Minnesota winter gardening requires selecting cold-hardy vegetables that can survive under row covers or in unheated hoophouses. Finding the best vegetables to grow in minnesota winter is about choosing crops that thrive in short days, low light, and freezing temperatures. You don’t need a heated greenhouse to enjoy fresh greens all season long.
Winter in Minnesota is harsh, but many vegetables actually taste sweeter after a frost. The key is to plant at the right time and use simple protection like cold frames or heavy mulch. Here is your complete guide to growing a productive winter garden in the North Star State.
Understanding Minnesota Winter Growing Conditions
Minnesota winters bring extreme cold, with temperatures often dropping below zero. Day length shrinks to just 8-9 hours by December. But with the right crops, you can still harvest from October through March.
Your main tools for winter growing are unheated hoophouses, low tunnels, row covers, and deep mulch. These structures trap heat from the ground and block harsh winds. They create a microclimate that is 10-15 degrees warmer than outside.
Key Factors For Winter Success
First, choose vegetables that are naturally frost-tolerant. Second, plant them early enough so they mature before the deep cold hits. Third, use season extension methods to keep the soil from freezing solid.
Many winter vegetables can be planted in late summer or early fall. They grow slowly as days shorten, then hold in the garden until you need them. This is called “overwintering” and it works great in Minnesota.
Best Vegetables To Grow In Minnesota Winter
Now lets get into the top choices. These vegetables have proven themselves in Minnesota’s tough winters. They require minimal protection and deliver fresh food when you need it most.
Kale
Kale is the king of winter greens. It can survive temperatures down to -10°F with just a row cover. The leaves get sweeter after a hard frost, turning starches into sugars.
- Varieties: ‘Winterbor’, ‘Red Russian’, ‘Siberian’
- Plant in late August for fall harvest, or September for winter harvest
- Harvest outer leaves regularly to keep plants producing
- Under a hoophouse, kale will produce all winter long
Spinach
Spinach is another cold-hardy superstar. It germinates in cool soil and grows well in low light. With protection, you can harvest spinach from November through March.
- Varieties: ‘Winter Bloomsdale’, ‘Giant Winter’, ‘Space’
- Plant in September for overwintering
- Use a low tunnel or cold frame for best results
- Spinach will stop growing in deep cold but resume in late winter
Carrots
Carrots store well in the ground all winter. They need a thick layer of mulch or straw to keep the soil from freezing. Dig them up as needed, even under snow.
- Varieties: ‘Napoli’, ‘Mokum’, ‘Bolero’
- Plant in July or August for fall maturity
- Cover with 12-18 inches of straw or leaves before ground freezes
- Carrots taste sweeter after a frost
Mache (Corn Salad)
Mache is a little-known winter green that thrives in cold. It grows in rosettes and has a mild, nutty flavor. It needs almost no protection, just a light row cover.
- Varieties: ‘Vit’, ‘Valley Green’
- Plant in September for winter harvest
- Survives down to -20°F without protection
- Harvest whole rosettes or individual leaves
Winter Lettuce
Not all lettuce can handle winter, but some varieties are bred for cold. They grow slowly in low light and hold well without bolting. Use a hoophouse or cold frame for best results.
- Varieties: ‘Winter Density’, ‘Arctic King’, ‘North Pole’
- Plant in September for November harvest
- Keep soil moist but not wet to prevent rot
- Harvest as full heads or cut-and-come-again
Turnips
Turnips are fast-growing and cold-tolerant. Both the roots and greens are edible. They store well in the ground under mulch or in a root cellar.
- Varieties: ‘Purple Top White Globe’, ‘Hakurei’
- Plant in August for fall harvest
- Cover with straw for winter storage in ground
- Greens can be harvested until hard freeze
Brussels Sprouts
Brussels sprouts actually improve with frost. They need a long growing season but can be harvested well into winter. The sprouts get sweeter after several freezes.
- Varieties: ‘Jade Cross’, ‘Long Island Improved’
- Plant in May for winter harvest
- Remove lower leaves to encourage sprout development
- Harvest from bottom up as sprouts mature
Parsnips
Parsnips are one of the most cold-hardy vegetables. They need a long season to develop sweetness. Leave them in the ground all winter and dig in early spring.
- Varieties: ‘Hollow Crown’, ‘Harris Model’
- Plant in May or June for winter storage
- Cover with mulch to ease digging
- Flavor improves dramatically after freezing
Setting Up Your Winter Garden
You don’t need expensive equipment to grow winter vegetables. Simple structures made from PVC pipes and plastic sheeting work great. Here is how to set up your winter garden step by step.
Choose Your Protection Method
- Low Tunnels: Bend PVC hoops over your beds and cover with greenhouse plastic. Secure the edges with soil or sandbags. This is the cheapest and most effective method.
- Cold Frames: Build a wooden box with a glass or plastic lid. Place it over your garden bed. Cold frames trap heat and block wind perfectly.
- Row Covers: Use floating row covers made from spun polyester. They let light and water through but provide 4-8 degrees of frost protection.
- Deep Mulch: Pile straw, leaves, or wood chips 12-18 inches deep over root crops. This insulates the soil and prevents freezing.
Timing Your Plantings
For winter harvest, you need to plant in late summer or early fall. Here is a general timeline for Minnesota:
- July: Plant carrots, parsnips, and Brussels sprouts
- August: Plant kale, turnips, and winter lettuce
- September: Plant spinach, mache, and overwintering onions
- October: Plant garlic for next summer harvest
Pay attention to your first frost date. In southern Minnesota, that is usually mid-October. In northern Minnesota, it can be late September. Adjust your planting schedule accordingly.
Soil Preparation
Winter vegetables need rich, well-draining soil. Add compost or aged manure before planting. A soil test is helpful to check pH and nutrient levels. Most winter crops prefer a pH between 6.0 and 7.0.
Mulch is critical for winter gardening. It keeps soil temperature stable and prevents heaving from freeze-thaw cycles. Apply a thick layer after the ground freezes in late fall.
Care Tips For Winter Vegetables
Winter gardening is lower maintenance than summer gardening. But there are a few key things to watch for. Here is how to keep your winter vegetables healthy.
Watering
Water less in winter. The soil stays moist longer because evaporation is slow. Overwatering can lead to root rot. Check soil moisture by feeling an inch below the surface.
On sunny winter days, the inside of a hoophouse can get warm. Open the ends slightly to vent excess heat and humidity. This prevents mold and mildew.
Pest And Disease Management
Most pests are dormant in winter. But aphids and slugs can still be a problem in hoophouses. Check under leaves regularly. Use insecticidal soap or diatomaceous earth if needed.
Fungal diseases like powdery mildew can occur in humid conditions. Improve air circulation by spacing plants properly. Remove any diseased leaves immediately.
Harvesting In Cold Weather
Harvest on milder days when temperatures are above freezing. Use a sharp knife or scissors to cut leaves and stems. For root crops, use a garden fork to loosen the soil before pulling.
In deep cold, plants may freeze solid. Don’t worry, they will thaw out and be fine. Just don’t handle frozen plants as they are brittle and can break.
Common Mistakes To Avoid
Even experienced gardeners make mistakes with winter vegetables. Here are the most common ones and how to avoid them.
- Planting too late: Winter vegetables need time to establish before the cold hits. Follow the planting dates above.
- Using wrong varieties: Not all kale or lettuce is winter-hardy. Stick to varieties bred for cold climates.
- Poor ventilation: Closed hoophouses can get too humid. Vent on sunny days to prevent disease.
- Neglecting mulch: Mulch is essential for root crops. Without it, the ground freezes solid and you can’t harvest.
- Overwatering: Plants need less water in winter. Let the soil dry out between waterings.
Frequently Asked Questions
What is the easiest winter vegetable to grow in Minnesota?
Kale is the easiest. It tolerates cold, grows in poor soil, and requires minimal protection. Just plant it in late summer and cover with a row cover when temperatures drop below 20°F.
Can I grow winter vegetables in a container?
Yes, but containers freeze faster than ground soil. Use large pots (at least 12 inches deep) and wrap them with bubble wrap or burlap. Move containers against a south-facing wall for extra warmth.
Do I need a heated greenhouse for winter vegetables?
No. Unheated hoophouses and cold frames work fine for cold-hardy vegetables. The key is choosing the right crops and planting at the right time. Heated greenhouses are only needed for warm-season crops like tomatoes.
How do I protect vegetables from extreme cold snaps?
Add extra layers of row covers or blankets when temperatures drop below -10°F. Use milk jugs filled with water inside the hoophouse to absorb heat during the day and release it at night. This can raise temperatures by 5-10 degrees.
When should I start planting for winter harvest?
Start in July for slow-growing crops like parsnips and Brussels sprouts. Plant faster-growing greens like spinach and mache in September. The exact timing depends on your location in Minnesota and your first frost date.
Final Thoughts On Winter Gardening In Minnesota
Winter gardening in Minnesota is not only possible, it is rewarding. You get fresh, homegrown vegetables when store prices are high and variety is low. The best vegetables to grow in minnesota winter are cold-hardy, low-maintenance, and delicious.
Start small with a few beds and simple row covers. As you gain experience, expand to hoophouses and cold frames. Your winter garden will become a source of pride and fresh food all season long.
Remember to choose the right varieties, plant on time, and protect your crops from extreme cold. With these tips, you can enjoy fresh kale, spinach, carrots, and more even in the depths of a Minnesota winter. Happy growing.