Platteville, CO 80651 Frost Dates
Frost dates for Platteville, CO, ZIP 80651
Typically, the last spring freeze lands around 05/02, roughly 247 days out. The first fall frost typically arrives around 10/08, about 159 frost-free days later.
Zone 5b (-15 to -10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Platteville, not a forecast for this year.
What to do before the first frost
Zone 5b around Platteville 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.
The actual range around Platteville's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Platteville compares
Platteville's growing season runs about 159 days, ranking 32,657 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 116 of 624.
Learn more
zone vs. frost date explains why Zone 5b and Platteville's frost date answer different questions, and the frost range explains how to read the range around Platteville's dates instead of trusting one.