Klamath Falls, OR 97601 Frost Dates
97601, near Klamath Falls, OR: the frost window
The last spring frost here typically falls around 06/09, about 285 days from today. Fall's first freeze usually shows up around 09/18, roughly 99 days after the last spring frost.
Klamath Falls sits in USDA Zone 7a (0 to 5°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
Klamath Falls's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 06/09 isn't a guarantee
06/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/26 and only about 1 year in 10 sees frost after that.
Klamath Falls against the rest of the dataset
At roughly 99 frost-free days, Klamath Falls places 39,729 of 40,283 ZIP codes in this dataset. Within OR, it ranks 411 of 463.
Learn more
Two guides worth reading on 97601: zone vs. frost date, on why Zone 7a and Klamath Falls's frost date answer different questions, and the frost range, on how to read the range around Klamath Falls's dates instead of trusting one.