Junction City, WI 54443 Frost Dates
When can you plant in Junction City, WI?
Typically, the last spring freeze lands around 05/04, roughly 249 days out. The first fall frost typically arrives around 10/07, about 155 frost-free days later.
The USDA Plant Hardiness Zone Map puts Junction City in Zone 4b (-25 to -20°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 6 weeks of growing season left in Junction City before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Junction City compares
At roughly 155 frost-free days, Junction City places 34,102 of 40,283 ZIP codes in this dataset. Within WI, it ranks 447 of 860.
Learn more
zone vs. frost date covers why Zone 4b and Junction City's frost date answer different questions. the frost range covers how to read the range around Junction City's dates instead of trusting one.