LaCrosse, WA 99136 Frost Dates
Frost dates for LaCrosse, WA, ZIP 99136
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.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for LaCrosse, not a forecast for this year.
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.
Why 05/13 isn't a guarantee
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
About 133 days separate LaCrosse's last and first frost, putting it 38,134 of 40,283 ZIP codes nationally. Within WA, it ranks 634 of 700.
Learn more
local microclimates explains what one yard in LaCrosse can differ from the 99136 normal, and zone vs. frost date explains why Zone 7a and LaCrosse's frost date answer different questions.