LaCrosse, WA 99143 Frost Dates
Frost dates for LaCrosse, WA, ZIP 99143
Typically, the last spring freeze lands around 05/13, roughly 258 days out. The first fall frost typically arrives around 09/26, about 133 frost-free days later.
LaCrosse sits in USDA Zone 7a (0 to 5°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
Zone 7a around LaCrosse has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How LaCrosse compares
LaCrosse's growing season runs about 133 days, ranking 38,135 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 635 of 700.
Learn more
zone vs. frost date explains why Zone 7a and LaCrosse's frost date answer different questions, and the frost range explains how to read the range around LaCrosse's dates instead of trusting one.