Callaway, MN 56502 Frost Dates
Callaway, MN: when does the frost end?
Around 05/05 is the usual last spring frost, about 250 days away. Fall's first freeze usually shows up around 10/03, roughly 150 days after the last spring frost.
Zone 4a (-30 to -25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Callaway, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Callaway's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Callaway against the rest of the dataset
Callaway's growing season runs about 150 days, ranking 35,433 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 548 of 943.
Learn more
Before leaning on 56502's figures: zone vs. frost date explains why Zone 4a and Callaway's frost date answer different questions, while the frost range explains how to read the range around Callaway's dates instead of trusting one.