Cornelius, OR 97113 Frost Dates
When can you plant in Cornelius, OR?
Typically, the last spring freeze lands around 04/16, roughly 231 days out. The first fall frost typically arrives around 10/26, about 192 frost-free days later.
Cornelius sits in USDA Zone 8b (15 to 20°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
About 8 weeks of growing season left in Cornelius before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Cornelius's last frost
04/16 is the middle of 30 years of NOAA records, not a promise. Plant by 03/26 and you're betting against frost in roughly 9 years out of 10. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cornelius compares
About 192 days separate Cornelius's last and first frost, putting it 20,202 of 40,283 ZIP codes nationally. Within OR, it ranks 271 of 463.
Learn more
zone vs. frost date covers why Zone 8b and Cornelius's frost date answer different questions. the frost range covers how to read the range around Cornelius's dates instead of trusting one.