Lone Tree, CO 80130 Frost Dates
80130, near Lone Tree, CO: the frost window
Typically, the last spring freeze lands around 05/05, roughly 250 days out. Fall's first freeze usually shows up around 10/08, roughly 154 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Lone Tree 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
Lone Tree'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 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 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.
Lone Tree against the rest of the dataset
At roughly 154 frost-free days, Lone Tree places 34,234 of 40,283 ZIP codes in this dataset. Within CO, it ranks 265 of 624.
Learn more
Two guides worth reading on 80130: the frost range, on how to read the range around Lone Tree's dates instead of trusting one, and local microclimates, on what one yard in Lone Tree can differ from the 80130 normal.