Mancos, CO 81326 Frost Dates
81326, near Mancos, CO: the frost window
Typically, the last spring freeze lands around 06/01, roughly 277 days out. Fall's first freeze usually shows up around 09/27, roughly 116 days after the last spring frost.
Mancos 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
Mancos's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 06/01 isn't a guarantee
06/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/19 and only about 1 year in 10 sees frost after that.
Mancos against the rest of the dataset
About 116 days separate Mancos's last and first frost, putting it 39,285 of 40,283 ZIP codes nationally. Within CO, it ranks 479 of 624.
Learn more
Two guides worth reading on 81326: zone vs. frost date, on why Zone 6a and Mancos's frost date answer different questions, and the frost range, on how to read the range around Mancos's dates instead of trusting one.