Sprague, WA 99032 Frost Dates
When can you plant in Sprague, 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.
Sprague 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 Sprague before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/31 isn't a guarantee
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 Sprague compares
At roughly 101 frost-free days, Sprague places 39,684 of 40,283 ZIP codes in this dataset. Within WA, it ranks 680 of 700.
Learn more
zone vs. frost date covers why Zone 6b and Sprague's frost date answer different questions. the frost range covers how to read the range around Sprague's dates instead of trusting one.