College Place, WA 99324 Frost Dates
When can you plant in College Place, WA?
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/01, about 151 frost-free days later.
The USDA Plant Hardiness Zone Map puts College Place 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
About 5 weeks of growing season left in College Place before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around College Place's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How College Place compares
At roughly 151 frost-free days, College Place places 34,969 of 40,283 ZIP codes in this dataset. Within WA, it ranks 595 of 700.
Learn more
local microclimates covers what one yard in College Place can differ from the 99324 normal. zone vs. frost date covers why Zone 7a and College Place's frost date answer different questions.