Bonanza, OR 97622 Frost Dates
Frost dates for Bonanza, OR, ZIP 97622
Typically, the last spring freeze lands around 05/31, roughly 276 days out. The first fall frost typically arrives around 09/21, about 114 frost-free days later.
Bonanza sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6b around Bonanza has about 3 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Bonanza's last frost
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 06/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bonanza compares
About 114 days separate Bonanza's last and first frost, putting it 39,370 of 40,283 ZIP codes nationally. Within OR, it ranks 392 of 463.
Learn more
local microclimates explains what one yard in Bonanza can differ from the 97622 normal, and zone vs. frost date explains why Zone 6b and Bonanza's frost date answer different questions.