Fountain, CO 80928 Frost Dates
80928, near Fountain, CO: the frost window
Around 05/03 is the usual last spring frost, about 248 days away. Fall's first freeze usually shows up around 10/08, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Fountain 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
Fountain'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 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Fountain against the rest of the dataset
At roughly 158 frost-free days, Fountain places 32,906 of 40,283 ZIP codes in this dataset. Within CO, it ranks 166 of 624.
Learn more
Two guides worth reading on 80928: zone vs. frost date, on why Zone 6a and Fountain's frost date answer different questions, and the frost range, on how to read the range around Fountain's dates instead of trusting one.