Checking current alerts… View NWS forecast and alerts.
Will it freeze in Waterbury in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Wed, Nov 11: 31°F (Wed, Nov 11, 6:00 PM EST to Thu, Nov 12, 6:00 AM EST).
Tonight: forecast low 60°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 60°F Above 36°F · Light Rain Likely
- Fri, Nov 6 52°F Above 36°F · Light Rain
- Sat, Nov 7 42°F Above 36°F · Chance Light Rain
- Sun, Nov 8 37°F Above 36°F · Mostly Clear
- Mon, Nov 9 35°F Frost possible · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 31°F Freeze · 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 Waterbury
The median first fall hard-freeze date (28°F) is October 30, from NOAA’s 1991–2020 Climate Normals at Meriden Markham 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 24 · May 7 · May 21 | Sep 26 · Oct 6 · Oct 19 | 152 days |
| 32°F freeze | Apr 11 · Apr 26 · May 9 | Oct 4 · Oct 16 · Nov 1 | 175 days |
| 28°F hard freeze | Mar 30 · Apr 10 · Apr 28 | Oct 14 · Oct 30 · Nov 12 | 198 days |
Average high temperature by month
1991–2020 normals at Meriden Markham 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 Waterbury, CT come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Meriden Markham Municipal Airport (station USW00054788, elevation 103 ft), 11 mi from Waterbury. 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 Waterbury
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Naugatuck, CT | 5.0 mi | Apr 18 | Oct 26 |
| Bristol, CT | 9.9 mi | Apr 25 | Oct 18 |
| Meriden, CT | 12 mi | Apr 26 | Oct 16 |
| Ansonia, CT | 15 mi | Apr 25 | Oct 17 |
| New Britain, CT | 16 mi | Apr 17 | Oct 26 |
| Derby, CT | 16 mi | Apr 25 | Oct 17 |
| New Haven, CT | 18 mi | Apr 17 | Oct 27 |
| Shelton, CT | 19 mi | Apr 25 | Oct 17 |
| Middletown, CT | 20 mi | Apr 26 | Oct 16 |
| Torrington, CT | 20 mi | May 8 | Oct 5 |
Frequently asked questions
When is the last frost in Waterbury?
On average, the last spring frost (32°F) in Waterbury is around April 26. In about 1 year in 10 it comes after May 9, and in 9 years in 10 it comes after April 11.
When is the first frost in Waterbury?
The first fall frost (32°F) usually arrives around October 16. There’s a 10% chance of a freeze by October 4 and a 90% chance by November 1.
Can it frost in Waterbury 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 7.
What growing zone is Waterbury?
Waterbury 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 06702. See growing zones in Connecticut.
More: all Connecticut frost dates · Connecticut growing zones · UV index today in Waterbury · frost vs. freeze