Boone, CO 81022 Frost Dates
When can you plant in Boone, CO?
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/09, about 161 frost-free days later.
Zone 6a (-10 to -5°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 Boone, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Boone before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Boone's last frost
04/30 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. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Boone compares
Boone's growing season runs about 161 days, ranking 32,165 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 83 of 624.
Learn more
zone vs. frost date covers why Zone 6a and Boone's frost date answer different questions. the frost range covers how to read the range around Boone's dates instead of trusting one.