The sister of the Duchess of Cambridge — the former Kate Middleton — finished the Vasaloppet ski race in seven hours, 13:36 minutes, alongside 15,800 competitors in bright sunshine.
Middleton told Swedish broadcaster SVT she had only prepared for the race for "a couple of weekends" and admitted it was tiring.
Pippa and her brother James, who clocked 06:47:27, raced to raise money for children's charity Magic Breakfast.
The competition is one of the world's oldest cross-country races and is based on Gustav Vasa's attempt to gather peasants for a revolt against occupying Danes in 1522.
The winner finished in three hours, 38.41 minutes.
