Trabuco Creek Road can be a dangerous ride. You will be sharing the road with pickups and motorcycles, many of whom are out there to party and have a good time in the dirt. Keep your eyes and ears on the road.
The Holy Jim singletrack is some of the best OC has to offer. Watch for hikers, especially on weekends.
I would suggest parking at the Albertsons or CVS in Rancho Santa Margarita where Santa Margarita Parkway hits Plano Trabuco and just riding from there. Some people park at the lot on Trabuco Creek Road.
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03/25/18 Haven't ridden back in here in a long time. Felt better than I thought would. National Forest gate was closed so the hikers had to park there which definitely helped keep their numbers down.
Saw a few familiar faces out there as well. Took a little detour on the way down to check out the falls. Rode with Greg, Mark & Troy.