Sheridan, CO 80219 Frost Dates
Frost dates for Sheridan, CO, ZIP 80219
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/12, about 165 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sheridan 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 Sheridan 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.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sheridan compares
Sheridan's growing season runs about 165 days, ranking 30,533 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 38 of 624.
Learn more
local microclimates explains what one yard in Sheridan can differ from the 80219 normal, and zone vs. frost date explains why Zone 6a and Sheridan's frost date answer different questions.