Mitchell, OR 97750 Frost Dates
Mitchell, OR: when does the frost end?
Typically, the last spring freeze lands around 05/22, roughly 267 days out. Fall's first freeze usually shows up around 10/04, roughly 135 days after the last spring frost.
Mitchell sits in USDA Zone 7a (0 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.
Stretching the season past the first frost
With roughly 5 weeks until Mitchell's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Mitchell's last frost
05/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/11 and only about 1 year in 10 sees frost after that.
Mitchell against the rest of the dataset
About 135 days separate Mitchell's last and first frost, putting it 37,931 of 40,283 ZIP codes nationally. Within OR, it ranks 385 of 463.
Learn more
Before leaning on 97750's figures: zone vs. frost date explains why Zone 7a and Mitchell's frost date answer different questions, while the frost range explains how to read the range around Mitchell's dates instead of trusting one.