Holly, CO 81047 Frost Dates
When can you plant in Holly, CO?
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/12, about 163 frost-free days later.
Holly sits in USDA Zone 6a (-10 to -5°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
About 6 weeks of growing season left in Holly before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 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 Holly compares
Holly's growing season runs about 163 days, ranking 31,485 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 69 of 624.
Learn more
zone vs. frost date covers why Zone 6a and Holly's frost date answer different questions. the frost range covers how to read the range around Holly's dates instead of trusting one.