In the sports gambling industry, there’s one sport that stands above the rest: football. Sportsbook managers measure their careers in NFL seasons.

In Colorado, $297 million was wagered between September and October, just on NFL games, according to numbers from the Department of Revenue.

October was the most active month yet in Colorado’s fledgling sports betting market, with $491 million wagered on everything from football to basketball to baseball. Even table tennis remains strong. Betters won back $463 million in October, leaving the house with about $29 million in gross revenue.

The numbers were surprising to state regulators, who didn’t expect sports gambling to be this big, this fast.