Sedro-Woolley, WA 98284 Frost Dates
When can you plant in Sedro-Woolley, WA?
Around 03/27 is the usual last spring frost, about 211 days away. The first fall frost typically arrives around 11/06, about 224 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sedro-Woolley in Zone 8b (15 to 20°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 10 weeks of growing season left in Sedro-Woolley before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/27 isn't a guarantee
03/27 is the middle of 30 years of NOAA records, not a promise. Plant by 03/08 and you're betting against frost in roughly 9 years out of 10. 04/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sedro-Woolley compares
At roughly 224 frost-free days, Sedro-Woolley places 11,785 of 40,283 ZIP codes in this dataset. Within WA, it ranks 214 of 700.
Learn more
the frost range covers how to read the range around Sedro-Woolley's dates instead of trusting one. local microclimates covers what one yard in Sedro-Woolley can differ from the 98284 normal.