Thank you to the participants, sponsors and volunteers who have made the the Mercer Island Half Marathon possible for over forty-five years!  The Mercer Island Half Marathon will unfortunately not be taking place either in-person or virtually in 2021.  Please check back later in the year for updates on our 2022 event.


Join thousands of competitive athletes, recreational runners, walkers and active families for the Spring kick-off event to Puget Sound’s running season! All monies raised support awareness for both Colon Cancer prevention and for local and international Rotary endorsed charities.

Thank you for supporting the Foundation of the Rotary Club of Mercer Island which is registered with Washington state’s Charities Program as required by law.  Additional information is available by calling 800-332-4483 or visiting