Summer Range: Marsh wrens breed from British Columbia to Maine, and southward throughout intermountain West and along all coasts southward to Mexico. In the western and southern United States the species is a year-round resident. There are also breeding and resident populations along coasts of the southern Atlantic and Gulf states. In migrant populations females usually arrive on breeding grounds seven to ten days after males and then mate with males a few days after arrival.
Winter Range: Not all Marsh Wrens migrate, but among those that do, the eastern and western populations end up in different wintering grounds. Eastern birds migrate to the Atlantic and Gulf Coasts, and the western birds migrate to Mexico and Texas.