LaCrosse, WA 99105 Frost Dates
When can you plant in LaCrosse, WA?
Around 05/13 is the usual last spring frost, about 258 days away. The first fall frost typically arrives around 09/26, about 133 frost-free days later.
The USDA Plant Hardiness Zone Map puts LaCrosse in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 4 weeks of growing season left in LaCrosse before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 38,133 of 40,283 ZIP codes nationally. Within WA, it ranks 633 of 700.
Learn more
local microclimates covers what one yard in LaCrosse can differ from the 99105 normal. zone vs. frost date covers why Zone 7a and LaCrosse's frost date answer different questions.