Shamrock Run Portland is an annual running event held in Portland, Oregon. It features a variety of race distances, including a 5k, 8k, 15k, and half marathon, as well as a kids' run. Participants are encouraged to wear green and festive attire to celebrate St. Patrick's Day. The event typically draws thousands of runners of all ages and abilities, making it a fun and festive way to kick off the spring running season. In addition to the races, there are also post-race festivities, including live music, food, and beer.