Underdog Sportsbook is fully licensed and goes live in Missouri on 1 December 2025, regulated by the Missouri Gaming Commission.
Underdog is partnered with the Kansas City Royals for its sportsbook license and has a marketing tie-in with the St. Louis Blues.
You must be 21+ and physically located in Missouri to use the sportsbook.
Have you been searching, “is Underdog legal in Missouri?” Well, it’s officially coming to Missouri, and it’s 100% legal. The Missouri Gaming Commission (MGC) signed off on Underdog as one of just nine approved mobile sportsbooks for launch day.
It’s licensed, it’s regulated, and it goes live at 12:01 a.m. on 1 December 2025. Right now, you can pre-register inside the app, deposit, and get set up before the full launch. Here’s how Underdog got licensed, what you can do with it in Missouri, and how it compares to the other sportsbooks hitting the market.
The word “legal” gets thrown around a lot, but here’s exactly what it means for Underdog.
Underdog Sportsbook has a temporary mobile sports wagering license from the Missouri Gaming Commission, which means Underdog will be available in Missouri. That license gives Underdog the green light to launch statewide on 1 December 2025, the official start of Missouri’s regulated online sports betting market.
Underdog Missouri secured market access through a partnership with the Kansas City Royals. This isn’t just a promo tie-in; it’s how they are legally qualified to launch. Missouri law allows pro sports teams to partner with operators, giving them mobile skin access in the state. They’ve also got a marketing deal with the St. Louis Blues, so you’re going to see Underdog branding on both sides of the state, not just Kansas City.
This is a pretty new sportsbook. Missouri will be just the second state where Underdog offers a full betting product, after launching earlier in North Carolina. If you’ve only used Underdog for fantasy, the sportsbook is a separate section in the app, with full market coverage, live odds, and real money bets.
It took a few years and a couple of failed bills, but Missouri finally crossed the finish line in November 2024, when voters approved Amendment 2. That amendment legalized online and retail sports betting like Draftkings in Missouri, and gave regulatory authority to the Missouri Gaming Commission. Since then, the MGC has built out the rules and handed out licenses to the first batch of operators.
Here’s how it works on paper:
Once it goes live on 1 December, you can use Underdog in Missouri, and it will offer a full betting menu, even if it’s still building out its state footprint compared to the big guys. Here’s what we’ve seen based on their North Carolina launch, and what we expect to mirror in Missouri.
Underdog covers all the core markets you’d expect:
Instead of loading you up with endless menus and obscure bet types, the Underdog app keeps it tighter and easier to play with. Odds and picks are centered around the most relevant matchups, and the interface leans into a quick-pick format that helps you get your selections in fast. You’re not going to find niche international markets or deep oddsmaker menus here. But if you’re building plays around NFL games, NBA stars, or college football matchups, it feels like Underdog is set up with that in mind.
So, when will Underdog be legal in Missouri? Underdog Sportsbook is locked in for the Missouri sportsbooks betting launch on 1 December 2025, backed by the Kansas City Royals and regulated by the Missouri Gaming Commission. This isn’t a wait-and-see situation. It’s happening. You can pre-register today, and be ready to go the second the clock hits midnight on launch day.
It’s not the biggest book in the room, but it’s certainly one of the best, especially if you’re into building plays around stat lines and player performances. Sign up via the banner on this page to pre-register with Underdog Missouri.
