Reardan, WA 99040 Frost Dates
Reardan, WA: when does the frost end?
Typically, the last spring freeze lands around 06/06, roughly 282 days out. Fall's first freeze usually shows up around 09/11, roughly 94 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Reardan in Zone 7a (0 to 5°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
With roughly 2 weeks until Reardan's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 06/06 isn't a guarantee
06/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/05 and only about 1 year in 10 sees frost after that.
Reardan against the rest of the dataset
Reardan's growing season runs about 94 days, ranking 39,844 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 687 of 700.
Learn more
Before leaning on 99040's figures: local microclimates explains what one yard in Reardan can differ from the 99040 normal, while zone vs. frost date explains why Zone 7a and Reardan's frost date answer different questions.