Garrison, MN 56450 Frost Dates
Frost dates for Garrison, MN, ZIP 56450
Typically, the last spring freeze lands around 05/10, roughly 255 days out. The first fall frost typically arrives around 10/03, about 144 frost-free days later.
The USDA Plant Hardiness Zone Map puts Garrison in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 4a around Garrison has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Garrison's last frost
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Garrison compares
Garrison's growing season runs about 144 days, ranking 36,464 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 671 of 943.
Learn more
the frost range explains how to read the range around Garrison's dates instead of trusting one, and local microclimates explains what one yard in Garrison can differ from the 56450 normal.