In 1959 and 1960, Ruth Gruhn ...estimated... human habitation 14,500 years ago...using more advanced technology than existed in 1959, she concluded her original estimate of its first habitation was about right.
Subsequent research has shown that timeline is plausible. In 2006, Idaho State University archaeologists dug up stone tools from Castle Rocks State Park in Cassia County that they estimated were 16,000 years old.
not only was this during the ice age but
Geologists believe the first volcanic eruption at Craters of the Moon National Monument didn’t start until 15,000 years ago, and Clovis culture — until recently believed to mark the advent of humans in North America — didn’t emerge until 13,000 years ago.