In Massachusetts, tomatoes should be planted outdoors after the danger of frost has passed and when temperatures average 55 to 60°F. This typically means planting tomato transplants during the first week of May to the second week of June, depending on the location in the state. A classic and safe time to plant is around the middle to end of May, often around Memorial Day weekend. Starting seeds indoors is recommended about 6 to 8 weeks before the average last frost date, which for many parts of Massachusetts is around mid- May. For example, starting seeds indoors in mid to late March and then transplanting outdoors in mid to late May is a common practice. When planting, tomato plants should be spaced appropriately, and it’s best to set them deep enough so they develop roots along the stem. Also, be mindful that tomatoes need warmth to grow well, so planting should be timed to avoid cold soil and frost risk. Summary:
- Plant tomatoes outdoors: Mid-May to early June (after frost risk)
- Safe planting period: Often around Memorial Day weekend
- Start seeds indoors: 6-8 weeks before outdoor planting, around mid to late March
- Planting temperature: Soil and air temperatures averaging 55-60°F
- Space plants 12-18 inches apart if staked; 3 feet if unstaked for vining types
These details help ensure tomatoes have a good growing season in Massachusetts.
