Florence, CO 81290 Frost Dates
Frost dates for Florence, CO, ZIP 81290
Typically, the last spring freeze lands around 05/04, roughly 249 days out. The first fall frost typically arrives around 10/07, about 153 frost-free days later.
Florence 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.
What to do before the first frost
Zone 6a around Florence has about 6 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
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Florence compares
Florence's growing season runs about 153 days, ranking 34,534 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 275 of 624.
Learn more
local microclimates explains what one yard in Florence can differ from the 81290 normal, and zone vs. frost date explains why Zone 6a and Florence's frost date answer different questions.