Olympia, WA 98502 Frost Dates
Olympia, WA: when does the frost end?
Typically, the last spring freeze lands around 04/29, roughly 244 days out. Fall's first freeze usually shows up around 10/14, roughly 169 days after the last spring frost.
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 Olympia, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Olympia's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Olympia against the rest of the dataset
At roughly 169 frost-free days, Olympia places 29,315 of 40,283 ZIP codes in this dataset. Within WA, it ranks 511 of 700.
Learn more
Before leaning on 98502's figures: the frost range explains how to read the range around Olympia's dates instead of trusting one, while local microclimates explains what one yard in Olympia can differ from the 98502 normal.