The best time to plant tomatoes in Connecticut is after the last frost date, which is typically mid- to late May, depending on the location within the state. Tomatoes should be transplanted outdoors only when the danger of frost has passed and soil temperatures have warmed to around 65°F with daytime air temperatures averaging 55º to 60ºF. Tomato seedlings are usually started indoors about 6 to 8 weeks before the transplanting date, often between late March and early April. This indoor start allows plants to be well-developed (6 to 8 inches tall) before being moved outside around mid- to late May, typically near Memorial Day. In summary:
- Start tomato seeds indoors 6-8 weeks before expected last frost (late March to early April).
- Transplant tomatoes outdoors after last frost, mid- to late May, when soil and air temperatures are suitable.
This timeline suits Connecticut's climate, with an average last frost date around mid-May but varying from May 8 to June 4 depending on the city or region within the state.
