In July 1939, Farrell starred in the lead role in the play "Anna Christie" at the Westport Country Playhouse, then followed that with a summer stock production of S. N. Behrman's play "Brief Moment". She co-starred with Lyle Talbot and Alan Dinehart in the long-running play "Separate Rooms" at Broadway's Plymouth Theater for a successful 613-performance run throughout 1940 and 1941. She appeared in the Broadway plays "The Overtons" in 1945 and "Home is the Hero" by Walter Macken in 1954.