The Finger Rock Canyon trail to Mt. Kimball, one of the highest in the Santa Catalina Mountains, treks through gorgeous Sonoran landscape, meandering through wash and canyon lowlands, close to saguaros, gaining 400' in the first mile.  That easy grade ends abruptly at mile two, when you encounter the first of many rock steps on a steep trail that climbs an average of 950' per mile to the summit.  The south summit slope bestows a birds-eye view of Tucson, the north side a perched outcrop view of canyons below your feet and the rugged peaks of the western Santa Catalinas.
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Fred and I have been hiking this mountain ever since we started visiting Tucson to get out of Idaho high country's somber and snowy springs.  This established Class 1 trail was a welcome change from the past few months of non-trail, route-finding, scrambling  ascents in Utah and Nevada.  Great to not have to navigate or continuously hunt for a route or the trail, but instead let the trail take us to the top.  On this trip, we first stopped near Kingman, Arizona to attempt Mt. Tipton, but the unmarked 3,500' gain entailed miles and of shrubby terrain clogged with scrub oak and junipers, so we turned around.  

Islands in the Sky
The ability to see the changing scenery of multiple life zones is one of the great features of southern Arizona hiking.  The rewards are saguaros and yuccas at the beginning and end, and pine and juniper at the top of your hike, if you are willing to make the thousands-of-feet elevation journey.  The Santa Catalina Mountains are but one of the many "sky islands"  that rise above the desert. From the Chiricahua mountains in southeastern Arizona to the Sierra San Luis Mountains in Mexico's  Chihuahua mountains,  these unique, rugged environments support some of the highest levels of biodiversity in the world.  Below is a summary of what I learned about biomes and sky islands.  I also wrote about this in my Tanque Verde Peak - Saguaro Wilderness post.

Southern Arizona mountains are a hiker's paradise.  With waterfalls, rugged gneiss and granite rock outcrops to climb over, and wildflowers in spring that represent all of the color spectrum, this desert is surprisingly lush.  It is a spectacular land where all elements work together in harmony through monsoons, rains, and killer heat waves, and cool winters.  On Mt. Kimball's descent, the other side of the canyon is strewn with hundreds of saguaros clinging to rocky ledges, illuminated by the setting sun.  This sight makes you forget about your tired legs.

References
Bezy, J. V.  2016. A Guide to the Geology of the Santa Catalina Mountains, Arizona:  The Geology and Life Zones of a Madrean Sky Island.  Arizona Geological Survey.

Mt. Kimball.  Summit Post website.

Dimmitt, et al.  2015.  A Natural History of the Sonoran Desert.  Arizona-Sonora Desert Museum Press and University of California Press.
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The Sky Islands.  From website:  Sky Island Alliance.

The First Inhabitants.  From Mt. Lemmon General Store and Gift Shop website.

Moapa Peak, included on the Sierra Club Desert Peaks Section list is a distinguished, stand-alone hulk of narrow limestone noticeable on the north side of  I-15 north of Las Vegas.  It's a classic desert peak, well-fortified by a series of almost vertical ramparts at its base.  It's one of the more memorable and exposed hikes I've done.   Trip reports reveal hikers who have summited, as well as those who reportedly turned around when they saw the final exposed "knife-edge" ridge to gain the last 160'.  After skirting around the south cliff face, the route wraps briefly to the north at a saddle, where the Class 3 climbing up the final ridge begins.  Although the narrow ridge proved too daunting for Fred and I, the hike was worthwhile because the steep drop-offs give the slight feeling that a few missteps may plunge you into the chasms and canyons below.  We found the "trail" mostly stable and easy to follow.  The views of the ribs of dark and sharp mountain ranges rising from flat and buff-colored desert washes are spectacular.
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Occasional fossils appear in this Paleozoic limestone (see photos below).   I'm not sure what they are, so if someone knows, please contact me!  One of them looks like fish, another looks like petrified wood.

Harder than Mt. Katahdin's knife edge?
​Maine's Mt. Katahdin, it's highest, has a famous "knife's edge" traverse to the summit.  Fred and I summited Katahdin when we lived in New England and felt it wasn't too scary.  Reports say that it narrows to four feet of width in a few places.  I think Moapa Peak, which reportedly narrows to one foot, is more intimidating. 

Side note:  Mt. Katahdin is the northern terminus for the Appalachian Trail.  While we were on the summit, we saw a hiker who had just completed the entire trail arrive at the famous terminus sign.  I'll never forget the look on his face!  Some of his family was there to greet him.​

I would avoid doing this hike in the summer months.  I know from experience, since we roasted on this hike last summer and turned around at the saddle because of the heat and intense sun.   

This is a unique hike that not many get to experience.   This beautiful mountain won't make it easy for you to gain its summit, or even get to its approach ridge.  The Nevada desert is stark and hard and the limestone unforgiving.  And, the only flat spot is found briefly on the saddle above the approach drainage.   Fred and I are lucky to be able to explore this exquisite part of the southwest.  Now when we see Moapa from I-15, we can see how high we got on that very vertical mountain.

References:
Indian Names in Utah Geography.  From Utah Historical Quarterly Volume 1, Number 1-4, 1928 by Utah State History.

Carpenter, J.A., 1989. Structure of the southern Mormon Mountains, Clark County, Nevada and regional structural synthesis : fold-thrust and basin-range structure in southern Nevada, southwest Utah, and northwest Arizona.  Master's thesis dissertation from Oregon State University.