Denver, CO 80216 Frost Dates
80216, near Denver, 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.
Zone 6a (-10 to -5°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 Denver, not a forecast for this year.
Stretching the season past the first frost
Denver'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.
How much risk comes with planting early here
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.
Denver against the rest of the dataset
At roughly 165 frost-free days, Denver places 30,470 of 40,283 ZIP codes in this dataset. Within CO, it ranks 37 of 624.
Learn more
Two guides worth reading on 80216: the frost range, on how to read the range around Denver's dates instead of trusting one, and local microclimates, on what one yard in Denver can differ from the 80216 normal.