Glyndon, MN 56547 Frost Dates
Glyndon, MN: when does the frost end?
Typically, the last spring freeze lands around 05/05, roughly 250 days out. Fall's first freeze usually shows up around 10/03, roughly 150 days after the last spring frost.
Glyndon sits in USDA Zone 4a (-30 to -25°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 5 weeks until Glyndon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/05 isn't a guarantee
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 35,328 of 40,283 ZIP codes in this dataset. Within MN, it ranks 521 of 943.
Learn more
Before leaning on 56547's figures: local microclimates explains what one yard in Glyndon can differ from the 56547 normal, while zone vs. frost date explains why Zone 4a and Glyndon's frost date answer different questions.