Rhinelander, WI 54548 Frost Dates
When can you plant in Rhinelander, WI?
Typically, the last spring freeze lands around 05/23, roughly 268 days out. The first fall frost typically arrives around 09/27, about 127 frost-free days later.
Rhinelander 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 4 weeks of growing season left in Rhinelander before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Rhinelander's last frost
05/23 is the middle of 30 years of NOAA records, not a promise. Plant by 05/07 and you're betting against frost in roughly 9 years out of 10. 06/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rhinelander compares
At roughly 127 frost-free days, Rhinelander places 38,618 of 40,283 ZIP codes in this dataset. Within WI, it ranks 806 of 860.
Learn more
local microclimates covers what one yard in Rhinelander can differ from the 54548 normal. zone vs. frost date covers why Zone 4a and Rhinelander's frost date answer different questions.