Julesburg, CO 80737 Frost Dates
Frost dates for Julesburg, CO, ZIP 80737
Around 05/07 is the usual last spring frost, about 252 days away. The first fall frost typically arrives around 10/06, about 152 frost-free days later.
Julesburg sits in USDA Zone 5b (-15 to -10°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 5b around Julesburg 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 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 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 Julesburg compares
Julesburg's growing season runs about 152 days, ranking 34,799 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 292 of 624.
Learn more
zone vs. frost date explains why Zone 5b and Julesburg's frost date answer different questions, and the frost range explains how to read the range around Julesburg's dates instead of trusting one.