University Place, WA 98333 Frost Dates
When can you plant in University Place, WA?
Typically, the last spring freeze lands around 03/11, roughly 195 days out. The first fall frost typically arrives around 11/21, about 254 frost-free days later.
University Place sits in USDA Zone 9a (20 to 25°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 12 weeks of growing season left in University Place before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around University Place's last frost
03/11 is the middle of 30 years of NOAA records, not a promise. Plant by 02/15 and you're betting against frost in roughly 9 years out of 10. 04/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How University Place compares
University Place's growing season runs about 254 days, ranking 6,999 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 56 of 700.
Learn more
the frost range covers how to read the range around University Place's dates instead of trusting one. local microclimates covers what one yard in University Place can differ from the 98333 normal.