Fraxinus tomentosa has until recently been considered a very rare component of Ohio’s swamp forest communities. Until 1992 only four populations were known in Ohio, all in the extreme southwest corner of the state. Intensive fieldwork in 1992 focusing on locating additional F. tomentosa populations resulted in finding 28 new sites in 11 counties. These populations were scattered throughout the glaciated till plains and the lake plain of Lake Erie, revealing a much wider distribution in Ohio than was previously suspected. As a consequence of this survey F. tomentosa was located for the first time in Michigan and Pennsylvania.