Frost dates · Colorado
Colorado counties by frost timing.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
Sorted by spring frost
Latest → earliest.
San Juan County
Spring Jun 22·Fall Sep 979-day season
Summit County
Spring Jun 18·Fall Sep 680-day season
Park County
Spring Jun 15·Fall Sep 885-day season
Lake County
Spring Jun 12·Fall Sep 1090-day season
Mineral County
Spring Jun 11·Fall Sep 1394-day season
Larimer County
Spring Jun 6·Fall Sep 14100-day season
Boulder County
Spring Jun 4·Fall Sep 14102-day season
Gunnison County
Spring Jun 4·Fall Sep 17105-day season
Moffat County
Spring Jun 1·Fall Sep 19110-day season
Eagle County
Spring May 31·Fall Sep 21113-day season
Hinsdale County
Spring May 31·Fall Sep 23115-day season
Rio Grande County
Spring May 30·Fall Sep 23116-day season
Custer County
Spring May 28·Fall Sep 20115-day season
Grand County
Spring May 26·Fall Sep 20117-day season
Ouray County
Spring May 26·Fall Sep 23120-day season
Archuleta County
Spring May 23·Fall Sep 30130-day season
Gilpin County
Spring May 21·Fall Sep 26128-day season
Rio Blanco County
Spring May 21·Fall Sep 27129-day season
Routt County
Spring May 20·Fall Sep 23126-day season
Alamosa County
Spring May 16·Fall Sep 27134-day season
Chaffee County
Spring May 15·Fall Oct 2140-day season
Clear Creek County
Spring May 15·Fall Sep 30138-day season
Teller County
Spring May 14·Fall Oct 4143-day season
Conejos County
Spring May 13·Fall Sep 29139-day season
Costilla County
Spring May 13·Fall Sep 30140-day season
Pitkin County
Spring May 13·Fall Oct 2142-day season
Montrose County
Spring May 11·Fall Oct 8150-day season
San Miguel County
Spring May 11·Fall Oct 8150-day season
Garfield County
Spring May 9·Fall Oct 4148-day season
Jefferson County
Spring May 9·Fall Oct 2146-day season
La Plata County
Spring May 7·Fall Oct 12158-day season
Saguache County
Spring May 4·Fall Oct 8157-day season
Weld County
Spring May 3·Fall Oct 5155-day season
Adams County
Spring May 2·Fall Oct 10161-day season
Arapahoe County
Spring May 2·Fall Oct 10161-day season
Dolores County
Spring May 2·Fall Oct 19170-day season
Elbert County
Spring May 2·Fall Oct 11162-day season
Douglas County
Spring May 1·Fall Oct 12164-day season
Lincoln County
Spring May 1·Fall Oct 10162-day season
Phillips County
Spring May 1·Fall Oct 12164-day season
Montezuma County
Spring Apr 30·Fall Oct 17170-day season
Washington County
Spring Apr 30·Fall Oct 15168-day season
Huerfano County
Spring Apr 29·Fall Oct 15169-day season
Otero County
Spring Apr 29·Fall Oct 11165-day season
Yuma County
Spring Apr 29·Fall Oct 15169-day season
Cheyenne County
Spring Apr 28·Fall Oct 14169-day season
Kit Carson County
Spring Apr 27·Fall Oct 19175-day season
Morgan County
Spring Apr 27·Fall Oct 15171-day season
Sedgwick County
Spring Apr 27·Fall Oct 16172-day season
Fremont County
Spring Apr 26·Fall Oct 17174-day season
Delta County
Spring Apr 25·Fall Oct 19177-day season
Baca County
Spring Apr 24·Fall Oct 19178-day season
El Paso County
Spring Apr 24·Fall Oct 16175-day season
Crowley County
Spring Apr 23·Fall Oct 16176-day season
Las Animas County
Spring Apr 23·Fall Oct 18178-day season
Denver County
Spring Apr 22·Fall Oct 18179-day season
Prowers County
Spring Apr 21·Fall Oct 21183-day season
Broomfield County
Spring Apr 20·Fall Oct 21184-day season
Kiowa County
Spring Apr 19·Fall Oct 21185-day season
Bent County
Spring Apr 18·Fall Oct 21186-day season
Logan County
Spring Apr 18·Fall Oct 18183-day season
Pueblo County
Spring Apr 18·Fall Oct 18183-day season
Mesa County
Spring Apr 8·Fall Nov 1207-day season
Alphabetical · A to Z
- Adams County
- Alamosa County
- Arapahoe County
- Archuleta County
- Baca County
- Bent County
- Boulder County
- Broomfield County
- Chaffee County
- Cheyenne County
- Clear Creek County
- Conejos County
- Costilla County
- Crowley County
- Custer County
- Delta County
- Denver County
- Dolores County
- Douglas County
- Eagle County
- El Paso County
- Elbert County
- Fremont County
- Garfield County
- Gilpin County
- Grand County
- Gunnison County
- Hinsdale County
- Huerfano County
- Jackson County
- Jefferson County
- Kiowa County
- Kit Carson County
- La Plata County
- Lake County
- Larimer County
- Las Animas County
- Lincoln County
- Logan County
- Mesa County
- Mineral County
- Moffat County
- Montezuma County
- Montrose County
- Morgan County
- Otero County
- Ouray County
- Park County
- Phillips County
- Pitkin County
- Prowers County
- Pueblo County
- Rio Blanco County
- Rio Grande County
- Routt County
- Saguache County
- San Juan County
- San Miguel County
- Sedgwick County
- Summit County
- Teller County
- Washington County
- Weld County
- Yuma County