Carlton, OR 97111 Frost Dates
97111, near Carlton, OR: the frost window
Around 04/05 is the usual last spring frost, about 220 days away. Fall's first freeze usually shows up around 11/07, roughly 216 days after the last spring frost.
Carlton sits in USDA Zone 8b (15 to 20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Carlton's growing season runs out in roughly 10 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 Carlton's last frost
04/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Carlton against the rest of the dataset
At roughly 216 frost-free days, Carlton places 13,809 of 40,283 ZIP codes in this dataset. Within OR, it ranks 185 of 463.
Learn more
Two guides worth reading on 97111: local microclimates, on what one yard in Carlton can differ from the 97111 normal, and zone vs. frost date, on why Zone 8b and Carlton's frost date answer different questions.