Humboldt, MN 56755 Frost Dates
Frost dates for Humboldt, MN, ZIP 56755
Around 05/16 is the usual last spring frost, about 261 days away. The first fall frost typically arrives around 09/29, about 137 frost-free days later.
Humboldt sits in USDA Zone 3b (-35 to -30°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 3b around Humboldt 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 Humboldt's last frost
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Humboldt compares
At roughly 137 frost-free days, Humboldt places 37,607 of 40,283 ZIP codes in this dataset. Within MN, it ranks 793 of 943.
Learn more
the frost range explains how to read the range around Humboldt's dates instead of trusting one, and local microclimates explains what one yard in Humboldt can differ from the 56755 normal.