Cannon Falls, MN 55009 Frost Dates
Frost dates for Cannon Falls, MN, ZIP 55009
Around 04/23 is the usual last spring frost, about 238 days away. The first fall frost typically arrives around 10/14, about 173 frost-free days later.
Cannon Falls sits in USDA Zone 4b (-25 to -20°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 4b around Cannon Falls has about 7 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 Cannon Falls's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/08 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cannon Falls compares
Cannon Falls's growing season runs about 173 days, ranking 27,883 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 75 of 943.
Learn more
zone vs. frost date explains why Zone 4b and Cannon Falls's frost date answer different questions, and the frost range explains how to read the range around Cannon Falls's dates instead of trusting one.