Harrington, WA 99154 Frost Dates
When can you plant in Harrington, WA?
The last spring frost here typically falls around 05/31, about 276 days from today. The first fall frost typically arrives around 09/12, about 101 frost-free days later.
Harrington 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.
What to do before the first frost
About 2 weeks of growing season left in Harrington before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/10 and you're betting against frost in roughly 9 years out of 10. 06/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Harrington compares
About 101 days separate Harrington's last and first frost, putting it 39,688 of 40,283 ZIP codes nationally. Within WA, it ranks 684 of 700.
Learn more
zone vs. frost date covers why Zone 6b and Harrington's frost date answer different questions. the frost range covers how to read the range around Harrington's dates instead of trusting one.