Red tomatoes

Best Planting Times for Tomatoes in Vermont

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

Vermont has a humid continental climate, with cold winters and warm, humid summers. The state falls within USDA Hardiness Zones 3b to 5a, making the growing season for tomatoes relatively short and requiring careful timing.

Sun Requirements

Tomatoes need full sun, with at least 6-8 hours of direct sunlight daily. Vermont’s summer days provide sufficient sunlight, but ensuring that plants receive adequate light is key for healthy growth.

Starting Tomatoes Indoors

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

Transplanting Tomato Seedlings

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

General Care and Maintenance

Watering:

  • Water deeply and consistently to keep the soil evenly moist. Vermont’s warm summers can dry out the soil, making regular watering essential.
  • 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 and soil structure.

Pest and Disease Management:

  • Monitor for common pests like aphids, cutworms, and tomato hornworms. The humid climate can also encourage fungal diseases, so vigilance is necessary.
  • 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. Frequent harvesting during the short summer months helps make sure the best quality fruit and prevents overripening.
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