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Founded in 1979, the Shamrock Run is the largest running and walking event in Oregon and is the second largest running event on the US west coast.  In 2016, 35,000 participants will celebrate the 38th edition of the event on Sunday, March 13 at Waterfront Park in downtown Portland.  Shamrock has reached its field limit, and has "sold out," every year for the past six years.

The Shamrock Run offers competive races at 5 kilometers (3.1 miles), 8 kilometers (4.97 miles), 15 kilometers (9.3 miles) and a half-marathon (13.1 miles). Shamrock also has a 5km fitness walk – the Shamrock Stride – and a 1km (0.6-mile) run/walk for children age 10 and younger known as the "Leprechaun Lap."

All the courses run through the center of downtown Portland for a fun urban experience and feature slightly downhill final sections. The 15k and half-marathon routes include the challenging, and scenic,Terwilliger hills.

Shamrock Sunday activities in the finish area include the Widmer Brothers Brewing beer garden, free chowder from Stanford's and an entertainment stage with performances from local musicians.  Bands also perform at the starting line and along the Shamrock Run routes.

Shamrock Weekend kicks-off with the Shamrock Run Fitness Fair.  This two-day Health and Fitness Fair at the Oregon Convention Center on March 11-12 is in conjunction with Shamrock participant bib number and T-shirt pickup. The Fitness Fair features more than 80 running and fitness exhibitors, celebrities and mascots, contests and give-aways and a Leprechaun Lane kids area. More than 25,000 people visit the Shamrock Fitness Fair.

All Shamrock Run participants receive the following:

  • A souvenir Shamrock green short-sleeve poly blend runner's style T-shirt;
  • A free pour of Widmer Brothers beer (for those over 21);
  • A free serving of Stanford's signature smoked salmon chowder; and
  • A commemorative bottle-opener medallion (for 15km and half-marathon finishers only).

The Shamrock Run offers a reduced entry fee for members of teams with 15 or more participants. This entry fee incentive has resulted in the registration of more than 750 company, neighborhood or special interest teams, and has contributed significantly to the tremendous growth of the event, which has tripled in size in the last five years. Shamrock has also sold out every year since its field limit was implemented in 2010.

The Shamrock Run is sponsored by Widmer Brothers Brewing, Stanford's Restaurant and Bar, LifeWise Health Plan of Oregon, KGW TV, Live 95.5 Radio and OHSU Sports Medicine.  The primary beneficiary of the event is Doernbecher Children's Hospital Foundation, which has been affiliated with Shamrock for the past 19 years.