Red tomatoes

Best Planting Times for Tomatoes in New Hampshire

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

Planting Conditions in New Hampshire

New Hampshire has a humid continental climate with cold winters and warm, humid summers, falling within USDA Hardiness Zones 3b to 5b. The relatively short growing season requires careful timing for successful tomato cultivation.

Sun Requirements

Tomatoes in New Hampshire need full sun, with at least 6-8 hours of direct sunlight each day. Given the state’s shorter summer days, ensuring that tomato plants receive adequate sunlight is crucial for 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 New Hampshire, where the growing season can be limited by cooler temperatures, a greenhouse is essential for extending the season. It allows you to start your tomato plants early in the spring and continue growing them well into the fall. With proper heating, you can even protect your plants from frost and potentially grow tomatoes year-round.

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 New Hampshire:

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

Starting Tomatoes Indoors

In areas like Concord (Zone 5a), start tomato seeds indoors from April 1 to May 1. This schedule ensures seedlings are ready for outdoor transplanting from mid-May to early June, once the risk of frost has passed.

Transplanting Tomato Seedlings

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

General Care and Maintenance

Watering:

  • Water consistently to maintain moist soil. New Hampshire’s summer climate can vary, so adjust watering to ensure the soil remains evenly moist without becoming waterlogged.
  • Water at the base of the plants to prevent wetting the foliage, which helps reduce 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 can improve fertility, especially in New Hampshire’s often rocky soils.

Pest and Disease Management:

  • Monitor for common pests like aphids, cutworms, and tomato hornworms. The cooler, humid climate can also encourage fungal diseases, so vigilance is important.
  • 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. Given New Hampshire’s shorter growing season, consider picking tomatoes slightly before full ripeness if an early frost threatens, allowing them to ripen indoors.
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