
- Wethersfield · 10 km
- West Hartford · 10 km
- Bristol · 13 km
- Hartford · 13 km
- Meriden · 16 km
- East Hartford · 18 km
- Middletown · 18 km
Frost dates recorded at HARTFORD BRAINARD FLD, 13 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 New Britain, CT — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014752. Retrieved from https://blissgarden.com/connecticut/new-britain.