Mountain View, CO 80211 Frost Dates
80211, near Mountain View, CO: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/12, roughly 165 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mountain View in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Mountain View'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.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Mountain View against the rest of the dataset
At roughly 165 frost-free days, Mountain View places 30,697 of 40,283 ZIP codes in this dataset. Within CO, it ranks 63 of 624.
Learn more
Two guides worth reading on 80211: local microclimates, on what one yard in Mountain View can differ from the 80211 normal, and zone vs. frost date, on why Zone 6a and Mountain View's frost date answer different questions.