Wiley, CO 81092 Frost Dates
When can you plant in Wiley, CO?
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/07, about 157 frost-free days later.
The USDA Plant Hardiness Zone Map puts Wiley in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 6 weeks of growing season left in Wiley before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Wiley compares
At roughly 157 frost-free days, Wiley places 33,430 of 40,283 ZIP codes in this dataset. Within CO, it ranks 180 of 624.
Learn more
local microclimates covers what one yard in Wiley can differ from the 81092 normal. zone vs. frost date covers why Zone 6a and Wiley's frost date answer different questions.