The Class A Short-Season Canadians (24-10) defeated the Everett Aquasox, 3-2, in eight innings to punch their ticket to the playoffs for the first time since 2005.
Douglas Landaeta scored the go-ahead run in the top of the eighth inning on John Housey's wild pitch after smacking a leadoff double to left field.
A.J. Griffin struck out the side in the eighth for his league-leading 15th save, giving Daniel Tenholder his fourth win of the year. Starter Nathan Long allowed two runs on six hits and three walks while striking out five over six innings.
Vancouver finished the first half of the season 10 games behind the Aquasox with a 17-21 record, but a Northern League-best 13-3 home record in the second half led the Canadians to the postseason. They will host the Aquasox in Game 1 of the Western Division series Monday.
The last time the Canadians went to the playoffs, they fell to Eastern Division champion Spokane in five games.
Offensively, Vancouver is paced by A.J. Kirby-Jones, who leads the team in homers (13) and RBIs (41), and Long, who has a 3.10 ERA and eight wins, one off the short-season lead by the Brooklyn Cyclones' Chris Hilliard (9-1).