Tieton, WA 98909 Frost Dates
When can you plant in Tieton, WA?
Typically, the last spring freeze lands around 04/08, roughly 223 days out. The first fall frost typically arrives around 10/23, about 196 frost-free days later.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Tieton, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Tieton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Tieton's last frost
04/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tieton compares
Tieton's growing season runs about 196 days, ranking 19,010 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 352 of 700.
Learn more
zone vs. frost date covers why Zone 7a and Tieton's frost date answer different questions. the frost range covers how to read the range around Tieton's dates instead of trusting one.