Ault, CO 80610 Frost Dates
80610, near Ault, CO: the frost window
Around 05/13 is the usual last spring frost, about 258 days away. Fall's first freeze usually shows up around 09/27, roughly 136 days after the last spring frost.
Zone 5a (-20 to -15°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 Ault, not a forecast for this year.
Stretching the season past the first frost
Ault's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/13 isn't a guarantee
05/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Ault against the rest of the dataset
About 136 days separate Ault's last and first frost, putting it 37,687 of 40,283 ZIP codes nationally. Within CO, it ranks 416 of 624.
Learn more
Two guides worth reading on 80610: the frost range, on how to read the range around Ault's dates instead of trusting one, and local microclimates, on what one yard in Ault can differ from the 80610 normal.