Prineville, OR 97754 Frost Dates
Prineville, OR: when does the frost end?
The last spring frost here typically falls around 06/09, about 285 days from today. Fall's first freeze usually shows up around 09/14, roughly 98 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Prineville in Zone 6b (-5 to 0°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
With roughly 2 weeks until Prineville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Prineville's last frost
06/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/26 and only about 1 year in 10 sees frost after that.
Prineville against the rest of the dataset
At roughly 98 frost-free days, Prineville places 39,751 of 40,283 ZIP codes in this dataset. Within OR, it ranks 421 of 463.
Learn more
Before leaning on 97754's figures: zone vs. frost date explains why Zone 6b and Prineville's frost date answer different questions, while the frost range explains how to read the range around Prineville's dates instead of trusting one.