Mossyrock, WA 98564 Frost Dates
When can you plant in Mossyrock, WA?
Typically, the last spring freeze lands around 04/07, roughly 222 days out. The first fall frost typically arrives around 11/13, about 215 frost-free days later.
Mossyrock sits in USDA Zone 8a (10 to 15°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 11 weeks of growing season left in Mossyrock before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/16 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mossyrock compares
Mossyrock's growing season runs about 215 days, ranking 14,149 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 257 of 700.
Learn more
local microclimates covers what one yard in Mossyrock can differ from the 98564 normal. zone vs. frost date covers why Zone 8a and Mossyrock's frost date answer different questions.