Aurora, CO 80137 Frost Dates
80137, near Aurora, CO: the frost window
Typically, the last spring freeze lands around 05/05, roughly 250 days out. Fall's first freeze usually shows up around 10/09, roughly 156 days after the last spring frost.
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.
Stretching the season past the first frost
Aurora's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Aurora's last frost
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Aurora against the rest of the dataset
Aurora's growing season runs about 156 days, ranking 33,483 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 191 of 624.
Learn more
Two guides worth reading on 80137: zone vs. frost date, on why Zone 6a and Aurora's frost date answer different questions, and the frost range, on how to read the range around Aurora's dates instead of trusting one.