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.
Amanda S. on Weir Canyon Trail
Easy trail. Take the "old" trail split if you want one quick challenging steep climb. Otherwise, stick to the left to keep it easy. It is especially beautiful after all the rains with its tall green grasses and wildflowers. A few impressive lookout spots/views as well. I also enjoy that it's a loop, so you don't have to backtrack the way you already came.
I can't imagine this trail being as enjoyable in the hotter months though, when most of the vegetation will be brown and the trail dusty. Hence only four stars.
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.