Cle Elum, WA 98941 Frost Dates
Cle Elum, WA: when does the frost end?
Around 05/13 is the usual last spring frost, about 258 days away. Fall's first freeze usually shows up around 09/25, roughly 132 days after the last spring frost.
Zone 7a (0 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 Cle Elum, not a forecast for this year.
Stretching the season past the first frost
With roughly 4 weeks until Cle Elum's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/13 isn't a guarantee
05/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Cle Elum against the rest of the dataset
About 132 days separate Cle Elum's last and first frost, putting it 38,201 of 40,283 ZIP codes nationally. Within WA, it ranks 638 of 700.
Learn more
Before leaning on 98941's figures: zone vs. frost date explains why Zone 7a and Cle Elum's frost date answer different questions, while the frost range explains how to read the range around Cle Elum's dates instead of trusting one.