When to plant in Danbury, CT
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Danbury, Connecticut — all computed from Danbury's nearest NOAA weather station.
Zone 6b means Danbury sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
DANBURY 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 Danbury’s own odds, recorded at DANBURY MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 27 | May 12 | Apr 30 | Sep 21 | Oct 2 | Oct 16 |
| 32°F | May 16 | May 1 | Apr 18 | Oct 1 | Oct 14 | Oct 29 |
| 28°F | May 4 | Apr 18 | Apr 3 | Oct 11 | Oct 27 | Nov 8 |
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 Danbury, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 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.
Danbury planting FAQ
When is the last spring frost in Danbury, CT?
Plan for the last spring frost in Danbury around May 1 (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 Danbury, CT?
In Danbury, the first 32°F freeze of fall lands around October 14 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Danbury in?
Danbury 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 Danbury?
There are roughly 166 frost-free days in Danbury (a moderate growing season), running from the average last frost around May 1 to the first fall frost near October 14.
When should I plant tomatoes in Danbury?
In Danbury, start tomato seeds indoors around March 6–March 20, then transplant seedlings outdoors around May 8 once the danger of frost has passed.
Never miss a window in Danbury
An email when it’s time to start seeds, transplant, and sow — timed to Danbury’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Bethel · 7 km
- Jefferson Valley-Yorktown · 28 km
- Trumbull Center · 30 km
- Shelton · 30 km
- Mount Kisco · 30 km
- Bridgeport · 33 km
- Derby · 34 km
- Norwalk · 34 km
Frost dates recorded at DANBURY MUNI 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 Danbury, CT — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00054734. Retrieved from https://blissgarden.com/connecticut/danbury.