Ranier, MN 56669 Frost Dates
Frost dates for Ranier, MN, ZIP 56669
Typically, the last spring freeze lands around 05/28, roughly 273 days out. The first fall frost typically arrives around 09/16, about 111 frost-free days later.
Zone 3b (-35 to -30°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 Ranier, not a forecast for this year.
What to do before the first frost
Zone 3b around Ranier has about 3 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
05/28 is the middle of 30 years of NOAA records, not a promise. Plant by 05/13 and you're betting against frost in roughly 9 years out of 10. 06/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ranier compares
Ranier's growing season runs about 111 days, ranking 39,471 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 907 of 943.
Learn more
local microclimates explains what one yard in Ranier can differ from the 56669 normal, and zone vs. frost date explains why Zone 3b and Ranier's frost date answer different questions.