Sedge wrens often lay 2 clutches per year. Incubation is done by the female and lasts for 12 to 14 days. The young are tended by both adults but primarily by the female. They leave the nest 12 to 14 days after hatching. The loss of wetland habitats through human development and degradation is the primary reason for the decline of sedge wren populations.
Sedge wrens are shy, elusive birds that are difficult to locate.
Breeding birds are most apt to be observed in Connecticut during mid-May, while migrants are more common in October. During the 1800s, the sedge wren was considered an uncommon summer resident, breeding in suitable habitats near coastal Connecticut and along the Connecticut River Valley. A decline in local populations occurred by the early 1900s. The bird has been considered a very rare migrant and sporadic nester in the state since the 1960s. Nationwide Breeding Bird Survey results from 1965 to 1979 reflected a continental decline in sedge wren populations.