Henning, MN 56551 Frost Dates
Frost dates for Henning, MN, ZIP 56551
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 10/05, about 153 frost-free days later.
Henning sits in USDA Zone 4a (-30 to -25°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 4a around Henning 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 Henning's last frost
05/05 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. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Henning compares
At roughly 153 frost-free days, Henning places 34,572 of 40,283 ZIP codes in this dataset. Within MN, it ranks 419 of 943.
Learn more
local microclimates explains what one yard in Henning can differ from the 56551 normal, and zone vs. frost date explains why Zone 4a and Henning's frost date answer different questions.