Ignacio, CO 81137 Frost Dates
Frost dates for Ignacio, CO, ZIP 81137
Around 05/23 is the usual last spring frost, about 268 days away. The first fall frost typically arrives around 09/29, about 128 frost-free days later.
The USDA Plant Hardiness Zone Map puts Ignacio in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6a around Ignacio has about 5 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
05/23 is the middle of 30 years of NOAA records, not a promise. Plant by 05/09 and you're betting against frost in roughly 9 years out of 10. 06/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ignacio compares
At roughly 128 frost-free days, Ignacio places 38,555 of 40,283 ZIP codes in this dataset. Within CO, it ranks 445 of 624.
Learn more
local microclimates explains what one yard in Ignacio can differ from the 81137 normal, and zone vs. frost date explains why Zone 6a and Ignacio's frost date answer different questions.