When to Plant Seeds in Minnesota

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When to plant seeds in minnesota

Maximizing Your Garden with Grow Bags

When to plant seeds in Minnesota? Minnesota’s diverse climate, marked by cold winters and warm, short growing seasons, can present unique challenges for gardeners. However, with the versatility of grow bags, you can extend your gardening season and grow a variety of plants from seeds. In this article, we’ll explore when to plant seeds in Minnesota using grow bags, allowing you to make the most of your garden, regardless of the state’s sometimes unpredictable weather.

Understanding Minnesota’s Growing Seasons and when to plant seeds

Minnesota’s climate is classified as a northern continental climate, with cold winters and relatively short summers. To successfully grow plants from seeds, it’s essential to understand the growing seasons in the state:

– Last Frost Date: Minnesota typically experiences the last spring frost around mid May. After this date, it’s generally safe to plant seeds and seedlings outdoors.

– First Frost Date: The first fall frost in Minnesota occurs in late September to early October. This marks the end of the growing season for many plants, especially those sensitive to cold.

– Warmest Months: The warmest months in Minnesota are June, July, and August. This is when the bulk of plant growth and fruiting occurs.

Using Grow Bags to Extend the Growing Season

When planting seeds in Minnesota, grow bags offer several advantages for gardeners in Minnesota:

1. Mobility: Grow bags are portable and can be moved to find the best sunlight, shelter from adverse weather conditions, or to maximize warmth during colder periods.

2. Temperature Control: Grow bags can be brought indoors when necessary to protect plants from late spring frosts or extended the growing season into early fall.

3. Better Soil Temperature: The soil in grow bags typically warms up faster in the spring, allowing for earlier planting.

4. Soil Quality: You have control over the quality of the soil in the grow bags, ensuring optimal conditions for seed germination and plant growth.

5. Space Efficiency: Grow bags are ideal for small spaces like balconies, patios, and small gardens, making them a suitable choice for urban gardeners.

When to Plant Seeds in Grow Bags

The ability to control soil conditions in grow bags means you can extend your growing season for a variety of plants. Here’s a month-by-month guide on when to plant seeds in Minnesota using grow bags:

1. April

  • Cold-Hardy Greens: Start sowing seeds of cold-hardy greens like lettuce, spinach, and arugula in early April in grow bags. These cool-season crops can withstand light frosts and are perfect for early spring planting.

2. May

  • Tomatoes and Peppers: Start tomato and pepper seeds indoors in early May. Once they have grown strong seedlings, transplant them into grow bags or outdoor containers after the last spring frost.
  • Herbs: Herbs like basil, cilantro, and chives can be sown in grow bags after the last spring frost for a fresh supply throughout the summer.

3. June

  • Warm-Season Vegetables: In early June, it’s time to plant warm-season vegetables like cucumbers, zucchini, and summer squash in grow bags. These heat-loving plants thrive during Minnesota’s short summer.
  • Flowers: Plant seeds of annual flowers like marigolds, petunias, and zinnias in early June. They’ll add color and beauty to your garden throughout the summer.

4. July

  • Fall Vegetables: In early July, start sowing seeds for fall vegetables like radishes, carrots, and beets in grow bags. These crops can tolerate cooler temperatures and are ideal for late-season planting.
  • Perennials: You can also plant perennial flowers and herbs in July. While they may not bloom in the first year, they’ll establish strong roots for future growth.

5. August

  • Winter Greens: August is the time to plant seeds for winter greens like kale, Swiss chard, and winter lettuce. These plants will continue to grow in the fall and can be harvested well into the winter.
  • Overwintering Plants: Some vegetables like garlic can be planted in August for overwintering. They will establish roots in the fall and be ready for a robust spring harvest.

6. September

  • Spring-Flowering Bulbs: While not grown from seeds, September is the time to plant spring-flowering bulbs like tulips, daffodils, and crocuses in grow bags. These bulbs need a period of winter cold to bloom in the spring.

7. October

  • Garlic: If you missed the August planting for overwintering garlic, early October is still a suitable time for planting.

8. November

  • Strawberries: Plant strawberry crowns in late November in grow bags. These can be overwintered outdoors with protection or moved indoors to extend the growing season.

9. December to March

  • Indoor Herbs: Throughout the winter, continue growing herbs like basil, chives, and parsley indoors in grow bags. Place them in a sunny windowsill or under grow lights for year-round harvest.

Tips for Successful Seed Planting in Grow Bags

To make the most of your seed planting in grow bags, consider the following tips:

  • Quality Potting Mix: Use a high-quality potting mix suitable for the type of plants you’re growing. Well-draining mixes work well for most plants.
  • Proper Watering: Keep the soil consistently moist, but avoid waterlogging. Grow bags may require more frequent watering than in-ground gardens, especially during hot summer months.
  • Fertilize Appropriately: Apply a balanced, slow-release fertilizer according to the needs of your specific plants. Follow the recommended application rates on the fertilizer packaging.
  • Mulching: Adding a layer of mulch to the top of the soil helps retain moisture, reduce weed growth, and moderate soil temperatures.
  • Protection: Use row covers or frost cloth to protect sensitive plants from late spring frosts or early fall chills.
  • Monitor Growth: Regularly inspect your plants for signs of pests, diseases, or nutrient deficiencies. Address any issues promptly to ensure a healthy garden.
  • Pruning and Thinning: As your plants grow, thin or prune as needed to promote air circulation and healthy growth. This is particularly important for vegetables and herbs.


With the use of grow bags, gardeners in Minnesota can extend their growing season and enjoy a diverse range of plants. By carefully timing your seed planting in Minnesota, you can make the most of your garden, from cool-season crops in early spring to overwintering plants in late fall. The versatility and mobility of grow bags allow for optimal growing conditions, making gardening a rewarding and enjoyable experience even in a challenging climate. So, whether you’re a seasoned gardener or a beginner, consider using grow bags to maximize your garden and savor the beauty and abundance of your homegrown plants.