Delavan, WI 53115 Frost Dates
Frost dates for Delavan, WI, ZIP 53115
The last spring frost here typically falls around 04/28, about 243 days from today. The first fall frost typically arrives around 10/14, about 168 frost-free days later.
Zone 5b (-15 to -10°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 Delavan, not a forecast for this year.
What to do before the first frost
Zone 5b around Delavan has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Delavan compares
About 168 days separate Delavan's last and first frost, putting it 29,695 of 40,283 ZIP codes nationally. Within WI, it ranks 141 of 860.
Learn more
zone vs. frost date explains why Zone 5b and Delavan's frost date answer different questions, and the frost range explains how to read the range around Delavan's dates instead of trusting one.