Colorado frost dates by county and ZIP code
Across 528 Colorado ZIP codes the average last spring frost runs Apr 17 to Jun 21 and the average first fall frost Sep 2 to Oct 26 (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.
Plants for Colorado
Colorado's university or garden plant program: Plant Select®, with a link to the official list. Not affiliated. All state plant programs.
Counties
- Adams
- Alamosa
- Arapahoe
- Archuleta
- Baca
- Bent
- Boulder
- Broomfield
- Chaffee
- Cheyenne
- Clear Creek
- Conejos
- Costilla
- Crowley
- Custer
- Delta
- Denver
- Dolores
- Douglas
- Eagle
- El Paso
- Elbert
- Fremont
- Garfield
- Gilpin
- Grand
- Gunnison
- Hinsdale
- Huerfano
- Jackson
- Jefferson
- Kiowa
- Kit Carson
- La Plata
- Lake
- Larimer
- Las Animas
- Lincoln
- Logan
- Mesa
- Mineral
- Moffat
- Montezuma
- Montrose
- Morgan
- Otero
- Ouray
- Park
- Phillips
- Pitkin
- Prowers
- Pueblo
- Rio Blanco
- Rio Grande
- Routt
- Saguache
- San Juan
- San Miguel
- Sedgwick
- Summit
- Teller
- Washington
- Weld
- Yuma
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