Red tomatoes

Best Planting Times for Tomatoes in Maryland

Planting MethodActivityRecommended Dates
Outdoor PlantingIndoor Seed StartingMarch 1 – April 1
Transplant OutdoorsMay 1 – May 31
Greenhouse PlantingYear-roundAdjust planting based on temperature control in the greenhouse

Planting Conditions

Maryland’s climate is humid subtropical in the southern and eastern parts, with some temperate influences in the western regions. The state falls within USDA Hardiness Zones 6a to 8a, offering a relatively long growing season for tomatoes.

Sun Requirements

Tomatoes thrive in full sun, needing a minimum of 6-8 hours of direct sunlight each day. Maryland’s climate provides ample sunshine, especially during the summer months.

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Useful Tools for Starting Tomatoes Indoors

Using the right tools can save you time and increase your success rate.

Seeds

Quality seeds lead to better germination and healthier plants. Starting with high-quality seeds gives your tomatoes the best chance to thrive from the very beginning.
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Browse Tomato Seeds on Amazon

Planting Trays

Planting trays help you organize your seedlings and ensure they have enough space to grow before you transplant them outdoors. This makes the process more efficient and increases the chances of strong, healthy plants.
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Grow Lights

Grow lights are essential if you don’t have enough natural sunlight. They provide your seedlings with the light they need to grow strong and healthy, even in less-than-ideal conditions.
Grow Lights Image
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Seed Starting Soil

Using light, fine soil specifically designed for seed starting helps young roots establish quickly and promotes healthy growth. It’s an easy way to give your seedlings the best start possible.
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Greenhouse Growing

In Maryland, where the growing season can be extended with the help of a greenhouse, you can start your tomato plants early in the spring and continue growing them into the fall. A greenhouse also helps protect your plants from unexpected weather changes, ensuring a more consistent growing environment.

Currently, the 8x10x7.5 FT Greenhouse is priced at $999. It’s a great investment for ensuring your tomatoes thrive all year round.
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Check the latest price on Amazon.

Fertilizer

Fertilizer is essential to provide your tomato plants with the nutrients they need for strong growth and a successful harvest.
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Other planting guides for Maryland:

Any questions on growing tomatoes? Visit our forum to discuss: Growing Tomatoes

Starting Tomatoes Indoors

In areas like Baltimore (Zone 7b), start tomato seeds indoors from March 1 to April 1. This timing ensures seedlings are strong enough to be transplanted outdoors in May, after the last frost has passed.

Transplanting Tomato Seedlings

Transplant seedlings outdoors from May 1 to May 31, ensuring soil temperatures are consistently above 60°F. Space the seedlings 24-36 inches apart in rows that are at least 36 inches apart to allow for good air circulation and light exposure.

General Care and Maintenance

Watering:

  • Keep the soil consistently moist with deep, regular watering. Maryland’s humid climate can lead to fluctuations in soil moisture, so maintaining an even level is key.
  • Water the plants at the base to prevent wetting the leaves, which can help avoid fungal diseases.

Fertilizing:

  • Fertilize at planting and again when the first fruits set. Incorporating compost into the soil before planting enhances fertility and improves soil structure, which is particularly important in Maryland’s often clay-heavy soils.

Pest and Disease Management:

  • Watch for common pests such as aphids, whiteflies, and tomato hornworms. The humid climate can also increase the risk of fungal diseases.
  • Use integrated pest management techniques and organic methods to keep plants healthy.

Harvesting Tomatoes:

  • Harvest tomatoes when they are fully colored and firm. Frequent harvesting is recommended during Maryland’s peak summer months to prevent overripening and maintain quality.
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