Mountlake Terrace, WA 98043 Frost Dates
Mountlake Terrace, WA: when does the frost end?
The last spring frost here typically falls around 03/08, about 192 days from today. Fall's first freeze usually shows up around 11/23, roughly 259 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mountlake Terrace in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 12 weeks until Mountlake Terrace's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Mountlake Terrace's last frost
03/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/29 and only about 1 year in 10 sees frost after that.
Mountlake Terrace against the rest of the dataset
About 259 days separate Mountlake Terrace's last and first frost, putting it 6,556 of 40,283 ZIP codes nationally. Within WA, it ranks 42 of 700.
Learn more
Before leaning on 98043's figures: local microclimates explains what one yard in Mountlake Terrace can differ from the 98043 normal, while zone vs. frost date explains why Zone 9a and Mountlake Terrace's frost date answer different questions.