In the playoffs, the Angels defeated the Eastern Division champion Tulsa Oilers, for Seattle's last PCL pennant.

The Pilots would last but one year in Seattle, before a bankruptcy court sold the team to a group headed by Bud Selig and were moved to Milwaukee in 1970.

The team was a co-op operation in 1972, drawing players primarily from the San Francisco and Baltimore minor league systems.

Managed by former St. Louis Cardinals pitcher Ray Washburn, the Rainiers went into a tailspin in August and finished last in the NWL North Division.

The Rainiers came in with two second-place showings as the team groomed future major league pitchers Manny Sarmiento, Mike Armstrong and outfielder Lynn Jones during that time,[1] as well as manager Greg Riddoch.

One of those was outfielder Casey Sander, a Seattle native who played one season in 1975 before embarking upon an acting career, eventually landing a regular role in the longtime ABC-TV sitcom Grace Under Fire.

The 1976 team had the best showing of the Rainiers' five-season run, finishing second by one game to the Portland Mavericks in the NWL's Northern Division.

On September 1, 1976, Seattle shut out Portland 2-0, with local product George Meyring winning the final professional baseball game in Sicks' Stadium.