Winona, MN 55942 Frost Dates
When can you plant in Winona, MN?
Around 04/21 is the usual last spring frost, about 236 days away. The first fall frost typically arrives around 10/19, about 180 frost-free days later.
The USDA Plant Hardiness Zone Map puts Winona in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 7 weeks of growing season left in Winona before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Winona's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Winona compares
Winona's growing season runs about 180 days, ranking 24,794 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 4 of 943.
Learn more
zone vs. frost date covers why Zone 5a and Winona's frost date answer different questions. the frost range covers how to read the range around Winona's dates instead of trusting one.