Klamath Falls, OR 97634 Frost Dates
97634, 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.
The USDA Plant Hardiness Zone Map puts Klamath Falls 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
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.
How much risk comes with planting early here
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
Klamath Falls's growing season runs about 99 days, ranking 39,731 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 413 of 463.
Learn more
Two guides worth reading on 97634: local microclimates, on what one yard in Klamath Falls can differ from the 97634 normal, and zone vs. frost date, on why Zone 6b and Klamath Falls's frost date answer different questions.