Is Polymarket legal in Washington?

Using Polymarket from Washington

Residents of Washington trade through the Polymarket US app. After you download it, you create an account, verify your identity, and confirm your location — Polymarket then enables trading for Washington.

Who can trade in Washington

You must be 18 or older (21+ in some jurisdictions) and complete identity verification. Polymarket markets cover politics, economics, crypto, sports, and culture — settled on real-world outcomes. For the national picture, see where Polymarket is available and our guide to whether Polymarket is legal.

How to sign up from Washington

Download the Polymarket app, create your account, and enter bonus code COLLEGEPM at sign-up. New users can deposit $10, get a $25 trading bonus!

Sign up on Polymarket → (opens in a new tab)

21+. Gambling problem? Call 1-800-GAMBLER.

What changed in Washington

Court rulings, regulator actions and bills that affect prediction markets in Washington. Newest first. Checked against sources on October 1, 2026. This is a record of public events, not legal advice.

1. August 28, 2026

   Ninth Circuit rules for Nevada regulators in Kalshi case

   In KalshiEX v. Assad, a three-judge Ninth Circuit panel upheld the dissolution of an injunction that had protected Kalshi in Nevada, finding Kalshi had not shown that federal commodities law likely preempts Nevada gaming rules for its sports event contracts. The court sent Nevada's challenge to election contracts back to the district court.

   Source: U.S. Court of Appeals for the Ninth Circuit (opinion, No. 25-7516) (opens in a new tab)

2. August 19, 2026

   Kalshi begins blocking certain event contracts in Washington

   Following a King County Superior Court order, Kalshi began blocking sports, election and several other categories of contracts for Washington users, with full geofencing required by September 2.

   Source: Sports Betting Dime (opens in a new tab)

3. July 22, 2026

   Washington judge grants preliminary injunction against Kalshi

   Reported by Sports Betting Dime. King County Superior Court Judge John McHale found the state likely to succeed on claims that parts of Kalshi's offering violate the Washington Gambling Act and granted a preliminary injunction. The date shown is the report date.

   Source: Sports Betting Dime (opens in a new tab)

4. March 27, 2026

   Washington Attorney General sues Kalshi

   Attorney General Nick Brown filed a lawsuit alleging Kalshi violates the state Gambling Act and Consumer Protection Act, seeking to stop its operations in Washington and recover losses and penalties.

   Source: Washington State Attorney General (opens in a new tab)

21+. Gambling problem? Call 1-800-GAMBLER.

Frequently asked questions

Is Polymarket available in Washington?

Yes. The Polymarket app is available to eligible residents of Washington. You verify your identity and location when you create an account, and Polymarket confirms access at sign-up. Washington has taken action against other prediction market operators over sports event contracts: Washington's Attorney General sued Kalshi in March 2026, a state court granted a preliminary injunction (reported July 22, 2026), and Kalshi began blocking sports and other contracts for Washington users in August 2026. Polymarket is not named in those actions.

How old do I have to be to use Polymarket in Washington?

You must be 18 or older (21+ in some jurisdictions) and complete identity verification. Prediction-market positions are speculative and can result in loss of the funds you commit.

How do I get the Polymarket bonus in Washington?

New users in Washington can deposit $10, get a $25 trading bonus! by signing up through our link and entering bonus code COLLEGEPM. Terms are set by Polymarket and may change.