The fire started at about 11:40 a.m. near Sea Breeze Road, about 10 miles northwest of Mountain Home.
The fire started in a mobile home, then spread to another mobile home and an outbuilding. It then spread to grass and brush, burning down about six acres.
In addition to BLM fire crews, firefighters from the Mountain Home Rural Fire Department and Oasis Rural Fire Department also responded.
The BLM said a quick response by the fire agencies saved other nearby structures.
The cause of the fire is under investigation.