Wiley, CO 81044 Frost Dates
81044, near Wiley, CO: the frost window
Around 04/24 is the usual last spring frost, about 239 days away. Fall's first freeze usually shows up around 10/15, roughly 172 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 Wiley, not a forecast for this year.
Stretching the season past the first frost
Wiley's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Wiley against the rest of the dataset
Wiley's growing season runs about 172 days, ranking 28,458 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 16 of 624.
Learn more
Two guides worth reading on 81044: the frost range, on how to read the range around Wiley's dates instead of trusting one, and local microclimates, on what one yard in Wiley can differ from the 81044 normal.