When to plant in Windsor Locks, CT
USDA Zone 6bWindsor Locks, 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 Windsor Locks sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
HARTFORD BRADLEY INTL 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 Windsor Locks’s own odds, recorded at HARTFORD BRADLEY INTL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 18 | May 5 | Apr 22 | Sep 26 | Oct 6 | Oct 21 |
| 32°F | May 6 | Apr 21 | Apr 8 | Oct 3 | Oct 16 | Nov 2 |
| 28°F | Apr 22 | Apr 7 | Mar 26 | Oct 13 | Oct 29 | 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 Windsor Locks, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Windsor Locks planting FAQ
When is the last spring frost in Windsor Locks, CT?
Plan for the last spring frost in Windsor Locks around April 21 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Windsor Locks, CT?
Expect Windsor Locks's first fall frost near October 16 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Windsor Locks in?
Windsor Locks 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 Windsor Locks?
There are roughly 178 frost-free days in Windsor Locks (a moderate growing season), running from the average last frost around April 21 to the first fall frost near October 16.
When should I plant tomatoes in Windsor Locks?
In Windsor Locks, start tomato seeds indoors around February 24–March 10, then transplant seedlings outdoors around April 28 once the danger of frost has passed.
Never miss a window in Windsor Locks
An email when it’s time to start seeds, transplant, and sow — timed to Windsor Locks’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Longmeadow · 15 km
- Agawam Town · 15 km
- Hartford · 18 km
- East Hartford · 19 km
- Manchester · 20 km
- West Hartford · 20 km
- West Springfield Town · 22 km
- Springfield · 23 km
Frost dates recorded at HARTFORD BRADLEY INTL AP, 3 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 Windsor Locks, CT — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014740. Retrieved from https://blissgarden.com/connecticut/windsor-locks.