The Wilson fire, burning south of Roundup, is now 80 percent contained, officials reported.
For a time on Sunday, the fire forced emergency crews to shut down Highway 87, which connects Roundup and Billings. The road was reopened Monday morning.
The fire has burned 4,200 acres. It's believed to be human-caused. The main body of the fire was burning five miles south of Roundup on the east side of Highway 87 and north of Johnnys Coal Road.