What to plant this week in Duluth, MN
With the ground still frozen and no plants ready to move or harvest in Duluth, this week is strictly for hardening off your seedlings indoors and planning your spring calendar ahead of the May 12 frost. Gardeners should focus on protecting winter gardens from heavy snow loads while keeping outdoor beds clear of debris.
The next 7 days
Duluth, MNGrowing in Duluth right now
- Duluth's clay-heavy soil freezes deep; wait until mid-May after the last frost date to turn over garden beds or lay down fresh mulch.
- Take advantage of the calm, sheltered bayside microclimate by starting cold-sensitive transplants like tomatoes and peppers indoors now for a May 10+ start.
- Monitor your winter vegetable patches (like kale or spinach) but do not add compost yet as it can burn dormant roots before spring warming begins.
- Check drainage around raised beds to prevent ice dams, which are common in our flat terrain during extended freeze-thaw cycles.
Sow this week
No direct sowing windows open this week.
Transplant this week
Nothing is due to go out this week.
Harvest soon
No harvest windows opening just yet.
Seasonal tips
- Finish all spring soil preparation now so you can move quickly to sowing once temperatures rise above 40°F.
- Apply a layer of mulch over winter-weeded areas to suppress weeds as they begin to push through.
- Review your crop calendar and order seeds or start indoor seedlings for late May planting dates.
Pest & disease watch
- Watch for late-winter voles nibbling on the crowns of overwintered perennials and carrots near water sources.
- Keep an eye out for dormant aphid colonies forming under early leaf buds as temperatures fluctuate between freezing and above zero.
- Prevent snow mold on winter wheatgrass or ornamental grasses by ensuring good air circulation if you have recently added heavy mulch.
Watering this week
Hold off on regular watering until the ground thaws and daytime highs consistently reach 50°F to avoid waterlogging frozen roots.
Clean up any remaining debris from last winter's garden now to reduce habitats for overwintering pests before spring planting begins.
Duluth gardening questions
3Can I plant anything in my Duluth garden right now?
No, with the average last frost date set for May 12, the ground is too cold and risk of freeze damage is high. The only exception is starting seeds indoors under lights or hardening off seedlings that are already started inside.
How long should I wait to turn over my garden soil in Duluth?
You must wait until after May 12 when the soil has thawed and warmed enough, typically by late May. Turning frozen clay can damage your tools and compact the soil further as it thaws unevenly.
What pests should I prepare for this coming spring in Minnesota?
As we approach frost-free dates, watch for aphids on new growth and cutworms attacking low-growing transplants like cabbage and carrots. Setting up row covers or insect netting early next week will give you a head start before the season fully begins.
Other cities in zone 4b
3See the full zone 4b guide → · Plan your Duluth garden in SproutGuide →