Aurora, CO 80018 Frost Dates
80018, near Aurora, CO: the frost window
Typically, the last spring freeze lands around 05/07, roughly 252 days out. Fall's first freeze usually shows up around 10/08, roughly 152 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Aurora in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's 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.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Aurora against the rest of the dataset
Aurora's growing season runs about 152 days, ranking 34,668 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 286 of 624.
Learn more
Two guides worth reading on 80018: 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.