Charlie Reynolds, 22, and Korina Reynolds, 20, were last seen driving a 1987 Ford Ranger 4X4 silver and black pick-up, Oregon license TDC-841.
Polk County Sheriff's Office has continued searching the coast range mountains west of Falls City for the missing couple from Independence.
Searchers from Yamhill and Marion County Search and Rescue continue their assistance in a joint operation.
Due to low cloud cover, the Oregon National Guard 1042nd Medical Unit will remain on the ground unless conditions improve later today.
Additional snow in the area overnight was generally light with scattered snow showers early this morning.
There still has been no sign of the missing couple or their vehicle.
Efforts will continue throughout the day using vehicles and snowmobiles.