When to plant in Willimantic, CT
USDA Zone 6bWillimantic, Connecticut frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 6b means Willimantic sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
WILLIMANTIC WINDHAM 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 Willimantic’s own odds, recorded at WILLIMANTIC WINDHAM AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 9 | Apr 27 | Sep 23 | Oct 3 | Oct 16 |
| 32°F | May 11 | Apr 28 | Apr 17 | Oct 2 | Oct 13 | Oct 29 |
| 28°F | Apr 29 | Apr 14 | Apr 2 | Oct 10 | Oct 25 | Nov 7 |
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 Willimantic, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 14 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.
Willimantic planting FAQ
When is the last spring frost in Willimantic, CT?
On average, the last spring frost in Willimantic is around April 28 (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 Willimantic, CT?
In Willimantic, the first 32°F freeze of fall lands around October 13 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Willimantic in?
Willimantic 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 Willimantic?
There are roughly 168 frost-free days in Willimantic (a moderate growing season), running from the average last frost around April 28 to the first fall frost near October 13.
When should I plant tomatoes in Willimantic?
In Willimantic, start tomato seeds indoors around March 3–March 17, then transplant seedlings outdoors around May 5 once the danger of frost has passed.
Never miss a window in Willimantic
An email when it’s time to start seeds, transplant, and sow — timed to Willimantic’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Storrs · 11 km
- Norwich · 21 km
- Manchester · 27 km
- East Hartford · 33 km
- Wethersfield · 38 km
- Hartford · 39 km
- Southbridge Town · 41 km
- Middletown · 41 km
Frost dates recorded at WILLIMANTIC WINDHAM AP, 4 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 Willimantic, CT — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00054767. Retrieved from https://blissgarden.com/connecticut/willimantic.