National Weather ServiceIdahoFrost AdvisoryArchive to October 1, 2026
Frost Advisories in Idaho
The National Weather Service issued 23 frost advisories for Idaho in 2025 and 9 a year on average in 2008-2025; in 2021-2025 it had the 20th most of any state. 2026 through September: 22, 198% above the average of 7 for those months in 2008-2025. Upper Snake River Plain was covered most often (94 times since 2008).
How many frost advisories does Idaho get?
Every frost advisory that covered part of Idaho. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 22 |
| 2025 | 23 |
| 2024 | 28 |
| 2023 | 12 |
| 2022 | 11 |
| 2021 | 15 |
| 2020 | 17 |
| 2019 | 2 |
| 2018 | 8 |
| 2017 | 6 |
| 2016 | 9 |
| 2015 | 3 |
| 2014 | 10 |
| 2013 | 6 |
| 2012 | 2 |
| 2011 | 4 |
| 2010 | 8 |
| 2009 | 3 |
| 2008 | 2 |
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 | 94 | 36 | September 15, 2026 |
| Lower Snake River Plain | 91 | 28 | September 15, 2026 |
| Eastern Magic Valley | 65 | 26 | June 11, 2026 |
| Arco/Mud Lake Desert | 60 | 38 | September 15, 2026 |
| Shoshone/Lava Beds | 53 | 32 | September 15, 2026 |
| Lower Treasure Valley | 14 | 3 | October 17, 2025 |
| Upper Treasure Valley | 14 | 3 | October 17, 2025 |
| Western Magic Valley | 14 | 5 | May 19, 2026 |
| Idaho Palouse | 11 | 7 | September 27, 2026 |
| Eastern Lemhi County | 10 | 8 | June 11, 2026 |
| Northern Panhandle | 10 | 7 | June 8, 2026 |
| Orofino/Grangeville Region | 10 | 6 | June 8, 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 Idaho.