This website reviews results from 1999 through 2025 of the marathon-length American Birkebeiner cross-country ski race. A large dataset containing 113,000+ individual results from 27,000+ competitors was assembled to address a number of interesting questions. The primary focus is on how age affects performance, but it also provides other analyses of demographics and historical trends.
Also included is an updated ability to search results from 1999 to 2026.
This site is currently being revised to update charts and tables to include 2026 results.
For more, see Overview.