Authorities said DeYoung failed to return home from a Sunday skiing trip on Mt. Bachelor and was believed to have skied beyond the resort's boundaries.
More than a dozen sheriff's Search and Rescue teams were deployed Monday morning across a wide area, including the 9,068-foot summit of the mountain, where temperatures plunged to the 20s overnight after a warm and sunny Mother's Day of skiing on recent fresh powder.
The Jefferson County Sheriff's Office brought its "quads" (tracked ATVs) to help cover more of the challenging terrain.
Mt. Bachelor Ski Patrol contacted Deschutes County sheriff's dispatchers around 1:25 p.m. Sunday, seeking the assistance of Search and Rescue to find a missing skier, said sheriff's Lt. Chad Davis.
Ski patrollers had found ski tracks that went through the east "catch line," one of the boundaries of the ski area. They were unable to find the skier who made the tracks.
The ski patrol later spoke with the father of DeYoung and learned he was missing and may be associated with the tracks, Davis said.
Deputies said DeYoung had bought a ski pass for the day and it was last used around 9:10 a.m. Sunday at a turnstile on the mountain.
The SAR unit set up its incident command trailer in the parking lot near the ski resort's administration building, as teams checked ski area boundaries and nearby sno-parks and trails around the mountain, on a day that fortunately brought sunny skies and temperatures on the slopes rising above freezing in the afternoon.
To make things more challenging for SAR and deputies, another search took place Sunday night for a group that set out from Paulina Lake Lodge and failed to return home. They were found late Sunday night in the China Hat area south of Bend, where their vehicle had broken down, Davis said.