National Weather ServiceConnecticutFrost AdvisoryArchive to October 1, 2026
Frost Advisories in Connecticut
The National Weather Service issued 11 frost advisories for Connecticut in 2025 and 12 a year on average in 2008-2025; in 2021-2025 it had the 32nd most of any state. 2026 through September: 5, 14% below the average of 6 for those months in 2008-2025. Northern Fairfield was covered most often (63 times since 2008).
How many frost advisories does Connecticut get?
Every frost advisory that covered part of Connecticut. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 5 |
| 2025 | 11 |
| 2024 | 17 |
| 2023 | 5 |
| 2022 | 18 |
| 2021 | 4 |
| 2020 | 19 |
| 2019 | 11 |
| 2018 | 4 |
| 2017 | 9 |
| 2016 | 18 |
| 2015 | 3 |
| 2014 | 8 |
| 2013 | 16 |
| 2012 | 4 |
| 2011 | 12 |
| 2010 | 29 |
| 2009 | 15 |
| 2008 | 13 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Connecticut get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Connecticut?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Northern Fairfield | 63 | 15 | May 3, 2026 |
| Northern New Haven | 59 | 12 | May 3, 2026 |
| Tolland | 56 | 4 | April 27, 2024 |
| Northern Middlesex | 55 | 8 | April 25, 2026 |
| Southern Litchfield | 53 | 7 | May 3, 2026 |
| Northern New London | 52 | 8 | April 25, 2026 |
| Windham | 52 | 4 | April 27, 2024 |
| Hartford | 50 | 4 | April 27, 2024 |
| Northern Litchfield | 48 | 9 | May 3, 2026 |
| Southern Middlesex | 38 | 11 | April 20, 2026 |
| Southern New London | 36 | 11 | April 20, 2026 |
| Southern New Haven | 35 | 9 | April 20, 2026 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
What is a frost advisory?
A frost advisory means frost is expected on clear, calm nights during the growing season, with temperatures a few degrees above freezing. An advisory is issued for a hazard less serious than a warning that can still cause inconvenience or danger if people are not careful. The national record · Every warning type in Connecticut.