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.

[2] It is owned by the City of Granite Falls and located four nautical miles (7 km) south of its central business district.

It has one runway designated 15/33 with an asphalt surface measuring 4,350 by 75 feet (1,326 x 23 m).

[2] For the 12-month period ending August 31, 2006, the airport had 7,000 general aviation aircraft operations, an average of 19 per day.

At that time there were 15 aircraft based at this airport: 11 single-engine, 2 multi-engine and 2 jet.