Glyndon, MN 56563 Frost Dates
56563, near Glyndon, 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 10/03, 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 Glyndon, not a forecast for this year.
Stretching the season past the first frost
Glyndon'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 Glyndon'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 05/20 and only about 1 year in 10 sees frost after that.
Glyndon against the rest of the dataset
At roughly 150 frost-free days, Glyndon places 35,330 of 40,283 ZIP codes in this dataset. Within MN, it ranks 523 of 943.
Learn more
Two guides worth reading on 56563: the frost range, on how to read the range around Glyndon's dates instead of trusting one, and local microclimates, on what one yard in Glyndon can differ from the 56563 normal.