Andover, MN 55304 Frost Dates
55304, near Andover, MN: the frost window
The last spring frost here typically falls around 05/05, about 250 days from today. Fall's first freeze usually shows up around 10/02, roughly 148 days after the last spring frost.
Zone 4b (-25 to -20°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 Andover, not a forecast for this year.
Stretching the season past the first frost
Andover's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Andover's last frost
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Andover against the rest of the dataset
Andover's growing season runs about 148 days, ranking 35,628 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 578 of 943.
Learn more
Two guides worth reading on 55304: the frost range, on how to read the range around Andover's dates instead of trusting one, and local microclimates, on what one yard in Andover can differ from the 55304 normal.