Bethune, CO 80805 Frost Dates
Frost dates for Bethune, CO, ZIP 80805
Typically, the last spring freeze lands around 05/06, roughly 251 days out. The first fall frost typically arrives around 10/09, about 155 frost-free days later.
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 Bethune, not a forecast for this year.
What to do before the first frost
Zone 6a around Bethune has about 6 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.
How much risk comes with planting early here
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bethune compares
About 155 days separate Bethune's last and first frost, putting it 34,159 of 40,283 ZIP codes nationally. Within CO, it ranks 254 of 624.
Learn more
local microclimates explains what one yard in Bethune can differ from the 80805 normal, and zone vs. frost date explains why Zone 6a and Bethune's frost date answer different questions.