The Brief Tickets for potential Mariners postseason games go on sale this week, with both presale and public sale windows available. The Seattle Mariners have announced ticket on-sale dates for potential 2025 postseason games at T-Mobile Park, including Wild Card and Division Series matchups. When do Mariners postseason tickets go on sale? Fans who purchase postseason tickets directly through the Mariners will be refunded for any unplayed games. For complete postseason ticket details, visit Mariners.com/Postseason.