Spring Grove, MN 55974 Frost Dates
Frost dates for Spring Grove, MN, ZIP 55974
Typically, the last spring freeze lands around 05/10, roughly 255 days out. The first fall frost typically arrives around 09/28, about 140 frost-free days later.
Spring Grove sits in USDA Zone 5a (-20 to -15°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.
What to do before the first frost
Zone 5a around Spring Grove has about 4 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.
How much risk comes with planting early here
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. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Spring Grove compares
Spring Grove's growing season runs about 140 days, ranking 37,073 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 740 of 943.
Learn more
local microclimates explains what one yard in Spring Grove can differ from the 55974 normal, and zone vs. frost date explains why Zone 5a and Spring Grove's frost date answer different questions.