Columbine Valley, CO 80128 Frost Dates
80128, near Columbine Valley, CO: the frost window
Around 05/02 is the usual last spring frost, about 247 days away. Fall's first freeze usually shows up around 10/11, roughly 160 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Columbine Valley, not a forecast for this year.
Stretching the season past the first frost
Columbine Valley's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Columbine Valley against the rest of the dataset
Columbine Valley's growing season runs about 160 days, ranking 32,397 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 103 of 624.
Learn more
Two guides worth reading on 80128: the frost range, on how to read the range around Columbine Valley's dates instead of trusting one, and local microclimates, on what one yard in Columbine Valley can differ from the 80128 normal.