At least 10 departments from two counties battled a barn fire, which spread to a field fire Wednesday afternoon south of Blair.
Firefighters and Washington County sheriff's deputies responded to an area near county roads 36 and 31 just after 2 p.m.
Blair, Fort Calhoun, Bennington, Irvington, Ponca Hills, Herman, Kennard and Arlington fire departments were all called to fight the blaze.
Waterloo and Valley were requested to provide tankers.
County Road 36 was blocked off to traffic.
Later Wednesday afternoon, firefighters were called to a second field fire near county roads 34 and 51.
