This is a list of seasons played by the Portland Timbers in American soccer, from 1975, when the original club first competed in the North American Soccer League, through the most recent completed season. All four incarnations of the Portland Timbers are represented. This list details the club's achievements in all competitions and the top scorers for each season. Records of friendlies and preseason tournaments are not included. Totals include the records and statistics of all four iterations of the club.[1][2]