Blanca, CO 81123 Frost Dates
Frost dates for Blanca, CO, ZIP 81123
The last spring frost here typically falls around 06/07, about 283 days from today. The first fall frost typically arrives around 09/15, about 98 frost-free days later.
Zone 5a (-20 to -15°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 Blanca, not a forecast for this year.
What to do before the first frost
Zone 5a around Blanca has about 3 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Blanca's last frost
06/07 is the middle of 30 years of NOAA records, not a promise. Plant by 05/24 and you're betting against frost in roughly 9 years out of 10. 06/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Blanca compares
About 98 days separate Blanca's last and first frost, putting it 39,766 of 40,283 ZIP codes nationally. Within CO, it ranks 533 of 624.
Learn more
the frost range explains how to read the range around Blanca's dates instead of trusting one, and local microclimates explains what one yard in Blanca can differ from the 81123 normal.