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Will it freeze in Danbury in the next 7 nights?
No overnight lows at or below 32°F are forecast in Danbury during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 59°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 59°F Above 36°F · Light Rain
- Fri, Nov 6 50°F Above 36°F · Chance Light Rain
- Sat, Nov 7 42°F Above 36°F · Chance Light Rain
- Sun, Nov 8 38°F Above 36°F · Mostly Clear
- Mon, Nov 9 36°F Frost possible · Mostly Clear
- Tue, Nov 10 37°F Above 36°F · Mostly Clear
- Wed, Nov 11 33°F Frost possible · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Danbury
The median first fall hard-freeze date (28°F) is October 27, from NOAA’s 1991–2020 Climate Normals at Danbury Municipal Airport. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 30 · May 12 · May 27 | Sep 21 · Oct 2 · Oct 16 | 143 days |
| 32°F freeze | Apr 18 · May 1 · May 16 | Oct 1 · Oct 14 · Oct 29 | 166 days |
| 28°F hard freeze | Apr 3 · Apr 18 · May 4 | Oct 11 · Oct 27 · Nov 8 | 191 days |
Average high temperature by month
1991–2020 normals at Danbury Municipal Airport
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Danbury, CT come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Danbury Municipal Airport (station USW00054734, elevation 457 ft), 1.9 mi from Danbury. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Danbury
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Shelton, CT | 19 mi | Apr 25 | Oct 17 |
| Mount Kisco, NY | 19 mi | Apr 25 | Oct 19 |
| Bridgeport, CT | 21 mi | Apr 5 | Nov 6 |
| Derby, CT | 21 mi | Apr 25 | Oct 17 |
| Norwalk, CT | 21 mi | Apr 17 | Oct 23 |
| Ansonia, CT | 22 mi | Apr 25 | Oct 17 |
| Stamford, CT | 22 mi | Apr 17 | Oct 23 |
| Naugatuck, CT | 23 mi | Apr 18 | Oct 26 |
| Pleasantville, NY | 24 mi | Apr 12 | Oct 31 |
| Peekskill, NY | 24 mi | Apr 30 | Oct 17 |
Frequently asked questions
When is the last frost in Danbury?
On average, the last spring frost (32°F) in Danbury is around May 1. In about 1 year in 10 it comes after May 16, and in 9 years in 10 it comes after April 18.
When is the first frost in Danbury?
The first fall frost (32°F) usually arrives around October 14. There’s a 10% chance of a freeze by October 1 and a 90% chance by October 29.
Can it frost in Danbury after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 12.
What growing zone is Danbury?
Danbury is in USDA Plant Hardiness Zone 6b (average annual extreme minimum temperature −5 to 0°F), based on the 2023 USDA map for ZIP code 06811. See growing zones in Connecticut.
More: all Connecticut frost dates · Connecticut growing zones · UV index today in Danbury · frost vs. freeze