This trail is divided into three parts. First, the trail starts at an intersection with Park Ridge Trail
. It climbs along the side of a hill among scrub brush and is unshaded. The trail is well-built singletrack, well graded, and rut-free. After 0.4 miles, the trail intersects with a small loop. To stay on Crespi Trail, stay right. A short while later, stay right at the second junction with Crespi Loop and reach the top of the climb at 0.7 mi.
Second, after the high point of the trail, it descends for 0.3 miles. This section has more obstacles and passes through an oak grove for most of the descent. This is a really fun section of trail.
Third, the last 0.5 miles of trail connects the oak grove with Chumash Trail. The trail narrows as it opens up into grasslands. This section is overgrown and rutted. Not very fun to run.
The best use of this trail is either as a lollipop; starting at Park Ridge Trail
, running around Crespi Loop, and returning to Park Ridge Trail
Parking is at the northerly trailhead on S Bay Blvd.