The latest attack happened on Tuesday as an unidentified Ohio man hunted in the western Graville Mountains, according to a Montana wildlife news release. The man survived and is being treated at a local hospital, officials said.
He was walking through destroyed timber when the bear attacked from close range.
"During the incident, the man fired multiple shots at the bear as she left. The man was able to meet with other members of his hunting party and receive medical attention," the statement said.
His incident was about eight miles south of where three other hunters were injured on September 16 in two separate attacks on a grizzly bear.
Montana wildlife officials are urging people to stay out of the Coal River and Twin Springs area as the investigation continues.
The Grizzly Bears are listed as endangered by the Endangered Species Act.
"As the geographic range of grizzly bears expands in Montana, density in this range also increases … As grizzly populations become more dense and widespread, conflicts with humans are likely to increase," they say from Montana fish wildlife and parks.
Bears are more active in the fall months as they look for calorie-rich foods to prepare for hibernation. Most attacks occur during surprising close encounters.