Bonanza, OR 97623 Frost Dates
Bonanza, OR: when does the frost end?
Typically, the last spring freeze lands around 05/31, roughly 276 days out. Fall's first freeze usually shows up around 09/21, roughly 114 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Bonanza 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 3 weeks until Bonanza's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/17 and only about 1 year in 10 sees frost after that.
Bonanza against the rest of the dataset
At roughly 114 frost-free days, Bonanza places 39,371 of 40,283 ZIP codes in this dataset. Within OR, it ranks 393 of 463.
Learn more
Before leaning on 97623's figures: the frost range explains how to read the range around Bonanza's dates instead of trusting one, while local microclimates explains what one yard in Bonanza can differ from the 97623 normal.