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Root Sports Northwest was launched in late 1988 as Northwest Cable Sports, by Tele-Communications Inc. (TCI) and Viacom. Early programming included games from Washington and Washington State Universities and Tacoma Stars soccer games. By 1989, it affiliated with the newly formed Prime Sports Network and was rebranded Prime Sports Northwest.
In 1996, News Corporation, which formed a sports division for the Fox network two years earlier after it obtained the broadcast rights to the National Football Conference (NFC) and sought to create a group of regional sports networks, acquired a 50% interest in the Prime Network from TCI's successor Liberty Media. Later that year on November 1, News Corporation and Liberty Media relaunched the Prime Network affiliates as part of the new Fox Sports Net group, with the Seattle-based network officially rebranding as Fox Sports Northwest. The channel was rebranded as Fox Sports Net Northwest in 2000, as part of a collective brand modification of the FSN networks under the "Fox Sports Net" banner. Subsequently, in 2004, the channel shortened its name to FSN Northwest, through the networks' de-emphasis of the "Fox Sports Net" brand.
On December 22, 2006, News Corporation sold its interest in FSN Northwest and sister networks FSN Utah, FSN Pittsburgh and FSN Rocky Mountain to Liberty Media, in an asset trade in which News Corporation also 16.3% traded its 38.5% ownership stake in satellite provider DirecTV for $550 million in cash and stock, in exchange for Liberty Media's stake in the company. On May 4, 2009, DirecTV Group Inc. announced it would become a part of Liberty's entertainment unit, part of which would then be spun off into the separate company under the DirecTV name, in a deal in which Liberty would increase its share in DirecTV from 48% to 54%, with Liberty owner John Malone and his family owning a 24% interest. DirecTV would operate its newly acquired FSN-affiliated networks through DirecTV Sports Networks, a new division formed when the split from Liberty Media was completed on November 19, 2009.
On December 17, 2010, DirecTV Sports Networks announced that its four Fox Sports Networks-affiliated regional outlets would be relaunched under the "Root Sports" brand. The network officially rebranded as Root Sports Northwest on April 1, 2011, with The Dan Patrick Show as the first program under the new Root Sports branding. For nominal purposes, the Root Sports networks continued to carry programming distributed mainly to the Fox Sports regional networks to provide supplementary sports and entertainment programming.
In April 2013, the Seattle Mariners announced that they would acquire controlling interest (a 71% stake) in Root Sports Northwest, as part of a long-term extension of its contract with the team through the 2030 season. DirecTV remained a minority stakeholder (29% stake) and controlling partner, and the network continued to operate under the Root Sports brand.
DirecTV was subsequently acquired by AT&T; on July 14, 2017, its sister networks were re-branded as AT&T SportsNet. The Mariners chose not to rebrand Root Sports Northwest under the AT&T SportsNet banner, though the channel did adopt AT&T SportsNet's graphics package.
Ahead of their 2021–22 seasons, Root Sports Northwest acquired the regional rights to both the Portland Trail Blazers of the NBA, and the Seattle Kraken, a new NHL expansion franchise which began play that season. On September 30, 2021, Dish Network's carriage agreements for Root Sports Northwest, and AT&T SportsNet Pittsburgh and Rocky Mountain expired. Shortly thereafter, DirecTV announced an agreement to carry the channel on its satellite TV service and on DirecTV Stream, its streaming service.
In October 2021, Root Sports added an overflow channel, known as Root Sports Plus, to avoid scheduling conflicts with the Mariners, Kraken, and Blazers. Also that month, Root Sports, along with sister networks AT&T SportsNet Pittsburgh, and AT&T SportsNet Rocky Mountain, was removed from Dish Network satellite and Sling streaming TV services. FuboTV added Root Sports Northwest in that month and became the first streaming-only television provider to offer the channel, after neither Hulu nor YouTube TV signed a carriage agreement.
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After the announcement that Warner Bros. Discovery (WBD) would leave the regional sports network business in March 2023, Patrick Crumb, Seattle-based president of AT&T SportsNet operations, said that Root Sports would not be affected. Comcast told customers on October 10, 2023, that it moved Root Sports Northwest to its highest-priced "Ultimate" tier, angering many sports fans. The carrier offered a discounted upgrade fee for six months. In December of that year, The Seattle Times reported that the Mariners would acquire full control of Root Sports at the beginning of 2024, and that WBD would no longer produce Mariners telecasts. As of December 2023, Comcast had about 1.2 million subscribers in the Mariners' home market, down by 65% from 3.4 million in 2014.
In the 2025 season, MLB Local Media assumed production duties for Mariners broadcasts on Root Sports, and the network introduced a direct-to-consumer (DTC) streaming subscription known as Root Sports Stream. On September 26, 2025, days before the end of the Mariners' regular season, the team announced that Root Sports would close, with MLB Local Media taking over the team's distribution rights the following year. As the Mariners already directly employed the network's talent and crew, no on-air staff changed, although more than 25 network staffers were expected to be laid off on or around November 3. Root Sports Northwest's streaming platform shut down on December 14, with the channel officially ceasing operations on December 31. The Mariners worked with MLB Local Media to create Mariners.TV as a streaming and broadcast replacement for the 2026 season, with KING-TV and 21 other stations agreeing to air 10 games on terrestrial television throughout the team's broadcast region.
From Wikipedia’s article on Root Sports Northwest, shared under CC BY-SA 4.0.4