St. Francis, WI 53237 Frost Dates
When can you plant in St. Francis, WI?
Typically, the last spring freeze lands around 04/22, roughly 237 days out. The first fall frost typically arrives around 10/26, about 184 frost-free days later.
St. Francis sits in USDA Zone 6a (-10 to -5°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 8 weeks of growing season left in St. Francis before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around St. Francis's last frost
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Francis compares
About 184 days separate St. Francis's last and first frost, putting it 23,479 of 40,283 ZIP codes nationally. Within WI, it ranks 17 of 860.
Learn more
zone vs. frost date covers why Zone 6a and St. Francis's frost date answer different questions. the frost range covers how to read the range around St. Francis's dates instead of trusting one.