Eugene, OR 97403 Frost Dates
Eugene, OR: when does the frost end?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. Fall's first freeze usually shows up around 10/23, roughly 196 days after the last spring frost.
Zone 8b (15 to 20°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 Eugene, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Eugene's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Eugene against the rest of the dataset
At roughly 196 frost-free days, Eugene places 18,898 of 40,283 ZIP codes in this dataset. Within OR, it ranks 243 of 463.
Learn more
Before leaning on 97403's figures: the frost range explains how to read the range around Eugene's dates instead of trusting one, while local microclimates explains what one yard in Eugene can differ from the 97403 normal.