Hillrose, CO 80733 Frost Dates
Hillrose, CO: when does the frost end?
Around 05/15 is the usual last spring frost, about 260 days away. Fall's first freeze usually shows up around 10/01, roughly 140 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hillrose in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until Hillrose's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Hillrose's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Hillrose against the rest of the dataset
Hillrose's growing season runs about 140 days, ranking 37,146 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 404 of 624.
Learn more
Before leaning on 80733's figures: zone vs. frost date explains why Zone 5b and Hillrose's frost date answer different questions, while the frost range explains how to read the range around Hillrose's dates instead of trusting one.