Oostburg, WI 53070 Frost Dates
When can you plant in Oostburg, WI?
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/16, about 165 frost-free days later.
Oostburg sits in USDA Zone 5b (-15 to -10°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
About 7 weeks of growing season left in Oostburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 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 Oostburg compares
About 165 days separate Oostburg's last and first frost, putting it 30,580 of 40,283 ZIP codes nationally. Within WI, it ranks 194 of 860.
Learn more
zone vs. frost date covers why Zone 5b and Oostburg's frost date answer different questions. the frost range covers how to read the range around Oostburg's dates instead of trusting one.