Granton, WI 54420 Frost Dates
When can you plant in Granton, WI?
Around 05/05 is the usual last spring frost, about 250 days away. The first fall frost typically arrives around 10/05, about 152 frost-free days later.
The USDA Plant Hardiness Zone Map puts Granton 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 Granton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Granton's last frost
05/05 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 Granton compares
About 152 days separate Granton's last and first frost, putting it 34,878 of 40,283 ZIP codes nationally. Within WI, it ranks 528 of 860.
Learn more
the frost range covers how to read the range around Granton's dates instead of trusting one. local microclimates covers what one yard in Granton can differ from the 54420 normal.