Burlington, WA 98233 Frost Dates
Burlington, WA: when does the frost end?
Typically, the last spring freeze lands around 03/27, roughly 211 days out. Fall's first freeze usually shows up around 11/06, roughly 224 days after the last spring frost.
Burlington sits in USDA Zone 8b (15 to 20°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.
Stretching the season past the first frost
With roughly 10 weeks until Burlington's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/27 isn't a guarantee
03/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/17 and only about 1 year in 10 sees frost after that.
Burlington against the rest of the dataset
At roughly 224 frost-free days, Burlington places 11,794 of 40,283 ZIP codes in this dataset. Within WA, it ranks 216 of 700.
Learn more
Before leaning on 98233's figures: zone vs. frost date explains why Zone 8b and Burlington's frost date answer different questions, while the frost range explains how to read the range around Burlington's dates instead of trusting one.