I race at NorCal on a regular basis. Delta RC in Antioch is the next closest track. It is about 70 miles away. I haven't been to Delta since they opened the outdoor track this year. This is the info thread for Delta:
http://www.rcracing.com/msgthread.cf...368&InfoID=282
NorCal's track is really nice, but the surface is a little loose and dusty right now. This is the info thread for NorCal:
http://www.rcracing.com/msgthread.cf...Messages=10434
NorCal does not run Nitro on a regular basis. They will let you run with the ebuggy class though if there aren't enough nitro cars for a class.