Avon, CO 80423 Frost Dates
80423, near Avon, CO: the frost window
Around 06/14 is the usual last spring frost, about 290 days away. Fall's first freeze usually shows up around 09/05, roughly 80 days after the last spring frost.
Zone 5b (-15 to -10°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 Avon, not a forecast for this year.
Stretching the season past the first frost
Avon's growing season runs out in roughly 1 week — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
06/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 06/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/30 and only about 1 year in 10 sees frost after that.
Avon against the rest of the dataset
About 80 days separate Avon's last and first frost, putting it 40,043 of 40,283 ZIP codes nationally. Within CO, it ranks 567 of 624.
Learn more
Two guides worth reading on 80423: zone vs. frost date, on why Zone 5b and Avon's frost date answer different questions, and the frost range, on how to read the range around Avon's dates instead of trusting one.