Halfway, OR 97840 Frost Dates
Halfway, OR: when does the frost end?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. Fall's first freeze usually shows up around 10/01, roughly 141 days after the last spring frost.
Zone 7a (0 to 5°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 Halfway, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Halfway's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/29 and only about 1 year in 10 sees frost after that.
Halfway against the rest of the dataset
Halfway's growing season runs about 141 days, ranking 36,981 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 375 of 463.
Learn more
Before leaning on 97840's figures: local microclimates explains what one yard in Halfway can differ from the 97840 normal, while zone vs. frost date explains why Zone 7a and Halfway's frost date answer different questions.