Mesa, WA 99330 Frost Dates
When can you plant in Mesa, WA?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/13, about 166 frost-free days later.
Mesa sits in USDA Zone 7a (0 to 5°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 7 weeks of growing season left in Mesa before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mesa compares
About 166 days separate Mesa's last and first frost, putting it 30,438 of 40,283 ZIP codes nationally. Within WA, it ranks 552 of 700.
Learn more
local microclimates covers what one yard in Mesa can differ from the 99330 normal. zone vs. frost date covers why Zone 7a and Mesa's frost date answer different questions.