Oroville, WA 98827 Frost Dates
When can you plant in Oroville, WA?
Typically, the last spring freeze lands around 05/06, roughly 251 days out. The first fall frost typically arrives around 10/06, about 151 frost-free days later.
The USDA Plant Hardiness Zone Map puts Oroville in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 6 weeks of growing season left in Oroville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Oroville's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oroville compares
Oroville's growing season runs about 151 days, ranking 35,064 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 597 of 700.
Learn more
the frost range covers how to read the range around Oroville's dates instead of trusting one. local microclimates covers what one yard in Oroville can differ from the 98827 normal.