Boscobel, WI 53805 Frost Dates
Frost dates for Boscobel, WI, ZIP 53805
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/07, about 155 frost-free days later.
Boscobel sits in USDA Zone 5a (-20 to -15°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
Zone 5a around Boscobel has about 6 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.
The actual range around Boscobel's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Boscobel compares
About 155 days separate Boscobel's last and first frost, putting it 33,977 of 40,283 ZIP codes nationally. Within WI, it ranks 439 of 860.
Learn more
local microclimates explains what one yard in Boscobel can differ from the 53805 normal, and zone vs. frost date explains why Zone 5a and Boscobel's frost date answer different questions.