Is Kalshi legal in Wisconsin? It’s contested. Wisconsin’s attorney general sued Kalshi and four other platforms in April 2026, and a federal judge refused the CFTC’s request to stop the state in July. Sports contracts were still available in late October 2026 while the cases continue. This guide sets out where things stand, as of October 28, 2026.
At a glance
| Platform | Wisconsin status (Oct 2026) |
|---|---|
| Kalshi, Polymarket, Robinhood, Coinbase, Crypto.com | Sued by the state in April 2026; sports trading still available as of October 27, 2026 |
| Novig | Suing the attorney general in federal court |
| Underdog | Suing the state in federal court |
| Sportsbooks | Only through tribes: almost all other sports betting is illegal |
What’s happened
- In April 2026 Attorney General Josh Kaul sued Kalshi, Robinhood, Coinbase, Polymarket and Crypto.com, asking for their apps to be declared public nuisances and permanently barred from offering sports event contracts in Wisconsin.
- The CFTC sued Wisconsin to stop it. On July 29, 2026 Judge William Griesbach of the Eastern District of Wisconsin denied the CFTC a preliminary injunction, finding it unlikely to show sports event contracts are swaps and that Wisconsin’s gambling laws “are not preempted” by federal commodities law. That’s a preliminary ruling, and the CFTC said it will appeal.
- In August 2026 Novig sued Kaul in federal court, asking for a declaration that federal law preempts the state’s gambling laws. Underdog has also sued Wisconsin.
- Gov. Tony Evers signed a bill in 2026 legalizing sports betting placed on computer servers on tribal land, backed by all 11 of the state’s recognized tribes.
Sources, checked October 28, 2026:
- WPR: Wisconsin DOJ sues prediction market companies (Apr 24, 2026)
- Covers: CFTC loses bid to block Wisconsin (Jul 29, 2026)
- WPR: Novig sues Josh Kaul (Aug 20, 2026)
- CDC Gaming: Underdog’s suits against seven states (Oct 16, 2026)
- CBS Sports: prediction market legal states (Oct 27, 2026)
Why it matters
Wisconsin tests whether a state can keep enforcing its gambling laws when the CFTC itself sues to stop it. The state is in the Seventh Circuit, where a CFTC appeal would go. The national picture is in Is Kalshi legal?
FAQ
Is Kalshi legal in Wisconsin?
Contested. The state is suing Kalshi, and a federal judge refused to stop it in July 2026, but sports trading was still available in late October. Check the Kalshi app for what’s available where you are.
Is Polymarket legal in Wisconsin?
Polymarket is among the companies Wisconsin sued in April 2026. Its main exchange isn’t open to US residents; check the Polymarket US app for what it offers in Wisconsin.
Related: Is Kalshi legal? · Minnesota · All legal guides