Avon, MN 56321 Frost Dates
Frost dates for Avon, MN, ZIP 56321
Around 05/03 is the usual last spring frost, about 248 days away. The first fall frost typically arrives around 10/07, about 155 frost-free days later.
Avon 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 Avon has about 6 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 Avon's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Avon compares
Avon's growing season runs about 155 days, ranking 34,001 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 356 of 943.
Learn more
local microclimates explains what one yard in Avon can differ from the 56321 normal, and zone vs. frost date explains why Zone 4b and Avon's frost date answer different questions.