Florence, CO 81240 Frost Dates
Florence, CO: when does the frost end?
Typically, the last spring freeze lands around 05/04, roughly 249 days out. Fall's first freeze usually shows up around 10/07, roughly 153 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Florence in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 6 weeks until Florence's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Florence against the rest of the dataset
Florence's growing season runs about 153 days, ranking 34,533 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 274 of 624.
Learn more
Before leaning on 81240's figures: the frost range explains how to read the range around Florence's dates instead of trusting one, while local microclimates explains what one yard in Florence can differ from the 81240 normal.