Latah, WA 99018 Frost Dates
Latah, WA: when does the frost end?
Around 05/30 is the usual last spring frost, about 275 days away. Fall's first freeze usually shows up around 09/04, roughly 94 days after the last spring frost.
Latah 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 1 week until Latah'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
05/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/13 and only about 1 year in 10 sees frost after that.
Latah against the rest of the dataset
Latah's growing season runs about 94 days, ranking 39,855 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 695 of 700.
Learn more
Before leaning on 99018's figures: zone vs. frost date explains why Zone 6b and Latah's frost date answer different questions, while the frost range explains how to read the range around Latah's dates instead of trusting one.