McGrath, MN 56350 Frost Dates
Frost dates for McGrath, MN, ZIP 56350
Around 05/10 is the usual last spring frost, about 255 days away. The first fall frost typically arrives around 10/03, about 144 frost-free days later.
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 McGrath, not a forecast for this year.
What to do before the first frost
Zone 4a around McGrath 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 McGrath'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 McGrath compares
McGrath's growing season runs about 144 days, ranking 36,481 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 675 of 943.
Learn more
the frost range explains how to read the range around McGrath's dates instead of trusting one, and local microclimates explains what one yard in McGrath can differ from the 56350 normal.