The casino gambling age in Washington state is 18 under state law, but in practice many casinos require you to be 21. The difference comes down to alcohol: any casino or card room that serves liquor on the gaming floor has to keep everyone under 21 out of that area, regardless of the gambling statute. So the age that applies to you depends on the specific facility you plan to visit.
What State Law Sets as the Minimum
RCW 9.46.228 makes it unlawful for anyone under 18 to play authorized gambling activities in Washington, including card games, punchboards, and pull-tabs.1Washington State Legislature. Washington Code 9.46.228 – Gambling Activities by Persons Under Age Eighteen Prohibited Minors can play bingo, raffles, and amusement games only when commission rules specifically allow it.
The state lottery follows a separate chapter but lands on the same number. Under RCW 67.70.120, lottery tickets cannot be sold to anyone under 18, though an adult can buy a ticket as a gift for a minor.2Washington State Legislature. Washington Code 67.70.120 – Ticket or Share Sales
So 18 is the statutory floor for casino-style gambling. It is not the whole story.
Why Most Casinos Require 21
Washington’s liquor laws work independently from its gambling laws, and when the two overlap, the stricter rule controls. Under RCW 66.44.310, it is a misdemeanor for anyone under 21 to enter or remain in an area that the Washington State Liquor and Cannabis Board has classified as off-limits to minors. The Board can designate portions of any licensed premises as restricted to those 21 and older.3Washington State Legislature. Washington Code 66.44.310 – Minors Frequenting Off-Limits Area
When a casino or card room integrates alcohol service directly onto the gaming floor, the entire floor becomes off-limits to anyone under 21. An 18-year-old who could legally gamble under the gambling statute still cannot enter if the venue holds a spirits, beer, and wine license for that space. Facilities that want to admit 18-year-olds for gambling generally keep the bar area physically separated from the gaming tables. Venues that do not create that separation default to 21-and-over to protect their liquor license.
Restaurants and hotel areas within a casino property that are separately designated by the Board may still allow people under 21, but the gaming floor is the area that matters. If you are between 18 and 20, call the specific casino and ask before making the drive.
Tribal Casinos Set Their Own Age
Washington’s 29 federally recognized tribes operate casinos under tribal-state compacts, which are formal agreements that grant tribes authority to set their own operational rules. Those compacts are negotiated by the director of the Washington State Gambling Commission, not the Governor.4Washington State Gambling Commission. Tribal Gaming Compacts and Amendments
Because each tribe negotiates its own compact, the minimum patron age varies from one facility to the next. Many tribal casinos admit gamblers at 18. Others set the floor at 21, often because they serve alcohol throughout the gaming floor. A person who plays slots at one tribal casino without issue could be turned away at another casino a few miles down the road. Check the facility’s website or call ahead.
Commercial Card Rooms
Commercial card rooms are a different category from tribal casinos. They offer house-banked card games under state licensing and follow the 18-and-over rule set by the Washington Administrative Code.5Washington State Gambling Commission. Administrative Rules Outline Nonhouse-Banked Card Room They are more limited than tribal casinos in what they can offer: no slot machines, no sports betting, and a maximum single wager of $400 on house-banked games.6Washington State Gambling Commission. Notice of Permanent Rule Changes Related to Wager Limits at House-Banked Card Rooms
Even with the 18 floor, a card room that serves alcohol in the gaming area will typically restrict entry to 21 and older. Whether you can get in at 18 depends on whether the venue physically separates its gaming area from zones where liquor is served.
Sports Betting and Horse Racing
Sports betting in Washington was legalized on a limited basis through House Bill 2638 and is restricted entirely to tribal casinos that have amended their Class III gaming compacts.7Washington State Gambling Commission. Sports Wagering Requirements and Rules The minimum age for placing a sports wager depends on the individual tribe’s compact and internal rules. Most tribal sportsbooks require bettors to be 21.
Mobile sports betting exists, but only inside a geofence drawn around a tribe’s land. Step outside the boundary and the app stops working. Statewide mobile sportsbooks are not permitted.
Horse racing is the outlier that catches people off guard. Advance deposit wagering accounts, the primary way to bet on races remotely, require the account holder to be at least 21.8Washington State Legislature. Washington Code 67.16 – Horse Racing
Bring Valid ID
Every casino and card room in Washington will ask for ID before letting you onto the gaming floor, and again when you collect a significant payout. The standard accepted forms are a valid state driver’s license, a current passport, a tribal enrollment card with a photo, or a federal military ID. Without valid identification, expect to be denied entry or to have a payout held.
Penalties for Gambling Underage
Gambling while under 18 is a class 2 civil infraction in Washington, not a criminal offense. The penalties include a fine of up to $125, up to four hours of community service, court costs, and forfeiture of all winnings.9Washington State Gambling Commission. Illegal Gambling Activities Forfeited winnings do not go to the casino or the Gambling Commission; they are directed to the Department of Social and Health Services for youth problem gambling programs.1Washington State Legislature. Washington Code 9.46.228 – Gambling Activities by Persons Under Age Eighteen Prohibited Juvenile courts handle these cases.
Adults who knowingly allow a minor to gamble face more serious exposure. Under the general gambling statute, knowingly permitting underage participation is a misdemeanor, which can mean up to 90 days in jail and a fine of up to $1,000.10Washington State Legislature. Washington Code 9A.20.021 – Maximum Sentences for Crimes Committed Operators also risk enforcement action from the Gambling Commission, which can suspend or revoke gaming licenses.
The short version: state law lets you gamble at 18, but a large share of Washington casinos require 21 because of how they handle alcohol. Confirm the age policy with the specific venue before you go.