Loveland, CO 80537 Frost Dates
Frost dates for Loveland, CO, ZIP 80537
Around 05/10 is the usual last spring frost, about 255 days away. The first fall frost typically arrives around 10/01, about 142 frost-free days later.
The USDA Plant Hardiness Zone Map puts Loveland in Zone 5b (-15 to -10°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 5b around Loveland 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.
Why 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Loveland compares
Loveland's growing season runs about 142 days, ranking 36,697 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 386 of 624.
Learn more
local microclimates explains what one yard in Loveland can differ from the 80537 normal, and zone vs. frost date explains why Zone 5b and Loveland's frost date answer different questions.