Bennett, CO 80166 Frost Dates
80166, near Bennett, CO: the frost window
The last spring frost here typically falls around 05/05, about 250 days from today. Fall's first freeze usually shows up around 10/09, roughly 156 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 Bennett, not a forecast for this year.
Stretching the season past the first frost
Bennett'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
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Bennett against the rest of the dataset
At roughly 156 frost-free days, Bennett places 33,604 of 40,283 ZIP codes in this dataset. Within CO, it ranks 217 of 624.
Learn more
Two guides worth reading on 80166: local microclimates, on what one yard in Bennett can differ from the 80166 normal, and zone vs. frost date, on why Zone 6a and Bennett's frost date answer different questions.