Black Hawk, CO 80422 Frost Dates
80422, near Black Hawk, CO: the frost window
The last spring frost here typically falls around 06/05, about 281 days from today. Fall's first freeze usually shows up around 09/16, roughly 103 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Black Hawk 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
Black Hawk's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
06/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/19 and only about 1 year in 10 sees frost after that.
Black Hawk against the rest of the dataset
About 103 days separate Black Hawk's last and first frost, putting it 39,634 of 40,283 ZIP codes nationally. Within CO, it ranks 518 of 624.
Learn more
Two guides worth reading on 80422: zone vs. frost date, on why Zone 5b and Black Hawk's frost date answer different questions, and the frost range, on how to read the range around Black Hawk's dates instead of trusting one.