Callaway, MN 56521 Frost Dates
When can you plant in Callaway, MN?
Around 05/05 is the usual last spring frost, about 250 days away. The first fall frost typically arrives around 10/03, about 150 frost-free days later.
The USDA Plant Hardiness Zone Map puts Callaway in Zone 4a (-30 to -25°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 5 weeks of growing season left in Callaway before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 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 Callaway compares
About 150 days separate Callaway's last and first frost, putting it 35,434 of 40,283 ZIP codes nationally. Within MN, it ranks 549 of 943.
Learn more
zone vs. frost date covers why Zone 4a and Callaway's frost date answer different questions. the frost range covers how to read the range around Callaway's dates instead of trusting one.