When to plant in Middletown, CT
USDA Zone 6bMiddletown, 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 Middletown sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
MERIDEN MARKHAM MUNI 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 Middletown’s own odds, recorded at MERIDEN MARKHAM MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 21 | May 7 | Apr 24 | Sep 26 | Oct 6 | Oct 19 |
| 32°F | May 9 | Apr 26 | Apr 11 | Oct 4 | Oct 16 | Nov 1 |
| 28°F | Apr 28 | Apr 10 | Mar 30 | Oct 14 | Oct 30 | 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 Middletown, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
Middletown planting FAQ
When is the last spring frost in Middletown, CT?
Plan for the last spring frost in Middletown around April 26 (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 Middletown, CT?
The first fall frost in Middletown typically arrives around October 16 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Middletown in?
Middletown 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 Middletown?
There are roughly 173 frost-free days in Middletown (a moderate growing season), running from the average last frost around April 26 to the first fall frost near October 16.
When should I plant tomatoes in Middletown?
In Middletown, start tomato seeds indoors around March 1–March 15, then transplant seedlings outdoors around May 3 once the danger of frost has passed.
Never miss a window in Middletown
An email when it’s time to start seeds, transplant, and sow — timed to Middletown’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Meriden · 12 km
- Newington · 17 km
- Wethersfield · 17 km
- Wallingford Center · 17 km
- New Britain · 18 km
- East Hartford · 24 km
- Hartford · 24 km
- North Haven · 25 km
Frost dates recorded at MERIDEN MARKHAM MUNI AP, 15 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 Middletown, CT — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00054788. Retrieved from https://blissgarden.com/connecticut/middletown.