Medical Lake, WA 99022 Frost Dates
Medical Lake, WA: when does the frost end?
Around 05/10 is the usual last spring frost, about 255 days away. Fall's first freeze usually shows up around 09/26, roughly 137 days after the last spring frost.
Medical Lake sits in USDA Zone 6b (-5 to 0°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 4 weeks until Medical Lake's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Medical Lake against the rest of the dataset
Medical Lake's growing season runs about 137 days, ranking 37,513 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 621 of 700.
Learn more
Before leaning on 99022's figures: zone vs. frost date explains why Zone 6b and Medical Lake's frost date answer different questions, while the frost range explains how to read the range around Medical Lake's dates instead of trusting one.