Alert archive / Colorado / Frost Advisories
Frost Advisories in Colorado, 2025
13 frost advisories in 2025. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of frost advisories reaches back to 2005.
Frost Advisories by county
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Frost Advisories
- 13
- Busiest month
- October7 frost advisories
- Busiest day
- May 19, 20252 frost advisories
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 1:59 PM MDT | Frost Advisory | BOU | Arapahoe, Douglas, Elbert, Lincoln | 18 hr |
| May 19, 2:10 PM MDT | Frost Advisory | PUB | El Paso | 18 hr |
| Sep 13, 1:29 AM MDT | Frost Advisory | PUB | Alamosa, Conejos, Costilla, Rio Grande | 32 hr |
| Sep 14, 1:35 AM MDT | Frost Advisory | PUB | Alamosa, Conejos, Costilla, Rio Grande | 31 hr |
| Sep 23, 1:37 AM MDT | Frost Advisory | PUB | Alamosa, Conejos, Costilla, Rio Grande, Saguache | 30 hr |
| Sep 24, 12:37 AM MDT | Frost Advisory | PUB | Alamosa, Conejos, Costilla, Rio Grande, Saguache | 31 hr |
| Oct 1, 1:01 PM MDT | Frost Advisory | PUB | Alamosa, Conejos, Costilla, Rio Grande | 20 hr |
| Oct 12, 4:11 AM MDT | Frost Advisory | BOU | Larimer, Weld | 28 hr |
| Oct 15, 12:50 PM MDT | Frost Advisory | BOU | Arapahoe, Douglas, Elbert, Lincoln, Weld | 43 hr |
| Oct 16, 2:03 PM MDT | Frost Advisory | PUB | El Paso | 19 hr |
| Oct 17, 1:34 PM MDT | Frost Advisory | BOU | Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 1 more | 42 hr |
| Oct 18, 12:42 AM MDT | Frost Advisory | PUB | Baca, Custer, Fremont, Las Animas, Teller | 32 hr |
| Oct 20, 2:05 PM MDT | Frost Advisory | PUB | Custer, Fremont, Teller | 18 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Alamosa County5
- Conejos County5
- Costilla County5
- Rio Grande County5
- Arapahoe County3
- Douglas County3
- Elbert County2
- Lincoln County2
- El Paso County2
- Saguache County2
- Weld County2
- Custer County2
- Fremont County2
- Teller County2
- Larimer County1
- Adams County1
- Boulder County1
- Broomfield County1
- Denver County1
- Jefferson County1
- Baca County1
- Las Animas County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20242026
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.