So, there are some discrepancies on the distance of this trail. The NPS map shows only the maintained sections which is marked .6 miles one way (out and back) but there is an extension...an unmaintained primitive trail which starts at the "steep trail" warning sign. I have no idea how far up it is to the top of the mountain but another site claims it's 4 miles (roundtrip) with a 900-1100 foot gain in elevation.
The first .6 miles is relatively easy-moderate but I'd rank the primitive trail as moderate to strenuous. Additionally, the trail gets a little tricky to follow, even with the cairns, and requires scrambling up some kinda steep rock. The trail seems to dissipate as well so be aware of your landmarks.
Views are fantastic BUT you cannot get to the arch. As a matter of fact, we were only able to find a tiny side trail that offered a very limited side view from about 200 yards away. We couldn't figure out any way to actually get to the arch. Still a challenging hike and the views are grand.
Greg W. on Ajo Mountain Drive
Very scenic and great hiking.
SUPER BEAUTIFUL! It is like being on another planet... coming from the midwest this was just such a striking, gorgeous route.... adore it and will definitely go back.
There are areas to do foot hiking, but I would start from a visitor center and take mapped routes. Bring water, watch out for snakes and scorpions!