UPDATE: Search and rescue teams have found the boy and they're in the process of hiking with him back to the Horsetail Falls trail head.
The 16-year-old boy was hiling with family Saturday afternoon when he became separated.
He was wearing a jacket with hood, blue sweat pants and hiking boots. He did not have emergency items with him.
Temperatures dropped into the 20s overnight.
An Oregon Army National Guard helicopter with a FLIR night vision camera searched overnight, but wasn't able to find the boy.