Eagan, MN 55121 Frost Dates
55121, near Eagan, MN: the frost window
Around 04/23 is the usual last spring frost, about 238 days away. Fall's first freeze usually shows up around 10/18, roughly 176 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Eagan in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Eagan's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Eagan against the rest of the dataset
At roughly 176 frost-free days, Eagan places 26,345 of 40,283 ZIP codes in this dataset. Within MN, it ranks 29 of 943.
Learn more
Two guides worth reading on 55121: local microclimates, on what one yard in Eagan can differ from the 55121 normal, and zone vs. frost date, on why Zone 5a and Eagan's frost date answer different questions.