Bonanza, OR 97625 Frost Dates
97625, near Bonanza, OR: the frost window
Typically, the last spring freeze lands around 06/09, roughly 285 days out. Fall's first freeze usually shows up around 09/18, roughly 99 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Bonanza, not a forecast for this year.
Stretching the season past the first frost
Bonanza'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.
The actual range around Bonanza's last frost
06/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/22 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.
Bonanza against the rest of the dataset
About 99 days separate Bonanza's last and first frost, putting it 39,738 of 40,283 ZIP codes nationally. Within OR, it ranks 414 of 463.
Learn more
Two guides worth reading on 97625: the frost range, on how to read the range around Bonanza's dates instead of trusting one, and local microclimates, on what one yard in Bonanza can differ from the 97625 normal.