Prineville, OR 97752 Frost Dates
97752, near Prineville, OR: the frost window
Around 06/02 is the usual last spring frost, about 278 days away. Fall's first freeze usually shows up around 09/17, roughly 104 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Prineville in Zone 6a (-10 to -5°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
Prineville'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
06/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/25 and only about 1 year in 10 sees frost after that.
Prineville against the rest of the dataset
Prineville's growing season runs about 104 days, ranking 39,605 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 408 of 463.
Learn more
Two guides worth reading on 97752: zone vs. frost date, on why Zone 6a and Prineville's frost date answer different questions, and the frost range, on how to read the range around Prineville's dates instead of trusting one.