When to Plant Pumpkins in Minnesota

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when to plant pumpkins

Cultivating Mini and Pie Pumpkins in the North Star State

Pumpkins are a favorite among gardeners and consumers alike, especially during the fall season in Minnesota. Whether you’re growing mini pumpkins for decorative purposes or pie pumpkins for cooking, knowing when to plant and how to manage common pests and diseases is crucial for a successful harvest. This guide provides detailed information on the optimal planting times for pumpkins in Minnesota, the benefits of using 10-gallon grow bags, and managing the common diseases and pests that affect pumpkins in the region.

1. Understanding Minnesota’s Growing Season

Minnesota’s climate, with cold winters and a short growing season, poses unique challenges for pumpkin cultivation. Most pumpkin varieties require a long growing period free from frost, typically 90 to 120 days, depending on the variety.

2. The Best Time to Plant Pumpkins

In Minnesota, the ideal time to plant pumpkins is after the last spring frost to ensure they have enough time to mature before the first fall frost. Typically, this means sowing seeds directly in grow bags from late May to early June. This timing helps ensure that the pumpkins will be ready for harvest around September, perfect for fall festivities.

3. Choosing the Right Grow Bags

For mini and pie pumpkins, using 10-gallon grow bags is ideal. These bags offer ample space for the roots to spread and help maintain adequate soil moisture and temperature. The portability of grow bags also allows for easy movement to optimize sun exposure or protect the plants from harsh weather.

4. Preparing the Grow Bags

Fill your grow bags with a high-quality potting mix that includes plenty of organic matter. Pumpkins thrive in well-drained, nutrient-rich soil. Consider mixing in a balanced, slow-release fertilizer at the time of planting to support their growth needs throughout the season.

5. Starting Pumpkin Seeds

It’s best to start pumpkin seeds indoors in mid-April. Once the seedlings emerge and develop a set of true leaves, it’s ok to transplant to their new grow bag home outside. Make sure overnight temps are above 50F. This will probably be early June.

6. Common Diseases in Minnesota

Pumpkins in Minnesota are susceptible to several diseases, with powdery mildew being one of the most common. Powdery mildew presents as white, powdery spots on the leaves and can severely weaken the plant if left untreated. Regularly inspect your plants and consider using fungicides or organic methods like neem oil to manage outbreaks.

7. Insect Pests to Watch For

Pumpkins also face threats from various insect pests. In Minnesota, common pests include squash bugs, cucumber beetles, and vine borers. These pests can damage the leaves, stems, and fruit of the pumpkins, significantly affecting yield. Integrated pest management strategies, such as using floating row covers, applying appropriate insecticides, and practicing crop rotation, can help minimize these threats.

8. Watering and Maintenance

Pumpkins require consistent moisture, especially during the fruiting stage. Water your grow bags deeply and regularly, while making sure not to waterlog the soil. Mulching around the base of the plants can help retain soil moisture and suppress weeds.

9. Harvesting Your Pumpkins

Harvest your pumpkins once they have reached their desired size and the rinds have hardened. Cut the fruit from the vine with a few inches of stem attached, which helps extend their shelf life. Avoid carrying pumpkins by their stems, as they can break easily.


Growing pumpkins in Minnesota, especially in grow bags, requires careful planning and attention to timing, soil preparation, and pest management. By following these guidelines, you can enjoy a plentiful harvest of mini or pie pumpkins, perfect for seasonal decorations or delicious homemade pies!