What Grows in Duluth, MN?
Duluth on Lake Superior has one of the coldest climates in the lower 48 — but summer lake effect moderates heat.
Zone
Last frost
First frost
Frost-free days
Duluth is in USDA Zone 3b with about 100 frost-free days, and you can grow kale, potatoes, root vegetables, brassicas, and more here.
Planting tips for Duluth
Very short season. Cold-hardy only. Use cold frames. Lake Superior moderates some temperatures.
What to plant, and when
Timing by your frost dates — last frost May 25, first frost August 30.
Cucumber, Pumpkin, Chives
Lettuce, Spinach, Kale, Broccoli, Carrot, Radish, Beets, Onion
Potato, Corn, Microgreens, Rhubarb, Mint, Strawberry, Blueberry, Raspberry
Garlic
What grows well in Duluth
Cucumber
Grows well
Lettuce
Grows well
Spinach
Grows well
Kale
Grows well
Broccoli
Grows well
Carrot
Grows well
Radish
Grows well
Beets
Grows well
Onion
Grows well
Garlic
Grows well
Potato
Grows well
Corn
Grows well
Peas
Grows well
Cabbage
Grows well
Brussels Sprouts
Grows well
Swiss Chard
Grows well
Arugula
Grows well
Microgreens
Grows well
Pumpkin
Grows well
Leek
Grows well
Asparagus
Grows well
Rhubarb
Grows well
Mint
Grows well
Parsley
Grows well
Cilantro
Grows well
Chives
Grows well
Dill
Grows well
Strawberry
Grows well
Blueberry
Grows well
Raspberry
Grows wellBorderline — needs extra care
Frequently asked questions
What hardiness zone is Duluth, MN in?
Duluth, MN is in USDA Hardiness Zone 3b. This drives everything about what you can reliably grow — it maps directly to how cold your winters get.
When is the last frost in Duluth?
The average last spring frost in Duluth is around May 25, and the first fall frost is typically August 30. Plan to move tender plants outside after May 25 and have them harvested (or protected) before August 30.
What grows well in Duluth?
Plenty — Duluth's USDA Zone 3b climate supports 30+ crops. Some of the easiest and most reliable here are Cucumber, Lettuce, Spinach.
How long is Duluth's growing season?
Duluth typically has around 100 frost-free days per year (roughly May 25 to August 30). That's enough for most annual vegetables if you start warm-season crops indoors and stick to faster-maturing varieties for anything tender.
What should I plant first in Duluth?
Go with fast-maturing crops to get a quick win while the season is short: Microgreens, Arugula, Cilantro are among the quickest from seed to harvest in Duluth.
Can I grow vegetables in containers in Duluth?
Yes — Duluth's climate is container-friendly for the right crops. Cucumber, Lettuce, Spinach all do well in pots, which also lets you start them a little earlier and move them in on cold nights.
When should I start seeds indoors in Duluth?
For warm-season crops like Cucumber, Kale, Broccoli, start seeds indoors 6–8 weeks before your last frost (around May 25), then transplant after the danger of frost has passed.
What's tricky to grow in Duluth?
A few crops need extra care in Duluth's climate — Thyme, Sage, Bok Choy are borderline here and may need season extension (row covers, cold frames, or a head start indoors).