Bonanza, OR 97639 Frost Dates
Frost dates for Bonanza, OR, ZIP 97639
The last spring frost here typically falls around 05/31, about 276 days from today. The first fall frost typically arrives around 09/21, about 114 frost-free days later.
Bonanza sits in USDA Zone 6a (-10 to -5°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 6a 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 39,372 of 40,283 ZIP codes nationally. Within OR, it ranks 394 of 463.
Learn more
the frost range explains how to read the range around Bonanza's dates instead of trusting one, and local microclimates explains what one yard in Bonanza can differ from the 97639 normal.