Parker, CO 80138 Frost Dates
80138, near Parker, CO: the frost window
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 10/03, roughly 145 days after the last spring frost.
Parker sits in USDA Zone 5b (-15 to -10°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
Parker's growing season runs out in roughly 5 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
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Parker against the rest of the dataset
About 145 days separate Parker's last and first frost, putting it 36,158 of 40,283 ZIP codes nationally. Within CO, it ranks 369 of 624.
Learn more
Two guides worth reading on 80138: the frost range, on how to read the range around Parker's dates instead of trusting one, and local microclimates, on what one yard in Parker can differ from the 80138 normal.