A Custer County fire Wednesday, forced crews to battle a blaze for seven hours, in the heat.

Callaway Volunteer Fire Chief, Charles Jorgenson says a hay swather started the fire, eight miles east of Callaway.

Officials think a hot bearing started the blaze around 2 p.m.

It quickly spread into pasture with a lot of cedar trees.

Volunteers from Callaway, Arnold, Ansley, Broken Bow, Merna, and Oconto were on the scene until 9 p.m.

500 acres were charred.