National Weather ServiceIdahoFreezing Fog AdvisoryArchive to October 1, 2026
Freezing Fog Advisories in Idaho
The National Weather Service issued 0 freezing fog advisories for Idaho in 2025 and 4 a year on average in 2008-2025; in 2021-2025 it had the 7th most of any state. 2026 through September: 0, 100% below the average of 2 for those months in 2008-2025. Upper Snake River Plain was covered most often (42 times since 2008).
How many freezing fog advisories does Idaho get?
Every freezing fog advisory that covered part of Idaho. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 0 |
| 2025 | 0 |
| 2024 | 2 |
| 2023 | 8 |
| 2022 | 11 |
| 2021 | 1 |
| 2020 | 1 |
| 2019 | 3 |
| 2018 | 1 |
| 2017 | 3 |
| 2016 | 3 |
| 2015 | 5 |
| 2014 | 4 |
| 2013 | 4 |
| 2012 | 1 |
| 2011 | 6 |
| 2010 | 5 |
| 2009 | 7 |
| 2008 | 1 |
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 Idaho 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 Idaho?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Upper Snake River Plain | 42 | 7 | December 19, 2024 |
| Lower Snake River Plain | 38 | 5 | December 16, 2023 |
| Eastern Magic Valley | 22 | 4 | December 16, 2023 |
| Upper Snake Highlands | 16 | 0 | December 14, 2017 |
| Cache Valley/Idaho Portion | 13 | 0 | December 7, 2017 |
| Arco/Mud Lake Desert | 11 | 4 | December 19, 2024 |
| Caribou Highlands | 11 | 0 | January 26, 2016 |
| Wasatch Mountains/Idaho Portion | 10 | 0 | January 26, 2016 |
| Teton Valley | 9 | 2 | February 7, 2023 |
| Raft River Region | 8 | 4 | December 15, 2023 |
| Marsh and Arbon Highlands | 7 | 5 | December 16, 2023 |
| Bear Lake Valley | 6 | 3 | December 16, 2023 |
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 freezing fog advisory?
A freezing fog advisory means fog will freeze on roads, bridges and other surfaces, making them slippery while it cuts visibility. 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 Idaho.