Boone, CO 81025 Frost Dates
Boone, CO: when does the frost end?
The last spring frost here typically falls around 05/05, about 250 days from today. Fall's first freeze usually shows up around 10/06, roughly 153 days after the last spring frost.
Boone 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.
Stretching the season past the first frost
With roughly 6 weeks until Boone's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Boone against the rest of the dataset
Boone's growing season runs about 153 days, ranking 34,627 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 283 of 624.
Learn more
Before leaning on 81025's figures: local microclimates explains what one yard in Boone can differ from the 81025 normal, while zone vs. frost date explains why Zone 6a and Boone's frost date answer different questions.