Washington gambling law changes https://gamblingatlas.org/states/washington/ New laws, launches, tax changes and enacted bills on gambling in Washington. en-us Mon, 12 Oct 2026 12:00:00 GMT Ninth Circuit rules against Kalshi on CFTC-preemption grounds in KalshiEX v. Assad (Nevada), consistent with Washington's state-court position https://gamblingatlas.org/states/washington/#timeline event:WA:2026-08-28:Ninth Circuit rules against Kalshi on CFTC-preemption ground Fri, 28 Aug 2026 12:00:00 GMT King County Superior Court issues final order requiring Kalshi to cease offering wagers on sports, elections, politics, entertainment, culture, and tech/science to Washington residents, with geofencing deadlines of Aug. 19 and Sept. 2, 2026 https://gamblingatlas.org/states/washington/#timeline event:WA:2026-08-13:King County Superior Court issues final order requiring Kals Thu, 13 Aug 2026 12:00:00 GMT Court grants preliminary injunction barring Kalshi from offering sports/political/entertainment event contracts to Washington residents, with geofencing ordered and daily fines threatened https://gamblingatlas.org/states/washington/#timeline event:WA:2026-07:Court grants preliminary injunction barring Kalshi from offe Wed, 01 Jul 2026 12:00:00 GMT Washington Attorney General sues Kalshi in King County Superior Court over sports and political event contracts offered to state residents https://gamblingatlas.org/states/washington/#timeline event:WA:2026-03:Washington Attorney General sues Kalshi in King County Super Sun, 01 Mar 2026 12:00:00 GMT U.S. Supreme Court denies certiorari in RunItOneTime (fka Maverick Gaming) v. United States, leaving tribal exclusivity intact https://gamblingatlas.org/states/washington/#timeline event:WA:2025-10-06:U.S. Supreme Court denies certiorari in RunItOneTime (fka Ma Mon, 06 Oct 2025 12:00:00 GMT No. 24-1161 Ninth Circuit affirms dismissal of Maverick Gaming's challenge to tribal sports-betting exclusivity https://gamblingatlas.org/states/washington/#timeline event:WA:2024-12:Ninth Circuit affirms dismissal of Maverick Gaming's challen Sun, 01 Dec 2024 12:00:00 GMT Western District of Washington dismisses Maverick Gaming's suit on Rule 19 required-party grounds (Shoalwater Bay Indian Tribe) https://gamblingatlas.org/states/washington/#timeline event:WA:2023:Western District of Washington dismisses Maverick Gaming's s Sun, 01 Jan 2023 12:00:00 GMT Maverick Gaming sues the United States and Washington tribes challenging tribal sports-betting exclusivity https://gamblingatlas.org/states/washington/#timeline event:WA:2022:Maverick Gaming sues the United States and Washington tribes Sat, 01 Jan 2022 12:00:00 GMT Snoqualmie Casino becomes first Washington tribal casino to launch sports wagering https://gamblingatlas.org/states/washington/#timeline event:WA:2021-12-09:Snoqualmie Casino becomes first Washington tribal casino to Thu, 09 Dec 2021 12:00:00 GMT Governor signs HB 2638 authorizing tribal sports wagering compact amendments https://gamblingatlas.org/states/washington/#timeline event:WA:2020-03-25:Governor signs HB 2638 authorizing tribal sports wagering co Wed, 25 Mar 2020 12:00:00 GMT 2020 Wash. Laws ch. 170 (HB 2638) Gambling Commission restricts cash/gift-card payouts on Class 12 skill-game amusement devices amid slot-machine-lookalike concerns https://gamblingatlas.org/states/washington/#timeline event:WA:2016:Gambling Commission restricts cash/gift-card payouts on Clas Fri, 01 Jan 2016 12:00:00 GMT Washington's Lottery joins Powerball https://gamblingatlas.org/states/washington/#timeline event:WA:2009:Washington's Lottery joins Powerball Thu, 01 Jan 2009 12:00:00 GMT Washington's Lottery joins Mega Millions https://gamblingatlas.org/states/washington/#timeline event:WA:2002:Washington's Lottery joins Mega Millions Tue, 01 Jan 2002 12:00:00 GMT Initiative 728 passed, redirecting a share of lottery/gambling-related revenue toward education https://gamblingatlas.org/states/washington/#timeline event:WA:2000:Initiative 728 passed, redirecting a share of lottery/gambli Sat, 01 Jan 2000 12:00:00 GMT Washington signs its first tribal-state Class III gaming compact, with the Tulalip Tribes https://gamblingatlas.org/states/washington/#timeline event:WA:1992:Washington signs its first tribal-state Class III gaming com Wed, 01 Jan 1992 12:00:00 GMT Washington's Lottery sells its first game, the "Pot O'Gold Instant Lottery" scratch ticket https://gamblingatlas.org/states/washington/#timeline event:WA:1982-11-15:Washington's Lottery sells its first game, the "Pot O'Gold I Mon, 15 Nov 1982 12:00:00 GMT Gov. John Spellman signs House Bill 1251, creating Washington's Lottery https://gamblingatlas.org/states/washington/#timeline event:WA:1982-07-16:Gov. John Spellman signs House Bill 1251, creating Washingto Fri, 16 Jul 1982 12:00:00 GMT Constitutional amendment (Article II, Section 24) allows the legislature to authorize certain gambling activities https://gamblingatlas.org/states/washington/#timeline event:WA:1972:Constitutional amendment (Article II, Section 24) allows the Sat, 01 Jan 1972 12:00:00 GMT Washington Supreme Court finds law permitting club slot machines unconstitutional under the state lottery ban https://gamblingatlas.org/states/washington/#timeline event:WA:1952:Washington Supreme Court finds law permitting club slot mach Tue, 01 Jan 1952 12:00:00 GMT Washington Horse Racing Commission established, reauthorizing pari-mutuel wagering https://gamblingatlas.org/states/washington/#timeline event:WA:1933:Washington Horse Racing Commission established, reauthorizin Sun, 01 Jan 1933 12:00:00 GMT