Is Polymarket Legal in Idaho? Polymarket US Status (September 2026)

Status as of September 25, 2026 · every line has its source and date · not legal advice

Status at a glance

Kalshi and Polymarket US are reported live in Idaho, including sports, even though sports betting is not legal there. No enforcement action was found; Attorney General Raúl Labrador has publicly opposed the CFTC's claim of exclusive authority over sports event contracts and has joined seven multistate amicus briefs in Kalshi cases and the 41-attorney-general comment letter to the CFTC, plus a 39-state brief in Crypto.com's Nevada appeal.

What has happened in Idaho

Service	Idaho
Polymarket US (CFTC-regulated app)	Reported available
polymarket.com (international site)	No new trades for US users
Kalshi (for comparison)	Available; sports contracts available

Date	Company	Event and source
2026-06-11	Kalshi	Idaho's Attorney General joined a multistate amicus brief, led by Nevada and Utah, supporting Ohio in Kalshi's Sixth Circuit appeal from the denial of a preliminary injunction (KalshiEX LLC v. Schuler, No. 26-3196). This was an amicus brief, not an enforcement action. Brief of Amici Curiae Nevada, Utah, 37 Other States, and the District of Columbia Supporting Defendants-Appellees, KalshiEX LLC v. Schuler, No. 26-3196 (6th Cir.), Doc. 57
2026-05-26	Kalshi	Idaho's Attorney General joined a multistate amicus brief, led by Nevada and Utah, supporting Tennessee's officials in their Sixth Circuit appeal from a preliminary injunction that bars Tennessee from enforcing its sports-wagering laws against Kalshi (KalshiEX LLC v. Orgel, No. 26-5235). This was an amicus brief, not an enforcement action. Brief of Amici Curiae Nevada, Utah, 39 Other States, the District of Columbia, and the Commonwealth of the Northern Mariana Islands Supporting Appellants, KalshiEX LLC v. Orgel, No. 26-5235 (6th Cir.), Doc. 42
2026-04-30	Kalshi	Idaho's Attorney General signed the comment letter of 41 attorneys general (lead signers Ohio, Nevada, New Jersey, New York, Tennessee and Utah) urging the CFTC to confirm it lacks jurisdiction over sports-related event contracts; the letter cites Kalshi's sports markets as an example. This was a comment letter, not an enforcement action. Comment letter of Ohio, Nevada, New Jersey, New York, Tennessee, Utah, 34 other States and the District of Columbia to the CFTC on prediction markets, Docket No. 2026-05105 (PDF via the New Jersey Attorney General)
2026-04-24	Kalshi	Idaho's Attorney General joined a multistate amicus brief, led by Nevada and Ohio, supporting Massachusetts in Kalshi's appeal to the Massachusetts Supreme Judicial Court from the state-court injunction against its sports event contracts (Commonwealth v. KalshiEX LLC, No. SJC-13906). This was an amicus brief, not an enforcement action. Brief of Amici Curiae of Nevada, Ohio, 35 Other States, and the District of Columbia Supporting Appellee, Commonwealth v. KalshiEX LLC, No. SJC-13906 (Mass.) (PDF hosted by the New York Attorney General)
2026-03-23	Kalshi	Attorney General Raúl Labrador announced that Idaho had joined a 39-state coalition brief (linked from the release) challenging the CFTC's position that federal law lets it override state gambling laws, noting that Kalshi and Crypto.com began offering sports betting labeled as event contracts in January 2025 and warning that states that ban sports betting could not enforce those bans under the CFTC's theory. The release announced no enforcement action. AG Labrador Defends Idaho's Authority to Regulate Sports Betting (Idaho Attorney General press release)
2026-01-30	Kalshi	Idaho's Attorney General joined a multistate amicus brief, led by New Jersey and Ohio, supporting Nevada's gaming regulators in Kalshi's Ninth Circuit appeal after the district court dissolved Kalshi's preliminary injunction (KalshiEX LLC v. Hendrick, No. 25-7516). This was an amicus brief, not an enforcement action. Brief of Amici Curiae of New Jersey, Ohio, 37 Other States, and the District of Columbia Supporting Appellees, KalshiEX LLC v. Hendrick, No. 25-7516 (9th Cir.), DktEntry 48.1 (PDF hosted by the New Jersey Attorney General)
2026-01-16	Kalshi	Idaho's Attorney General joined a multistate amicus brief, led by Massachusetts and California, supporting three California tribes' Ninth Circuit appeal seeking to stop Kalshi's sports event contracts on their lands under the Indian Gaming Regulatory Act (Blue Lake Rancheria v. Kalshi, Inc., No. 25-7504). This was an amicus brief, not an enforcement action. Brief of Massachusetts, California, 25 Other States, and the District of Columbia as Amici Curiae in Support of Appellants and Reversal, Blue Lake Rancheria v. Kalshi, Inc., No. 25-7504 (9th Cir.), DktEntry 38.1 (PDF hosted by the Nebraska Attorney General)
2025-12-22	Kalshi	Idaho's Attorney General joined a multistate amicus brief, led by Nevada and Ohio, supporting Maryland's regulators in Kalshi's Fourth Circuit appeal from the denial of a preliminary injunction (KalshiEX LLC v. Martin, No. 25-1892). This was an amicus brief, not an enforcement action. Brief of Amici Curiae of Nevada, Ohio, 36 Other States, and the District of Columbia Supporting Appellees, KalshiEX LLC v. Martin, No. 25-1892 (4th Cir.), Doc. 41
2025-06-17	Kalshi	Idaho's Attorney General joined a multistate amicus brief, led by Nevada and Ohio, supporting New Jersey's gaming regulators, who were appealing a preliminary injunction that barred New Jersey from enforcing its gaming laws against Kalshi's sports event contracts, in the Third Circuit (KalshiEX LLC v. Flaherty, No. 25-1922). This was an amicus brief, not an enforcement action. Brief of Amici Curiae of Nevada, Ohio, 32 Other States, District of Columbia, and Northern Mariana Islands Supporting Appellants, KalshiEX LLC v. Flaherty, No. 25-1922 (3d Cir.), Doc. 29

Good to know

The federal picture

Polymarket US operates as a CFTC-designated contract market after Polymarket bought the CFTC-licensed exchange QCEX; Kalshi has been a designated contract market since 2020. Whether states may still apply their gambling laws to sports event contracts is being decided in the courts:

How sure is this page? Confidence: medium. Availability rests on news roundups (CBS Sports and Covers, 2026-09-24; FOX Sports, 2026-08-06) that agree, and the Attorney General's own releases show opposition in federal litigation but no state enforcement. Researched September 25, 2026; court cases in several states can change the status at any time.

Other states

Frequently asked questions

Is Polymarket legal in Idaho?

As of September 25, 2026: polymarket.com does not let US users open new positions, including in Idaho. Polymarket US, the CFTC-regulated app, is reported available in Idaho according to CBS Sports (September 24, 2026). 9 involving Kalshi are listed below with their sources. This is a dated summary of public sources, not legal advice.

Can I use polymarket.com from Idaho?

Not for new trades. Polymarket's help center lists the United States as a blocked country and its developer documentation lists it as close-only (existing positions can be closed, new ones cannot be opened); US residents are pointed to Polymarket US.

Is Kalshi available in Idaho?

Available; sports contracts available, according to the sources on this page as of September 25, 2026.

Polymarket View is independent and not affiliated with Polymarket or Kalshi. This page summarises public sources; it is not legal advice. Polymarket odds today