Unity, OR 97908 Frost Dates
97908, near Unity, OR: the frost window
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/03, roughly 147 days after the last spring frost.
Zone 6a (-10 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 Unity, not a forecast for this year.
Stretching the season past the first frost
Unity'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.
The actual range around Unity's last frost
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Unity against the rest of the dataset
Unity's growing season runs about 147 days, ranking 35,998 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 356 of 463.
Learn more
Two guides worth reading on 97908: zone vs. frost date, on why Zone 6a and Unity's frost date answer different questions, and the frost range, on how to read the range around Unity's dates instead of trusting one.