Bayfield, CO 81122 Frost Dates
Frost dates for Bayfield, CO, ZIP 81122
Around 05/31 is the usual last spring frost, about 276 days away. The first fall frost typically arrives around 09/26, about 119 frost-free days later.
Zone 6a (-10 to -5°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 Bayfield, not a forecast for this year.
What to do before the first frost
Zone 6a around Bayfield has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/16 and you're betting against frost in roughly 9 years out of 10. 06/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bayfield compares
Bayfield's growing season runs about 119 days, ranking 39,144 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 467 of 624.
Learn more
the frost range explains how to read the range around Bayfield's dates instead of trusting one, and local microclimates explains what one yard in Bayfield can differ from the 81122 normal.