Eagle River, WI 54558 Frost Dates
When can you plant in Eagle River, WI?
Typically, the last spring freeze lands around 05/19, roughly 264 days out. The first fall frost typically arrives around 10/03, about 136 frost-free days later.
Eagle River sits in USDA Zone 4a (-30 to -25°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 5 weeks of growing season left in Eagle River before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/19 isn't a guarantee
05/19 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Eagle River compares
Eagle River's growing season runs about 136 days, ranking 37,706 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 756 of 860.
Learn more
zone vs. frost date covers why Zone 4a and Eagle River's frost date answer different questions. the frost range covers how to read the range around Eagle River's dates instead of trusting one.