Not off the top of my head. I grew up in Hartford and West Hartford. There is Falcon BMX in Meriden but that's really central CT. I believe Trumbull may still have a BMX track. The best advice is maybe go through a phone book and call local shops and ask if they know of any spots. Some towns like new britain, Newington and Manchester have town build skate parks which usually let bikes in and there are more younger kids than not.