Lismore, MN 56155 Frost Dates
Frost dates for Lismore, MN, ZIP 56155
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 09/29, about 145 frost-free days later.
Lismore sits in USDA Zone 5a (-20 to -15°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 5a around Lismore 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.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lismore compares
About 145 days separate Lismore's last and first frost, putting it 36,295 of 40,283 ZIP codes nationally. Within MN, it ranks 638 of 943.
Learn more
the frost range explains how to read the range around Lismore's dates instead of trusting one, and local microclimates explains what one yard in Lismore can differ from the 56155 normal.