Nielsville, MN 56568 Frost Dates
When can you plant in Nielsville, MN?
Typically, the last spring freeze lands around 05/02, roughly 247 days out. The first fall frost typically arrives around 10/09, about 158 frost-free days later.
Nielsville sits in USDA Zone 4a (-30 to -25°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 6 weeks of growing season left in Nielsville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Nielsville compares
About 158 days separate Nielsville's last and first frost, putting it 33,174 of 40,283 ZIP codes nationally. Within MN, it ranks 302 of 943.
Learn more
zone vs. frost date covers why Zone 4a and Nielsville's frost date answer different questions. the frost range covers how to read the range around Nielsville's dates instead of trusting one.