Ignacio, CO 81121 Frost Dates
Ignacio, CO: when does the frost end?
Typically, the last spring freeze lands around 05/23, roughly 268 days out. Fall's first freeze usually shows up around 09/29, roughly 128 days after the last spring frost.
Ignacio sits in USDA Zone 6b (-5 to 0°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
With roughly 5 weeks until Ignacio's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/23 isn't a guarantee
05/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/07 and only about 1 year in 10 sees frost after that.
Ignacio against the rest of the dataset
Ignacio's growing season runs about 128 days, ranking 38,554 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 444 of 624.
Learn more
Before leaning on 81121's figures: the frost range explains how to read the range around Ignacio's dates instead of trusting one, while local microclimates explains what one yard in Ignacio can differ from the 81121 normal.