Glyndon, MN 56561 Frost Dates
Glyndon, MN: when does the frost end?
Around 05/05 is the usual last spring frost, about 250 days away. Fall's first freeze usually shows up around 10/03, roughly 150 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Glyndon in Zone 4a (-30 to -25°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
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.
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
Glyndon's growing season runs about 150 days, ranking 35,329 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 522 of 943.
Learn more
Before leaning on 56561's figures: local microclimates explains what one yard in Glyndon can differ from the 56561 normal, while zone vs. frost date explains why Zone 4a and Glyndon's frost date answer different questions.