Deer Park, WA 99003 Frost Dates
Frost dates for Deer Park, WA, ZIP 99003
Around 05/22 is the usual last spring frost, about 267 days away. The first fall frost typically arrives around 09/14, about 112 frost-free days later.
Zone 6b (-5 to 0°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 Deer Park, not a forecast for this year.
What to do before the first frost
Zone 6b around Deer Park has about 2 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.
How much risk comes with planting early here
05/22 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 06/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Deer Park compares
Deer Park's growing season runs about 112 days, ranking 39,417 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 665 of 700.
Learn more
local microclimates explains what one yard in Deer Park can differ from the 99003 normal, and zone vs. frost date explains why Zone 6b and Deer Park's frost date answer different questions.