Where can I watch horse racing for free online in USA?

The only way to watch horse racing online truly for free in the U.S. is on a video service like YouTube. And then you’ll only be able to watch races after they have been run and only be able to watch select races that other fans post. Many of the videos are low quality as well, shot on cellphones off track feeds or TV.

Watch live racing on streaming services

You can, however, watch live racing on streaming services by numerous advance deposit wagering (ADW) providers, but you’ll need to open an account. Check the small print, though, to make sure there’s no minimum action required to avoid a charge for the service.

Equibase.com, U.S. horse racing’s official data provider, also makes some high-profile races available after they are run and offers reasonably priced subscriptions to video replays ($12.95 a month as of early 2019).
One other option you can explore: If you have a TV package with a cable or satellite provider, they may offer the ability to stream televised content online. Horse racing ccounts wagering: AmWager, Hollywood Races, Interbets Off-Track Betting, NYRA Bets, Premier Turf Club (BetPTC), TVG, TwinSpires, Xpressbet.

Since most carry TVG, the horse racing network, you could be able to watch races online at no additional charge beyond your monthly bill.