Duluth, MN 55812 Frost Dates
When can you plant in Duluth, MN?
The last spring frost here typically falls around 05/14, about 259 days from today. The first fall frost typically arrives around 10/12, about 149 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 Duluth, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Duluth before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Duluth's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Duluth compares
Duluth's growing season runs about 149 days, ranking 35,476 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 561 of 943.
Learn more
the frost range covers how to read the range around Duluth's dates instead of trusting one. local microclimates covers what one yard in Duluth can differ from the 55812 normal.