I just did a quick check, and it not looking to good dirt oval any more.
Your best bet is IMI 1/4 dirt track http://www.thecoloradokarter.com/phpBB2/cotracks.php call them up and they will tell you.
Valley Dirt Riders use to… but I don’t see karts on their site any more http://allforoneracing.com
Same deal with I76 speedway
Here’s some info on the Burlington track http://www.racefan.com/showtrack.asp?id=1630
Good Luck