Union Center, WI 53962 Frost Dates
When can you plant in Union Center, WI?
The last spring frost here typically falls around 05/12, about 257 days from today. The first fall frost typically arrives around 09/29, about 138 frost-free days later.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Union Center, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Union Center before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Union Center's last frost
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Union Center compares
At roughly 138 frost-free days, Union Center places 37,458 of 40,283 ZIP codes in this dataset. Within WI, it ranks 750 of 860.
Learn more
local microclimates covers what one yard in Union Center can differ from the 53962 normal. zone vs. frost date covers why Zone 4b and Union Center's frost date answer different questions.