Blanca, CO 81133 Frost Dates
Blanca, CO: when does the frost end?
Around 05/27 is the usual last spring frost, about 272 days away. Fall's first freeze usually shows up around 09/25, roughly 119 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Blanca 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 4 weeks until Blanca's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/10 and only about 1 year in 10 sees frost after that.
Blanca against the rest of the dataset
About 119 days separate Blanca's last and first frost, putting it 39,167 of 40,283 ZIP codes nationally. Within CO, it ranks 468 of 624.
Learn more
Before leaning on 81133's figures: zone vs. frost date explains why Zone 5b and Blanca's frost date answer different questions, while the frost range explains how to read the range around Blanca's dates instead of trusting one.