Millville, MN 55968 Frost Dates
Frost dates for Millville, MN, ZIP 55968
Around 05/07 is the usual last spring frost, about 252 days away. The first fall frost typically arrives around 10/02, about 148 frost-free days later.
The USDA Plant Hardiness Zone Map puts Millville in Zone 4b (-25 to -20°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 4b around Millville 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.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Millville compares
Millville's growing season runs about 148 days, ranking 35,813 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 603 of 943.
Learn more
local microclimates explains what one yard in Millville can differ from the 55968 normal, and zone vs. frost date explains why Zone 4b and Millville's frost date answer different questions.