Summerville, OR 97876 Frost Dates
97876, near Summerville, OR: the frost window
Typically, the last spring freeze lands around 05/06, roughly 251 days out. Fall's first freeze usually shows up around 10/01, roughly 146 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Summerville in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Summerville's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Summerville against the rest of the dataset
Summerville's growing season runs about 146 days, ranking 36,140 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 360 of 463.
Learn more
Two guides worth reading on 97876: the frost range, on how to read the range around Summerville's dates instead of trusting one, and local microclimates, on what one yard in Summerville can differ from the 97876 normal.