Marble, CO 81434 Frost Dates
81434, near Marble, 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 10/12, roughly 159 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Marble 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
Marble'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.
The actual range around Marble's last frost
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 05/18 and only about 1 year in 10 sees frost after that.
Marble against the rest of the dataset
At roughly 159 frost-free days, Marble places 32,798 of 40,283 ZIP codes in this dataset. Within CO, it ranks 132 of 624.
Learn more
Two guides worth reading on 81434: local microclimates, on what one yard in Marble can differ from the 81434 normal, and zone vs. frost date, on why Zone 6a and Marble's frost date answer different questions.