In 2008, the 210 acre Weir Canyon Wilderness Park was incorporated into Santiago Oaks. The annexation created a trail system that spans from Irvine Regional Park through Santiago Oaks to Weir Canyon in East Anaheim Hills.
Great hike! Mine was a fast pace hike with a couple stops for water breaks and to just enjoy the view. My hike was with OC Parks so it was a group and we got to go a different route than most people. We started at the Outdoor Education Center, took the IROEC Trail to a gate that opened to the Weir canyon trail. This is normally locked but OC Parks opened it. Here we entered the Weir canyon trail going a couple miles before cutting back onto the Roadrunner Loop. Total miles was 3.8 miles. Took about an hour and a half. Lots of inclines so not the easiest hike but I felt it was the perfect amount and the trail ends rather flat giving you a nice cool down period. 610ft elevation gain.