Mesa, WA 99343 Frost Dates
Frost dates for Mesa, WA, ZIP 99343
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/12, about 165 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
Zone 7a around Mesa has about 6 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mesa compares
About 165 days separate Mesa's last and first frost, putting it 30,721 of 40,283 ZIP codes nationally. Within WA, it ranks 557 of 700.
Learn more
zone vs. frost date explains why Zone 7a and Mesa's frost date answer different questions, and the frost range explains how to read the range around Mesa's dates instead of trusting one.