Kalshi is available in most of California. A California resident can open an account and trade its event contracts, and no court order bars Kalshi anywhere in the state. But the legal position is not settled, and it has moved a long way in the past two months. On 16 September 2026 the federal appeals court that covers California ruled that two California tribes are likely to win their claim that Kalshi's sports contracts, traded from tribal land, are unlicensed gambling. Since then Kalshi says it has blocked sports contracts on those tribes' lands.
So the answer depends on where you are standing and what you are trading. This piece sets out what the courts have decided, what they have not, and where things stand on 21 October 2026.
Deposit $20, get $50 to trade
Welcome bonus on the world's largest prediction market.
18+ · New users only · Availability and terms vary by region · Trading involves risk of loss · BeGambleAware.org
The short answer
Kalshi is a Designated Contract Market regulated by the Commodity Futures Trading Commission. Its position is that event contracts on a federally regulated exchange sit under federal law, not state gambling law. Off tribal land in California, Kalshi is still offering its full range of contracts, including sports. On the lands of the tribes suing it, Kalshi says it now geofences its sports contracts.
California has not brought an enforcement action of its own. There is no cease-and-desist, no lawsuit from the Attorney General and no action from the California Gambling Control Commission. That does not mean the state accepts Kalshi's position. California's Attorney General co-signed a brief from Massachusetts, California, 25 other states and the District of Columbia supporting the tribes in the Ninth Circuit. The brief argues that sports wagering is illegal anywhere in California, under the state constitution (article IV, section 19(e)) and Penal Code section 337a.
What the Ninth Circuit decided
The case is Blue Lake Rancheria v. Kalshi, No. 25-7504. Two federally recognised tribes, Blue Lake Rancheria and Chicken Ranch Rancheria of Me-Wuk Indians, sued Kalshi and Robinhood under the Indian Gaming Regulatory Act (IGRA). The district court in San Francisco refused them a preliminary injunction. A unanimous Ninth Circuit panel, in an opinion by Judge McKeown, reversed that refusal on the IGRA claim on 16 September 2026.
The court held that the tribes are likely to succeed on four points:
- The contracts are class III gaming. Kalshi's sports event contracts fall within IGRA's class III category, which covers sports betting. Quoting its own Nevada ruling, the court said "[t]he substance of the sports event contracts offered on Kalshi's DCM is sports gambling, regardless of whether Kalshi calls them swaps."
- They take place on tribal land. A contract is "located on Indian lands" when the user enters into it from tribal territory, wherever Kalshi's exchange sits.
- They break the tribes' gaming rules. The tribes had not authorised the contracts, so offering them breached the tribes' gaming procedures and, through those, their compact with California.
- Federal commodity law does not override IGRA. The Commodity Exchange Act's grant of "exclusive" jurisdiction to the CFTC does not reach Kalshi's sports contracts, and a separate federal statute, the Unlawful Internet Gambling Enforcement Act, does not displace IGRA either.
The court upheld one part of the lower court's ruling. Kalshi's advertising about whether sports betting on its platform is legal was an opinion about an unsettled legal question, not a statement of fact, so it could not support the tribes' false-advertising claim under the Lanham Act.
What it did not decide
The Ninth Circuit did not order Kalshi to stop anything. It sent the case back to the district court, Judge Jacqueline Scott Corley in the Northern District of California, to weigh the other tests for a preliminary injunction: irreparable harm, the balance of hardships and the public interest. No injunction has been issued.
The ruling is about IGRA and tribal land. It does not decide whether California's own gambling laws apply to Kalshi elsewhere in the state, and California is not a party to the case.
What it means on tribal land
Since about 23 September, Kalshi says it has used a third-party geolocation provider, GeoComply, to stop people on the plaintiff tribes' lands from trading its sports contracts. It made that point in a joint status report filed on 14 October, arguing that the tribes' injunction request is now moot. The tribes dispute that the geofence works. They told the court a member of the Blue Lake Rancheria Gaming Commission placed a trade from the reservation, which they now date to 2 October, and they want a court-ordered way to check.
The geofence covers the plaintiff tribes' lands and sports contracts only. A third tribe, Buena Vista Rancheria of Me-Wuk Indians, is being added as a plaintiff, and Kalshi does not oppose that. Other California tribes are not parties.
What it means off tribal land
Elsewhere in California, Kalshi's sports contracts are still available, because no court has ordered otherwise and the state has not acted. The legal ground under that has shifted, though.
Nineteen days before the tribal ruling, the same court decided KalshiEX v. Assad, No. 25-7516, Kalshi's challenge to Nevada's gaming regulators. On 28 August 2026 it held that Kalshi's sports event contracts are likely not swaps under the Commodity Exchange Act, so Kalshi was unlikely to show that federal law preempts Nevada's gaming law. Kalshi has asked the full Ninth Circuit to rehear that case, and the petition is pending. The tribal ruling relied on that holding. Assad is a Nevada case, but Ninth Circuit rulings bind the federal courts across the circuit, which includes California. If California did move against Kalshi's sports contracts, Kalshi's main federal defence would start from a weaker position here than in states covered by the Third Circuit, which held in April 2026 (KalshiEX v. Flaherty) that federal law does preempt New Jersey's gaming law.
The disagreement between the circuits is now before the Supreme Court. New Jersey has asked it to review the Third Circuit's ruling (Flaherty v. KalshiEX, No. 26-299). The Court has not decided whether to take the case, and Kalshi's response is due on 9 November 2026.
Current status, 21 October 2026
- Statewide: Kalshi operates in California. No court order and no state action restricts it.
- On the plaintiff tribes' lands: Kalshi says sports contracts are geofenced. The tribes dispute that it works.
- In the district court: both sides now agree the case should no longer be stayed. Kalshi has proposed filing a further opposition to the injunction by 23 October, and a status conference is set for 21 October.
- At the Supreme Court: New Jersey's petition on the wider preemption question is pending.
How California compares with other states
Some states have gone further:
- Nevada: a state court preliminary injunction of 18 May 2026 bars Kalshi's sports, election and entertainment contracts. Under a stipulation with the Gaming Control Board, Kalshi had to geofence the state by 12 August.
- Michigan: an Ingham County Circuit Court preliminary injunction signed on 1 September 2026 requires Kalshi to keep Michigan users out of its sports contracts.
- Washington: a King County Superior Court preliminary injunction bars a broad set of Kalshi contracts, from sports and elections to culture and science markets.
- Massachusetts: a Superior Court granted an injunction against Kalshi's sports contracts in February 2026, but it is stayed while the Supreme Judicial Court decides the appeal, which was argued in May.
- Ohio and Tennessee: on 25 September 2026 the Sixth Circuit held that Kalshi is unlikely to show federal law preempts those states' gambling laws. Kalshi has asked the full court to rehear the case.
Kalshi uses geolocation, so what you can trade depends on where you are, not where you live. Travelling from California into Nevada, Michigan or Washington changes which markets load.
What could change this
Several things could move the California picture:
- The district court could grant the tribes an injunction, or order a way to verify the geofence.
- More California tribes could sue.
- California's Attorney General or gaming regulators could act directly.
- The Supreme Court could take up the preemption question.
Sports contracts are the most exposed category in every one of those scenarios. Anyone relying on this piece later should check what loads from their location and whether the California courts or regulators have moved.
iPredicta tracks the state picture
iPredicta is a UK-based prediction markets discovery platform. We cover Kalshi, Polymarket and the other major venues, and we keep a dated record of where each platform is restricted in the US, from court orders and regulator documents. For the national view, see our overview of prediction market legality across the US; for the federal argument in more depth, see why CFTC regulation shapes state-level access. The sister piece on Polymarket access in California covers the other venue.
The law as it stood on 21 October 2026. This article is not legal advice.
Frequently asked questions
Is Kalshi legal in California?
Kalshi operates in California as a CFTC-regulated exchange, and no court order or state action bars it statewide. Its sports contracts are contested. On 16 September 2026 the Ninth Circuit held that two California tribes are likely to succeed in showing that Kalshi's sports contracts, traded from their tribal lands, are unlawful gaming under federal tribal gaming law. The case is back in the district court and no injunction has been issued.
Can I use Kalshi in California?
Yes, in most of California. A resident who is 18 or older and can verify their identity can open an account and trade, including sports contracts. On the lands of the tribes suing Kalshi, Kalshi says sports contracts are now blocked by geofence.
Does the Ninth Circuit ruling ban Kalshi in California?
No. It found the tribes likely to win on their tribal-land claim and sent the case back to decide whether to grant an injunction. It covers tribal land, not the rest of the state. But it rests on an earlier Ninth Circuit ruling, in Kalshi's Nevada case, that federal commodity law likely does not protect Kalshi's sports contracts from state gaming law. That earlier ruling binds federal courts in California too.
Has California taken action against Kalshi?
Not directly. California has sent no cease-and-desist and brought no suit. Its Attorney General has backed the tribes and other states in court. He co-signed an amicus brief from 27 states and the District of Columbia in the tribes' Ninth Circuit appeal arguing that sports wagering is illegal anywhere in California.
Could California block Kalshi in future?
Yes. Any of these could narrow access, most likely for sports contracts first:
- an injunction in the tribal case;
- further tribal suits;
- action by the Attorney General or the state's gaming regulators;
- a Supreme Court ruling on preemption.
Check what Kalshi offers from your location before relying on this article.