All Cars, Park at the Iron Maintain parking, intersection of CA-67 and Poway Rd (32.978244, -116.972938).
A nice loop up Iron Mountain.
The trail is good, sometimes rocky.
Up to the top there are more switchbacks than necessary, with a gradual climb.
There are big signs, but on the return loop signs are rare.
Warning: Can be muddy after rain.
This is a very popular trail.