Crook, CO 80726 Frost Dates
Crook, CO: when does the frost end?
Around 05/11 is the usual last spring frost, about 256 days away. Fall's first freeze usually shows up around 10/04, roughly 145 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Crook in Zone 5b (-15 to -10°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
With roughly 5 weeks until Crook's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/11 isn't a guarantee
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Crook against the rest of the dataset
At roughly 145 frost-free days, Crook places 36,303 of 40,283 ZIP codes in this dataset. Within CO, it ranks 373 of 624.
Learn more
Before leaning on 80726's figures: local microclimates explains what one yard in Crook can differ from the 80726 normal, while zone vs. frost date explains why Zone 5b and Crook's frost date answer different questions.