North Branch, MN 55078 Frost Dates
Frost dates for North Branch, MN, ZIP 55078
The last spring frost here typically falls around 05/19, about 264 days from today. The first fall frost typically arrives around 09/25, about 128 frost-free days later.
The USDA Plant Hardiness Zone Map puts North Branch 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 North Branch 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.
The actual range around North Branch's last frost
05/19 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. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How North Branch compares
North Branch's growing season runs about 128 days, ranking 38,531 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 874 of 943.
Learn more
zone vs. frost date explains why Zone 4b and North Branch's frost date answer different questions, and the frost range explains how to read the range around North Branch's dates instead of trusting one.