Powers, OR 97406 Frost Dates
Powers, OR: when does the frost end?
The last spring frost here typically falls around 03/30, about 214 days from today. Fall's first freeze usually shows up around 11/17, roughly 233 days after the last spring frost.
Zone 9a (20 to 25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Powers, not a forecast for this year.
Stretching the season past the first frost
With roughly 12 weeks until Powers's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/30 isn't a guarantee
03/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/02 and only about 1 year in 10 sees frost after that.
Powers against the rest of the dataset
About 233 days separate Powers's last and first frost, putting it 9,953 of 40,283 ZIP codes nationally. Within OR, it ranks 136 of 463.
Learn more
Before leaning on 97406's figures: zone vs. frost date explains why Zone 9a and Powers's frost date answer different questions, while the frost range explains how to read the range around Powers's dates instead of trusting one.