Calhan, CO 80864 Frost Dates
Calhan, CO: when does the frost end?
The last spring frost here typically falls around 05/09, about 254 days from today. Fall's first freeze usually shows up around 10/04, roughly 146 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 Calhan, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Calhan's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Calhan's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Calhan against the rest of the dataset
At roughly 146 frost-free days, Calhan places 36,081 of 40,283 ZIP codes in this dataset. Within CO, it ranks 362 of 624.
Learn more
Before leaning on 80864's figures: local microclimates explains what one yard in Calhan can differ from the 80864 normal, while zone vs. frost date explains why Zone 6a and Calhan's frost date answer different questions.