When to Plant Tomatoes in Missouri?

Tomatoes are a cherished addition to gardens across Missouri, providing gardeners with a bounty of flavorful, juicy fruits. However, to achieve a successful tomato harvest in the Show-Me State, it’s vital to understand the local climate and select the right tomato varieties. In this guide, we’ll explore the key considerations for planting tomatoes in Missouri, ensuring a thriving garden full of delicious homegrown tomatoes.

Missouri’s Climate

Missouri’s climate is characterized by its diversity, with regions experiencing varying temperature ranges and precipitation levels. Key climate features to consider include:

  • Temperature Variations: Missouri’s climate includes hot summers and cold winters. While the southern regions tend to have milder winters, the northern areas often experience more significant temperature fluctuations.
  • Frost Dates: Frost dates in Missouri play a crucial role in determining when to plant tomatoes. The last spring frost can vary from early April in the southern part of the state to early May in the north. The first fall frost typically occurs from mid-October to early November.
  • Regional Differences: The climate in Missouri varies by region due to its diverse topography. Western and southern regions benefit from the warming effects of the Ozark Plateau, while the northern areas experience cooler temperatures influenced by the Missouri River.

Selecting Tomato Varieties

Selecting the right tomato varieties is a vital first step in successful tomato gardening in Missouri. Consider the following factors:

  • Determinate vs. Indeterminate: Determine whether you want determinate varieties, which produce a concentrated harvest and are well-suited for canning, or indeterminate varieties, which provide a continuous supply of fruits throughout the season.
  • Early and Mid-Season Varieties: In Missouri’s variable climate, it’s a good idea to include early and mid-season varieties. These tomatoes tend to mature quicker, which can help you avoid late-season frost damage.
  • Disease Resistance: Choose tomato varieties with disease resistance, especially to common issues like Early Blight and Late Blight, which can affect plants in the state’s humid conditions.
  • Flavor and Use: Consider the culinary purpose of your tomatoes. Some varieties are best for slicing and enjoying fresh, while others are excellent for sauces, canning, or drying.
  • Space and Support: Keep in mind the space available in your garden and whether you’ll provide support for indeterminate varieties with trellises or cages.
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By carefully selecting the right tomato varieties that suit Missouri’s climate and your gardening goals, you’ll set the stage for a successful tomato garden that yields an abundance of delicious, homegrown tomatoes.

Spring Planting

When it comes to planting tomatoes in Missouri, spring offers an ideal window of opportunity. Here’s what you need to know about spring planting:

  • Optimal Timing: Spring planting typically takes place from late April to early May, once the threat of the last frost has passed. In Missouri, frost dates can vary by region, so be sure to check your local frost date to avoid potential frost damage to your tender tomato plants.
  • Advantages: Spring planting provides several advantages. It allows your tomatoes to establish strong root systems and enjoy a long growing season, resulting in robust plants and bountiful harvests. The mild spring weather is favorable for their initial growth.
  • Planting Depth: When planting your tomato seedlings, place them at a depth of around 1 to 1.5 inches, ensuring that the soil is workable and not overly waterlogged from spring rains.

Summer Planting

Summer planting also presents an opportunity for tomato cultivation in Missouri. Here’s what you should consider:

  • Optimal Timing: Summer planting typically occurs from late May to early June, once the weather is consistently warm. By this time, the risk of late frosts is minimal, ensuring that your tomato plants won’t be damaged by sudden cold snaps.
  • Benefits: Summer-planted tomatoes benefit from the warmth and extended daylight hours, promoting vigorous growth and an extended harvest. This approach is particularly suitable for those who might have missed the spring planting window.
  • Planting Depth: As with spring planting, ensure the soil is warm and workable. Sow tomato seedlings at a depth of 1 to 1.5 inches, maintaining proper spacing based on the variety’s specific requirements.
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Preparing the Tomato Bed

Properly preparing the tomato bed is essential for a successful harvest in Missouri. Here are the steps to consider:

  • Soil Preparation: Start by testing your soil’s pH and nutrient levels. Tomatoes thrive in well-drained soil with a slightly acidic to neutral pH. To improve soil fertility and structure, amend it with organic matter like compost.
  • Drainage: Adequate drainage is crucial to prevent waterlogged soil, which can lead to root rot. You may consider raised beds or ensuring that your garden soil drains well to avoid excessive moisture.
  • Location and Bed Size: Choose a sunny location for your tomato bed, providing at least six hours of sunlight daily. Select a bed size that corresponds to the number of tomato plants you plan to grow and respects the specific spacing requirements of your chosen tomato varieties.

By following these guidelines, you’ll create the optimal conditions for your tomato plants, whether you choose to plant them in the spring or summer. Proper bed preparation and timing are key to a successful tomato garden in the diverse climate of Missouri.

Planting and Caring for Tomatoes

Planting and caring for tomatoes in Missouri is a rewarding process that requires attention to detail:

  • Planting Depth and Spacing: When planting tomato seedlings, ensure they are placed at the recommended depth of about 1 to 1.5 inches. Proper spacing is essential. Typically, maintain a distance of around 18 to 24 inches between plants and 36 inches between rows, although this can vary depending on the specific requirements of your chosen tomato variety.
  • Watering: Tomatoes in Missouri require consistent moisture, particularly during critical growth stages like flowering and fruit development. Aim to provide approximately 1 inch of water per week, adjusting your watering routine according to rainfall. Be cautious not to overwater, as overly wet soil can lead to issues like root rot.
  • Mulching: Applying a layer of organic mulch, such as straw, around your tomato plants is beneficial. Mulch helps conserve soil moisture, suppress weeds, and regulate soil temperature, making it especially valuable during the warmer summer months when evaporation is more pronounced.
  • Fertilization: Tomatoes benefit from a balanced fertilizer during their growth cycle. It’s advisable to avoid high-nitrogen fertilizers, as these can encourage excessive foliage growth at the expense of fruit production. Follow recommended guidelines for fertilizing tomatoes to ensure healthy plant development.
  • Weeding: Regularly remove weeds from your tomato bed. Weeds compete with tomato plants for essential nutrients and water, which can potentially reduce your harvest. A weed-free environment supports healthier tomato growth and better yields.
  • Pest and Disease Management: Keep a vigilant eye for common pests that can affect tomatoes in Missouri, such as aphids and hornworms. Address any issues promptly to protect your crop. Additionally, ensure good airflow and proper spacing to reduce the risk of fungal diseases like Early Blight and Late Blight, which can thrive in humid conditions.
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Harvesting Tomatoes

Knowing when and how to harvest tomatoes is crucial for enjoying the best flavor and nutritional value from your homegrown tomatoes:

  • Harvesting Timing: Tomatoes are typically ready for harvest when they reach full color and firmness. At this stage, they should be easily removed from the vine without any resistance. Avoid harvesting tomatoes when they are still green and unripe.
  • Proper Picking: Use a sharp pair of garden shears or a knife to cut tomatoes from the plant, leaving a small stem attached. This helps prevent damage and disease entry points on the fruit.
  • Storage: Store freshly harvested tomatoes at room temperature, away from direct sunlight. Refrigeration can affect their flavor and texture, so it’s generally best to use them promptly. However, if you have an abundant harvest, consider preserving them through canning, freezing, or making sauces and salsas.


In conclusion, growing tomatoes in Missouri is a gratifying experience that can yield a delicious and abundant harvest if done with care and attention to the state’s unique climate. By selecting the right tomato varieties, timing your planting appropriately, and providing your plants with the care they need, you can savor the flavor of homegrown tomatoes throughout the season. Whether enjoyed fresh, canned, or used in a variety of culinary creations, your homegrown tomatoes are sure to be a source of pride and satisfaction in your Missouri garden.