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.

IssuedProductOfficeCountiesLasted
May 19, 1:59 PM MDTFrost AdvisoryBOUArapahoe, Douglas, Elbert, Lincoln18 hr
May 19, 2:10 PM MDTFrost AdvisoryPUBEl Paso18 hr
Sep 13, 1:29 AM MDTFrost AdvisoryPUBAlamosa, Conejos, Costilla, Rio Grande32 hr
Sep 14, 1:35 AM MDTFrost AdvisoryPUBAlamosa, Conejos, Costilla, Rio Grande31 hr
Sep 23, 1:37 AM MDTFrost AdvisoryPUBAlamosa, Conejos, Costilla, Rio Grande, Saguache30 hr
Sep 24, 12:37 AM MDTFrost AdvisoryPUBAlamosa, Conejos, Costilla, Rio Grande, Saguache31 hr
Oct 1, 1:01 PM MDTFrost AdvisoryPUBAlamosa, Conejos, Costilla, Rio Grande20 hr
Oct 12, 4:11 AM MDTFrost AdvisoryBOULarimer, Weld28 hr
Oct 15, 12:50 PM MDTFrost AdvisoryBOUArapahoe, Douglas, Elbert, Lincoln, Weld43 hr
Oct 16, 2:03 PM MDTFrost AdvisoryPUBEl Paso19 hr
Oct 17, 1:34 PM MDTFrost AdvisoryBOUAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 1 more42 hr
Oct 18, 12:42 AM MDTFrost AdvisoryPUBBaca, Custer, Fremont, Las Animas, Teller32 hr
Oct 20, 2:05 PM MDTFrost AdvisoryPUBCuster, Fremont, Teller18 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

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.