Reardan, WA 99029 Frost Dates
When can you plant in Reardan, WA?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. The first fall frost typically arrives around 09/26, about 137 frost-free days later.
Reardan sits in USDA Zone 6b (-5 to 0°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.
What to do before the first frost
About 4 weeks of growing season left in Reardan before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Reardan compares
Reardan's growing season runs about 137 days, ranking 37,555 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 622 of 700.
Learn more
zone vs. frost date covers why Zone 6b and Reardan's frost date answer different questions. the frost range covers how to read the range around Reardan's dates instead of trusting one.