Seibert, CO 80812 Frost Dates
80812, near Seibert, CO: the frost window
The last spring frost here typically falls around 05/03, about 248 days from today. Fall's first freeze usually shows up around 10/09, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Seibert 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
Seibert's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Seibert against the rest of the dataset
Seibert's growing season runs about 158 days, ranking 33,154 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 171 of 624.
Learn more
Two guides worth reading on 80812: the frost range, on how to read the range around Seibert's dates instead of trusting one, and local microclimates, on what one yard in Seibert can differ from the 80812 normal.