Roy, WA 98580 Frost Dates
When can you plant in Roy, WA?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. The first fall frost typically arrives around 10/30, about 202 frost-free days later.
Zone 8b (15 to 20°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 Roy, not a forecast for this year.
What to do before the first frost
About 9 weeks of growing season left in Roy before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/11 isn't a guarantee
04/11 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. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Roy compares
At roughly 202 frost-free days, Roy places 17,294 of 40,283 ZIP codes in this dataset. Within WA, it ranks 298 of 700.
Learn more
the frost range covers how to read the range around Roy's dates instead of trusting one. local microclimates covers what one yard in Roy can differ from the 98580 normal.