The fire, southwest of Mt. Vernon in the Riley Creek area, was initially called in by Mt. Vernon Fire Department just after 9:30 p.m., according to John Day dispatch.
Mt. Vernon Fire Department, John Day Fire Department, Canyon City Fire Department and the United States Forest Service responded and contained the fire by 1 a.m., according to dispatch.
No structures were damaged, and no injuries were reported. The cause of the grass fire is currently unknown, but dispatch received reports of a number of lightning-caused fires.