Caledonia, MN 55921 Frost Dates
Caledonia, MN: when does the frost end?
Typically, the last spring freeze lands around 04/29, roughly 244 days out. Fall's first freeze usually shows up around 10/10, roughly 165 days after the last spring frost.
Caledonia sits in USDA Zone 5a (-20 to -15°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.
Stretching the season past the first frost
With roughly 6 weeks until Caledonia's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Caledonia's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Caledonia against the rest of the dataset
Caledonia's growing season runs about 165 days, ranking 30,590 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 113 of 943.
Learn more
Before leaning on 55921's figures: the frost range explains how to read the range around Caledonia's dates instead of trusting one, while local microclimates explains what one yard in Caledonia can differ from the 55921 normal.