Elroy, WI 53929 Frost Dates
Elroy, WI: when does the frost end?
The last spring frost here typically falls around 05/12, about 257 days from today. Fall's first freeze usually shows up around 09/29, roughly 138 days after the last spring frost.
Zone 5a (-20 to -15°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 Elroy, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Elroy's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/12 isn't a guarantee
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Elroy against the rest of the dataset
About 138 days separate Elroy's last and first frost, putting it 37,417 of 40,283 ZIP codes nationally. Within WI, it ranks 745 of 860.
Learn more
Before leaning on 53929's figures: zone vs. frost date explains why Zone 5a and Elroy's frost date answer different questions, while the frost range explains how to read the range around Elroy's dates instead of trusting one.