Estes Park, CO 80545 Frost Dates
80545, near Estes Park, CO: the frost window
Typically, the last spring freeze lands around 06/05, roughly 281 days out. Fall's first freeze usually shows up around 09/16, roughly 101 days after the last spring frost.
Estes Park sits in USDA Zone 5a (-20 to -15°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
Estes Park's growing season runs out in roughly 3 weeks — 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
06/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/20 and only about 1 year in 10 sees frost after that.
Estes Park against the rest of the dataset
About 101 days separate Estes Park's last and first frost, putting it 39,677 of 40,283 ZIP codes nationally. Within CO, it ranks 531 of 624.
Learn more
Two guides worth reading on 80545: local microclimates, on what one yard in Estes Park can differ from the 80545 normal, and zone vs. frost date, on why Zone 5a and Estes Park's frost date answer different questions.