Berthoud, CO 80513 Frost Dates
Frost dates for Berthoud, CO, ZIP 80513
The last spring frost here typically falls around 05/10, about 255 days from today. The first fall frost typically arrives around 10/01, about 142 frost-free days later.
The USDA Plant Hardiness Zone Map puts Berthoud 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 Berthoud 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 Berthoud compares
Berthoud's growing season runs about 142 days, ranking 36,713 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 389 of 624.
Learn more
the frost range explains how to read the range around Berthoud's dates instead of trusting one, and local microclimates explains what one yard in Berthoud can differ from the 80513 normal.