National Weather ServiceCaliforniaFrost AdvisoryArchive to October 1, 2026
Frost Advisories in California
The National Weather Service issued 100 frost advisories for California in 2025 and 83 a year on average in 2008-2025; in 2021-2025 it had the 1st most of any state. 2026 through September: 29, 35% below the average of 45 for those months in 2008-2025. Mendocino Coast was covered most often (232 times since 2008).
How many frost advisories does California get?
Every frost advisory that covered part of California. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 29 |
| 2025 | 100 |
| 2024 | 100 |
| 2023 | 106 |
| 2022 | 107 |
| 2021 | 89 |
| 2020 | 78 |
| 2019 | 76 |
| 2018 | 78 |
| 2017 | 78 |
| 2016 | 55 |
| 2015 | 95 |
| 2014 | 52 |
| 2013 | 117 |
| 2012 | 97 |
| 2011 | 69 |
| 2010 | 70 |
| 2009 | 70 |
| 2008 | 54 |
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 California 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 California?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Mendocino Coast | 232 | 34 | April 17, 2026 |
| Northeastern Mendocino Interior | 175 | 50 | April 14, 2026 |
| Northwestern Mendocino Interior | 174 | 51 | April 14, 2026 |
| Northern Humboldt Coast | 153 | 39 | April 17, 2026 |
| Southwestern Mendocino Interior | 144 | 30 | April 17, 2026 |
| Southeastern Mendocino Interior | 138 | 40 | April 3, 2026 |
| Southern Humboldt Interior | 133 | 32 | April 3, 2026 |
| Southern Trinity | 110 | 42 | September 4, 2026 |
| Southwestern Humboldt | 108 | 25 | May 18, 2026 |
| Southern Lake County | 99 | 42 | April 14, 2026 |
| Mendocino Interior | 98 | 0 | April 26, 2016 |
| Northern Humboldt Interior | 98 | 22 | April 3, 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 California.