Fennimore, WI 53809 Frost Dates
When can you plant in Fennimore, WI?
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/07, about 155 frost-free days later.
The USDA Plant Hardiness Zone Map puts Fennimore in Zone 5a (-20 to -15°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 Fennimore before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Fennimore's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fennimore compares
About 155 days separate Fennimore's last and first frost, putting it 33,985 of 40,283 ZIP codes nationally. Within WI, it ranks 440 of 860.
Learn more
zone vs. frost date covers why Zone 5a and Fennimore's frost date answer different questions. the frost range covers how to read the range around Fennimore's dates instead of trusting one.