The start line is on La Palma Ave. at the west end of Yorba Regional Park (YRP) just west of the softball fields.  Course travels east along YRP on La Palma Ave for approximately 1.3 mi., and then turns right onto the paved access road at the end of YRP.  The course then turns left onto the gravel road and continues east for about one-quarter mile until it intersects with the Santa Ana River Trail, which is the course turnaround at the halfway point.  The course then doubles back on the Santa Ana River Trail and continues west for the remaining approximate 1.5-mile distance to the finish line at the west end of YRP.

The start line is on La Palma Ave. at the west end of Yorba Regional Park (YRP) just west of the softball fields.  The course travels east along YRP for approximately 1.3 mi., and then turns right onto the paved access road at the end of YRP.  

The course then turns left onto the gravel road and continues east for about 1.75 miles along the Santa Ana River Trail, until the turnaround at the halfway point.  The course then doubles back on the Santa Ana River Trail and continues west for the remaining approximate 3.1-mile distance to the finish line at the west end of YRP. Less than a quarter of a mile from the finish, the course moves down from the river trail onto the YRP trail to the finish at the west end of YRP.