Pasco, WA 99302 Frost Dates
Pasco, WA: when does the frost end?
Around 03/28 is the usual last spring frost, about 212 days away. Fall's first freeze usually shows up around 10/30, roughly 216 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Pasco in Zone 7b (5 to 10°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 9 weeks until Pasco'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
03/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/10 and only about 1 year in 10 sees frost after that.
Pasco against the rest of the dataset
About 216 days separate Pasco's last and first frost, putting it 13,705 of 40,283 ZIP codes nationally. Within WA, it ranks 254 of 700.
Learn more
Before leaning on 99302's figures: local microclimates explains what one yard in Pasco can differ from the 99302 normal, while zone vs. frost date explains why Zone 7b and Pasco's frost date answer different questions.