Bow Mar, CO 80127 Frost Dates
Bow Mar, CO: when does the frost end?
Typically, the last spring freeze lands around 05/02, roughly 247 days out. Fall's first freeze usually shows up around 10/11, roughly 160 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 Bow Mar, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Bow Mar's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Bow Mar's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Bow Mar against the rest of the dataset
At roughly 160 frost-free days, Bow Mar places 32,452 of 40,283 ZIP codes in this dataset. Within CO, it ranks 105 of 624.
Learn more
Before leaning on 80127's figures: zone vs. frost date explains why Zone 5b and Bow Mar's frost date answer different questions, while the frost range explains how to read the range around Bow Mar's dates instead of trusting one.