Delaware Sports Betting Is sports betting legal in Delaware? Yes. Can I bet on sports right now in Delaware? Yes, at the physical sportsbooks in the state. Can I bet online legally in DE? Not at this time. Delaware officially initiated legalized sports betting on June 5 when the state’s three casinos — Dover Downs Casino, Delaware Park Casino and Harrington Raceway and Casino — began accepting wagers. Delaware was able to launch single-game betting without any new legislation, as it’s one of four other states besides Nevada that had a form of grandfather exemption from PASPA when it was first passed in 1992.