The Cross Country Running Series is is sponsored by the Pacific Association of USA Track and Field (PA/USATF) and consists of ten off-road races spread around Northern California. The races range in length from about 5K to 10K and have perhaps the most competive fields of any races in Northern California. This is a Grand Prix with point totals being kept over the race series for both individuals and teams. Every year Tamalpa Runners hosts the Johhny Lawson Challange which is one of the races in the series. This race is held at China Camp.