# Is Kalshi Legal in California? Kalshi, Polymarket and Tribal Land California has no legal sports betting, yet Kalshi and Polymarket US take Californians' sports contracts. The Ninth Circuit's 16 September 2026 ruling covers tribal land only. What each venue does in California, and what the state has done. Canonical URL: https://vultax.com/research/prediction-market-legality/united-states/california Author: [Vultax Research Team](https://vultax.com/editorial-policy#who) Published: 2026-10-30 Last public revision: 2026-10-30 AI-assisted drafting, research and editing. Published by OmniOS OÜ. [How we use AI](https://vultax.com/editorial-policy#ai) Published research snapshots and calculations; these exports do not contain current quotes or live account data. Observation windows and populations are stated in the source captions and methodology. Missing metadata is unknown, not zero. Describes court decisions, regulatory measures and venue documents as read on 30 October 2026. The Ninth Circuit ruled on a preliminary-injunction appeal about tribal land; it is not a final judgment and does not cover the whole state. Nothing here is legal or financial advice. ## Key figures - California orders against Kalshi or Polymarket: None found — No state court order or regulator order naming either venue, in the Vultax case record checked 30 October 2026; this is not a finding that their contracts are lawful - Ninth Circuit ruling on tribal land: 16 Sep 2026 — Blue Lake Rancheria v. Kalshi, No. 25-7504: two tribes likely to win under the Indian Gaming Regulatory Act; it covers contracts entered from their land, not the whole state - District-court order after the ruling: 21 Oct 2026 — Tells the parties to discuss a geofencing stipulation and adds a third tribe; the injunction itself is still undecided ## The short answer Sports betting is illegal in California. The Ninth Circuit opened its 16 September 2026 opinion by saying so: "In California, where sports betting is illegal, you can't place your bet." Kalshi and Polymarket US nonetheless offer sports event contracts to Californians, on the argument that a contract listed on a CFTC-registered exchange is a swap governed by federal law, not a bet. No California court or regulator has ordered either venue to stop. The one California ruling so far is narrower than it is often described: two tribes are likely to win their claim that Kalshi's sports contracts break federal Indian gaming law when they are entered from tribal land. It does not cover the rest of the state. The international site, polymarket.com, is a different product. It does not accept new trades from anywhere in the United States, California included, under Polymarket's own documentation. ## Kalshi, Polymarket US and polymarket.com in California Read 30 October 2026. A row says what a court or a venue's own document states; it is not a finding that any trade is lawful. | Product | What applies in California | Source and date | | --- | --- | --- | | Kalshi event contracts | No statewide order; on two tribes' land the Ninth Circuit found the tribes likely to win, and sent the injunction decision back to the district court | Ninth Circuit opinion, 16 September 2026 | | Polymarket US (QCX exchange) | No California order or suit naming it found; its app terms require users to meet local age and eligibility rules and name no state | Polymarket US app terms effective 23 October 2026; Vultax case record checked 30 October 2026 | | polymarket.com (international) | Close-only for the whole United States in the developer documentation; the help page lists the US as completely restricted | Polymarket documentation and help page, read 30 October 2026 | [CSV](https://vultax.com/research/prediction-market-legality/united-states/california/data.csv?dataset=venues-table), [JSON](https://vultax.com/research/prediction-market-legality/united-states/california/data.json?dataset=venues-table) ## The tribal-land ruling Blue Lake Rancheria and Chicken Ranch Rancheria of Me-Wuk Indians sued Kalshi and Robinhood, which distributes Kalshi's contracts, in the Northern District of California in July 2025 (No. 3:25-cv-06162). A third tribe, Picayune Rancheria of the Chukchansi Indians, left the appeal by agreement after oral argument. The district court refused a preliminary injunction. On 16 September 2026 a Ninth Circuit panel of Chief Judge Murguia and Judges McKeown and Paez reversed in part (No. 25-7504). It held that the tribes are likely to show that Kalshi's sports contracts are class III gaming, that a contract entered by a user on tribal land is gaming located on Indian lands, and that Kalshi offers it in breach of the tribes' gaming procedures. It upheld the refusal to stop Kalshi's "Sports Betting [Is] Legal in all 50 States" advertising, and sent the case back for the district court to weigh the remaining injunction factors. The Ninth Circuit's mandate issued on 8 October, according to the parties' joint report of 14 October. On 21 October Judge Jacqueline Scott Corley neither granted nor refused the injunction: she told the parties to discuss a stipulation on geofencing that would stay in place until the court orders otherwise, added Buena Vista Rancheria as a plaintiff, and set 4 November for an amended complaint and a case conference. In the joint report Kalshi says it began geofencing the tribes' lands with GeoComply on 23 September. The tribes dispute that and allege that a trade was placed on a reservation on 2 October. Both are the parties' positions, not findings by the court, and no court-ordered geofence was in place when the 21 October order was made. ## What California has done The state has taken sides in other states' cases without suing anyone itself. On 12 June 2026 Attorney General Rob Bonta joined 36 other attorneys general in a brief backing Ohio against Kalshi in the Sixth Circuit, which ruled for Ohio and Tennessee on 25 September. On 7 October he signed the states' brief asking the Supreme Court to hear New Jersey's case, and on 29 October he joined another 37-state brief, backing Utah against Kalshi in the Tenth Circuit. His office called that California's ninth multistate filing against Kalshi and similar companies. The Legislature has not passed a prediction-market law. Bills on officials trading prediction-market contracts on nonpublic information (AB 1840) and on the Attorney General's power to investigate prediction-market wagering (AB 2446) were last acted on in committee in the spring, according to bill trackers; the Legislature's own site could not be read for this check. On 27 March 2026 Governor Gavin Newsom signed an executive order barring his appointees from using nonpublic state information to profit on prediction markets. ## The federal questions still open California is in the Ninth Circuit, which ruled for Nevada against Kalshi on 28 August 2026; the Third Circuit ruled the other way for New Jersey in April. Three petitions ask the Supreme Court to settle whether federal law displaces state gambling law for these contracts. Responses are due on 13 and 16 November 2026 in two of them; in the third, New Jersey's (No. 26-299), the response is due on 9 November, and Kalshi asked on 29 October, unopposed, to move it to 7 December. On 19 October the CFTC put into force an interim rule keeping casino-style gambling products offered under a state or tribal gambling authorisation outside the definition of a swap, and separately proposed adding specified event contracts to that definition. The proposal's comment period closes on 18 November; neither measure settles the tribal case or a state's gambling law. The [US guide](https://vultax.com/research/prediction-market-legality/united-states) follows the national picture. ## What this means if you are in California - Kalshi and Polymarket US - They operate in California under their federal registration, and no state order stops them. That is a description of the current position, not a ruling that their sports contracts are lawful under California law. - On tribal land - The Ninth Circuit's reasoning turns on where the user is when the contract is entered. It applies to the land of the tribes in the case, and the injunction itself is for the district court to decide. - polymarket.com - It does not take new trades from the United States, and Polymarket's help page says using a VPN to get around that breaks its terms. - Age and identity - Polymarket US's terms require users to be 18 or older, or older where local law sets a higher age, and to pass identity checks. ## Method and limits The Ninth Circuit opinion, the district court's 21 October order and 14 October joint report, the Attorney General's releases, the Supreme Court dockets, the CFTC's rules and the venue documents were read on 30 October 2026. District-court filings after 21 October were not available. Vultax did not test access from California or from tribal land. This page describes legal documents; it is not legal advice. Challenge a line at research@vultax.com. ## Questions ### Is Kalshi legal in California? Kalshi is a CFTC-registered exchange and takes California customers, and no California court or regulator has ordered it to stop. Sports betting is illegal in California, though, and on 16 September 2026 the Ninth Circuit held that two tribes are likely to win their claim against Kalshi's sports contracts entered from their land. ### Is Polymarket legal in California? polymarket.com does not take new trades from anywhere in the United States. Polymarket US, the CFTC-registered app, is not named in any California order or suit Vultax found; that is not a ruling that its sports contracts are lawful in California. ### Did the Ninth Circuit ban Kalshi in California? No. It held that two tribes are likely to win under the Indian Gaming Regulatory Act for contracts entered from tribal land, and sent the injunction decision back to the district court. It did not rule on the rest of the state. ### Is sports betting legal in California? No. California has not legalised sports betting, which is why the tribes and other states argue that sports event contracts are bets by another name. ## Sources and methodology - [U.S. Court of Appeals, Ninth Circuit: Blue Lake Rancheria v. Kalshi, No. 25-7504, opinion (16 Sep 2026)](https://cdn.ca9.uscourts.gov/datastore/opinions/2026/09/16/25-7504.pdf) — Tribes likely to succeed under IGRA for sports contracts entered from tribal land; injunction factors sent back to the district court - [U.S. District Court, N.D. Cal.: order of 21 Oct 2026 in Blue Lake Rancheria v. Kalshi, No. 3:25-cv-06162-JSC (ECF 103)](https://storage.courtlistener.com/recap/gov.uscourts.cand.453216/gov.uscourts.cand.453216.103.0.pdf) — Directs the parties to discuss a geofencing stipulation and adds Buena Vista Rancheria as a plaintiff; neither grants nor denies the injunction - [Joint status report of 14 Oct 2026 in Blue Lake Rancheria v. Kalshi (ECF 101)](https://storage.courtlistener.com/recap/gov.uscourts.cand.453216/gov.uscourts.cand.453216.101.0.pdf) — Records the Ninth Circuit mandate of 8 October; the parties' positions on geofencing, not court findings - [California Attorney General: Bonta joins bipartisan coalition defending state gambling laws against Kalshi (12 Jun 2026)](https://www.oag.ca.gov/news/press-releases/attorney-general-bonta-joins-bipartisan-coalition-defending-state-gambling-laws) — 37 attorneys general backing Ohio in the Sixth Circuit; California's seventh multistate brief on prediction markets - [California Attorney General: Bonta defends state gambling laws against Kalshi (29 Oct 2026)](https://oag.ca.gov/news/press-releases/attorney-general-bonta-defends-state-gambling-laws-against-kalshi) — 37 attorneys general backing Utah in KalshiEX v. Cox in the Tenth Circuit; an amicus brief, not a California enforcement action - [Polymarket US: app terms of service, effective 23 Oct 2026](https://polymarket.us/tos) — QC Tech's app, separate from the QCX exchange and QC Clearing; section 3 sets age, eligibility and identity checks - [Apple App Store: Polymarket US app listing (read 30 Oct 2026)](https://apps.apple.com/us/app/polymarket-trade-live-sports/id6648798962) — Says "in all 50 states*" with the footnote "Trading currently unavailable in NV"; the Google Play listing has no Nevada note - [Polymarket documentation: geographic restrictions (read 30 Oct 2026)](https://docs.polymarket.com/api-reference/geoblock) — Blocked, close-only and website-only close-only lists for polymarket.com; does not cover Polymarket US - [Polymarket Help Center: geographic restrictions (read 30 Oct 2026)](https://help.polymarket.com/en/articles/13364163-geographic-restrictions) — Updated 29 Oct 2026; headed 40 countries completely restricted but listing 41 codes, and differs from the developer documentation - [CFTC: interim final rule excluding casino-style gambling, 91 FR 65969 (19 Oct 2026)](https://www.govinfo.gov/content/pkg/FR-2026-10-19/html/2026-21376.htm) — RIN 3038-AF81; in effect from 19 October 2026 (release 9309-26); comments close 18 November - [CFTC: proposed rule on event contracts, 91 FR 66022 (Federal Register, 19 Oct 2026)](https://www.govinfo.gov/content/pkg/FR-2026-10-19/pdf/2026-21377.pdf) — RIN 3038-AF82; announced 9 October (release 9310-26); a proposal, comments close 18 November 2026 - [Supreme Court docket 26-299, Flaherty v. KalshiEX (read 30 Oct 2026)](https://www.supremecourt.gov/docket/docketfiles/html/public/26-299.html) — Response due 9 November 2026; on 29 October Kalshi asked, unopposed, to move it to 7 December - [Supreme Court docket 26-338, Robinhood Derivatives v. Dreitzer (read 30 Oct 2026)](https://www.supremecourt.gov/docket/docketfiles/html/public/26-338.html) — Response due 13 November 2026 - [Supreme Court docket 26-344, North American Derivatives Exchange (Crypto.com) v. Nevada (read 30 Oct 2026)](https://www.supremecourt.gov/docket/docketfiles/html/public/26-344.html) — Response due 16 November 2026 - [Kalshi's request to extend the time to respond in No. 26-299 (letter of 29 Oct 2026)](https://www.supremecourt.gov/DocketPDF/26/26-299/431233/20261029183513514_2026-10-29%20Flaherty%20v%20KalshiEX%20LLC%20Extension%20Request.pdf) — Asks to move the brief in opposition from 9 November to 7 December 2026; not yet granted when read on 30 October - [Vultax: Prediction market lawsuit tracker](https://vultax.com/research/prediction-market-lawsuit-tracker) — Every case Vultax follows, each checked against the court record