Moses Lake, WA 98837 Frost Dates
Frost dates for Moses Lake, WA, ZIP 98837
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/08, about 165 frost-free days later.
The USDA Plant Hardiness Zone Map puts Moses Lake in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7a around Moses Lake 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.
The actual range around Moses Lake's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Moses Lake compares
About 165 days separate Moses Lake's last and first frost, putting it 30,510 of 40,283 ZIP codes nationally. Within WA, it ranks 553 of 700.
Learn more
zone vs. frost date explains why Zone 7a and Moses Lake's frost date answer different questions, and the frost range explains how to read the range around Moses Lake's dates instead of trusting one.