"I love skiing races here at Soldier Hollow," Bjornsen said, according to the U.S. Ski Team website. "I've been racing here since I was quite young, trying to qualify for Junior Olympics. I had good memories from the 15k last year at U.S. Championships and I tried to go out feeling a little confident, but also I was trying to ski smooth and strong and not be too confident. I knew there were a lot of fast guys. I didn't actually expect to win but I'm really happy that it worked out that way.
Niklas Persson (40:13.3) of the University of Utah placed 11th, and fellow Utah skier Oscar Ivers (40:26.4) was 13th.
Rorabaugh won the women's race in 29:09.9, followed by Caitlin Gregg (29:24.1) of Minneapolis, and Caitlin Patterson (29:49.7) of Anchorage, Alaska.
"I was having trouble believing splits halfway through that I was in second," Rorabaugh said. "I felt really strong, but mostly I felt like I was racing really hard at altitude, trying to hold it together so I'm pretty amazed. It was an awesome day."
Sloan Storrey (31:36.7) of the University of Utah finished 13th, and fellow Ute Anna-Lena Heynen (31:56.3) finished 18th.
Sprint races will be held on Sunday, with qualifiers beginning at 10:15 a.m. and heats at 12:30 p.m.