Red tomatoes

Best Planting Times for Tomatoes in Pennsylvania

Planting MethodActivityRecommended Dates
Outdoor PlantingIndoor Seed StartingMarch 15 – April 15
Transplant OutdoorsMay 15 – June 1
Greenhouse PlantingYear-roundAdjust planting based on temperature control in the greenhouse

Planting Conditions

Pennsylvania has a humid continental climate, with cold winters and warm, humid summers. The state falls within USDA Hardiness Zones 5a to 7a, offering a moderate growing season for tomatoes.

Sun Requirements

Tomatoes require full sun, with at least 6-8 hours of direct sunlight daily. Pennsylvania’s summer provides the necessary sunlight, but ensuring your plants get enough light is crucial for good growth.

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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.
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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 Pennsylvania, where the climate can be unpredictable with both cold winters and humid summers, a greenhouse is essential for providing a stable environment for your tomato plants. It allows you to start your plants earlier in the spring and continue growing them well into the fall, ensuring a steady and productive harvest.

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 Pennsylvania:

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

Starting Tomatoes Indoors

In areas like Philadelphia (Zone 7a), start tomato seeds indoors from March 15 to April 15. This timing allows seedlings to be ready for outdoor transplanting from mid-May to early June, after the last frost.

Transplanting Tomato Seedlings

Transplant seedlings outdoors from May 15 to June 1, once soil temperatures are consistently above 50°F. Space seedlings 24-36 inches apart in rows at least 36 inches apart to ensure proper air circulation and sunlight exposure.

General Care and Maintenance

Watering:

  • Water deeply and consistently to keep the soil evenly moist. Pennsylvania’s warm summers can dry out the soil quickly, making regular watering essential.
  • Water at the base of the plants to prevent wetting the foliage, reducing the risk of fungal diseases.

Fertilizing:

  • Apply a balanced fertilizer at planting and again when the first fruits begin to set. Adding compost to the soil before planting improves fertility and structure.

Pest and Disease Management:

  • Monitor for common pests like aphids, cutworms, and tomato hornworms. The humid climate can also encourage fungal diseases.
  • Use organic or integrated pest management strategies to protect your plants from pests and diseases.

Harvesting Tomatoes:

  • Harvest tomatoes when they are fully colored and firm. Regular harvesting during Pennsylvania’s peak summer months helps maintain quality and prevents overripening.
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