Lanesboro, MN 55949 Frost Dates
Frost dates for Lanesboro, MN, ZIP 55949
The last spring frost here typically falls around 05/14, about 259 days from today. The first fall frost typically arrives around 09/28, about 136 frost-free days later.
Zone 4b (-25 to -20°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 Lanesboro, not a forecast for this year.
What to do before the first frost
Zone 4b around Lanesboro 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.
How much risk comes with planting early here
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lanesboro compares
At roughly 136 frost-free days, Lanesboro places 37,742 of 40,283 ZIP codes in this dataset. Within MN, it ranks 798 of 943.
Learn more
zone vs. frost date explains why Zone 4b and Lanesboro's frost date answer different questions, and the frost range explains how to read the range around Lanesboro's dates instead of trusting one.