When should I start seeds indoors in Connecticut?

Short answer: Work backward from the outdoor conditions needed by the crop and the seed packet's indoor lead time. Connecticut gardens differ in frost risk and soil warming, so one indoor sowing date will not fit every crop or yard. Many seedlings benefit from several weeks of indoor growth before transplanting.

How to decide

Read each seed packet first

Identify whether the crop should be started indoors or direct-sown and note its recommended weeks before transplanting. UConn explains that indoor starting gives Connecticut gardeners a useful head start during a comparatively short warm growing season.

Work backward from local transplant readiness

Use a local frost history and current forecast as planning inputs, then account for crop-specific air and soil temperatures. Tomatoes and peppers generally need warmer outdoor conditions than many cool-season transplants. Do not treat a hardiness-zone label as an exact final frost date.

Give seedlings light and healthy starting conditions

Use a clean, suitable seed-starting medium instead of ordinary garden soil, which can compact and introduce disease organisms. Provide adequate light, moisture and airflow. Acclimate indoor seedlings gradually before transplanting outdoors.

Important: Starting too early can yield oversized seedlings with poor transplant performance. Seed packets and weather conditions take precedence over generic calendar dates. Check UConn recommendations for your particular crop.