Nunn, CO 80612 Frost Dates
Frost dates for Nunn, CO, ZIP 80612
Typically, the last spring freeze lands around 05/13, roughly 258 days out. The first fall frost typically arrives around 09/27, about 136 frost-free days later.
The USDA Plant Hardiness Zone Map puts Nunn in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 5b around Nunn has about 4 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 Nunn's last frost
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Nunn compares
About 136 days separate Nunn's last and first frost, putting it 37,760 of 40,283 ZIP codes nationally. Within CO, it ranks 420 of 624.
Learn more
local microclimates explains what one yard in Nunn can differ from the 80612 normal, and zone vs. frost date explains why Zone 5b and Nunn's frost date answer different questions.