Grover, CO 80732 Frost Dates
80732, near Grover, CO: the frost window
Around 05/14 is the usual last spring frost, about 259 days away. Fall's first freeze usually shows up around 09/26, roughly 133 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Grover in Zone 5a (-20 to -15°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
Grover's growing season runs out in roughly 4 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
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Grover against the rest of the dataset
At roughly 133 frost-free days, Grover places 38,144 of 40,283 ZIP codes in this dataset. Within CO, it ranks 434 of 624.
Learn more
Two guides worth reading on 80732: zone vs. frost date, on why Zone 5a and Grover's frost date answer different questions, and the frost range, on how to read the range around Grover's dates instead of trusting one.