Green Mountain Falls, CO 80809 Frost Dates
80809, near Green Mountain Falls, CO: the frost window
The last spring frost here typically falls around 06/03, about 279 days from today. Fall's first freeze usually shows up around 09/17, roughly 102 days after the last spring frost.
Zone 5b (-15 to -10°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 Green Mountain Falls, not a forecast for this year.
Stretching the season past the first frost
Green Mountain Falls's growing season runs out in roughly 3 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 Green Mountain Falls's last frost
06/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/23 and only about 1 year in 10 sees frost after that.
Green Mountain Falls against the rest of the dataset
At roughly 102 frost-free days, Green Mountain Falls places 39,667 of 40,283 ZIP codes in this dataset. Within CO, it ranks 526 of 624.
Learn more
Two guides worth reading on 80809: zone vs. frost date, on why Zone 5b and Green Mountain Falls's frost date answer different questions, and the frost range, on how to read the range around Green Mountain Falls's dates instead of trusting one.