Yarnold took gold at the season opener in Whistler after Noelle Pikus-Pace was disqualified however the American wasn't to be denied for a second time.
Pikus-Pace took won on home ice in Park City but Yarnold was still second to retain the overall World Cup lead with world champion Shelley Rudman fourth again.
Donna Creighton was 21st while Dom Parsons, Kristan Bromley and Ed Smith were tenth, 18th and 26th respectively in the men's race with Yarnold having no serious issues.
"I'm delighted with my performance, we are racing every week and to expect to make the podium every time is a tall order," she said.
"It's only my third time on the Park City track so I'm chuffed to retain the yellow jersey for the second week.
"The -25conditions were tough, especially in a thin lycra suit so I really hope it warms up soon."
Meanwhile, back across the pond and across Europe into Igls, and Rose McGrandle underlined her desire to step up to the World Cup circuit at the Intercontinental Cup opener.
McGrandle, disqualified at the British World Cup selection trials, broke the track record twice as she won both of the races scheduled in Austria.
And she said: "I'm really pleased with the last two days. I broke the track record in training so I knew I had the possibility of sliding fast.
"But all the girls were posting some impressive times so it put the pressure on me to piece it all together and stay focussed.
"My coaches have been fantastic and I'm really happy I could win for them and the rest of the team."
© Sportsbeat 2013