Pierce, CO 80650 Frost Dates
Pierce, CO: when does the frost end?
Around 05/13 is the usual last spring frost, about 258 days away. Fall's first freeze usually shows up around 09/27, roughly 136 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 Pierce, not a forecast for this year.
Stretching the season past the first frost
With roughly 4 weeks until Pierce's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Pierce's last frost
05/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Pierce against the rest of the dataset
At roughly 136 frost-free days, Pierce places 37,717 of 40,283 ZIP codes in this dataset. Within CO, it ranks 419 of 624.
Learn more
Before leaning on 80650's figures: zone vs. frost date explains why Zone 5b and Pierce's frost date answer different questions, while the frost range explains how to read the range around Pierce's dates instead of trusting one.