The Orange County Marathon is an annual 26.2-mile (42.2 km) marathon that takes place in Orange County, California. The first marathon was held in 1979, and it has been held every year since then. The marathon is typically held in late October or early November.
The Orange County Marathon is one of the largest marathons in the United States, with over 20,000 participants in 2019. The marathon is also a Boston Marathon qualifier, meaning that runners who finish the Orange County Marathon with a qualifying time can automatically qualify for the Boston Marathon.