Granite Falls Municipal Airport (ICAO: KGDB, FAA LID: GDB, formerly 1G2), also known as Lenzen-Roe Memorial Field (or Lenzen-Roe-Fagen Memorial Field), is a public-use airport in Yellow Medicine County, Minnesota, United States. It is owned by the City of Granite Falls and located four nautical miles (7 km) south of its central business district. The airport is situated near State Highway 23.