Aurora, CO 80019 Frost Dates
Frost dates for Aurora, CO, ZIP 80019
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 10/09, about 156 frost-free days later.
Aurora sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6a around Aurora 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.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Aurora compares
At roughly 156 frost-free days, Aurora places 33,482 of 40,283 ZIP codes in this dataset. Within CO, it ranks 190 of 624.
Learn more
local microclimates explains what one yard in Aurora can differ from the 80019 normal, and zone vs. frost date explains why Zone 6a and Aurora's frost date answer different questions.