Colfax, WI 54730 Frost Dates
When can you plant in Colfax, WI?
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 10/03, about 151 frost-free days later.
The USDA Plant Hardiness Zone Map puts Colfax 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 5 weeks of growing season left in Colfax before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Colfax compares
Colfax's growing season runs about 151 days, ranking 35,079 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 543 of 860.
Learn more
zone vs. frost date covers why Zone 4b and Colfax's frost date answer different questions. the frost range covers how to read the range around Colfax's dates instead of trusting one.