This trail is only open on Irvine Ranch Natural Landmark's Wilderness Access Days. Cyclists, hikers and equestrians have to sign up prior to Open Access Days, held about once every 3 months or so. There are only so many slots available to participate. This trail is not open on days not authorized by the Conservancy.
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Family Friendly: Barely noticeable elevation gain, wide trail, and scenic.
This trail isn't about a technical ride or elevation gain/descent, it's about canyon scenery. The trail does gain about 500 ft of elevation but you hardly notice it. The trail follows noisy Santiago Canyon Road for a little bit, but after you are behind the ridge, it's dead quiet.
The fire road is in good condition, with a couple soft sandy spots but no big deal. It's half shade, half sun. Limestone Canyon Road traverses a few meadows and oak forests, and at the end the rider is rewarded with a stunning view of the Sinks, OC's mini-grand canyon. Good for beginners.
Limestone Canyon Road continues beyond the Sinks but it was closed off the day I went to Wilderness Access Day.