Because of a seeming similarity in appearance to the dome of the Mormon Tabernacle in Salt Lake City, early Mormon ranchers dubbed this small but fun and aesthetic peak such. It is literally right next to the road (with a short but miserable approach due to brush) and can be climbed in less than two hours round-trip (3-4 hours is more likely for most parties, though), but this peak is the epitome of one that packs a lot of bang for the buck. Once the approach is over, the route is highly enjoyable, and summit views are jaw-dropping.
This peak has no route easier than Class 5 on it, with the easiest going at about 5.2, though the exact variation I took had me in one spot that felt more like 5.4. Pitches can be rappelled but don't offer too much in the way of opportunities for placing protection, so leave the nuts and cams and such at home, bring rope and slings for rappels if desired, and be ready for a few pitches of Class 5 scrambling, some of it highly exposed.
It's worth the scare, though. The views from up top extend west to the Pine Valley Mountains and east to the peaks that comprise the west rim of Zion Canyon, but the money shot is that between the summit and Zion Canyon's west rim. This is Kolob Terrace country, remote and scenic, and you get a killer view of two of Zion's most iconic peaks, North Guardian Angel and South Guardian Angel, the latter of which is also reputed to be one of the most challenging and least climbed of the major nontechnical peaks of the Southwest (challenging mainly because of the route-finding and climbing challenges along the approach).
In short, this little peak kicks some serious ass.
Getting ThereFrom Virgin, turn north onto Kolob Terrace Road. This road, even though it passes through Zion National Park, is not signed for the park, but it is signed for Kolob Reservoir. Drive 9.5-10.5 miles on this paved road and use one of the small pullouts to park. Park as close to the northwest ridge of Tabernacle Dome as you can.
RouteFrom the road, it is a short but unpleasant hike and bushwhack to the base of the peak. Drop into a wash, climb out, drop into another wash, climb out again, and then drop into a third wash adjacent to the base of the peak. Use game trails wherever you find them. Expect to bleed if you do not have long sleeves and pants on.
There is a much easier approach possible from a dirt road shortly up the road, but this would mean crossing private property. I have no idea how friendly the landowners are and certainly do not advocate trespassing.
You will find that a number of chutes/gullies head up to the lower portion of the northwest ridge; your goal is to find the one that works the best. I'd provide a photo with a route line, but I'm not so sure that the way I planned from the road was the way I actually went up. Instead, use these comments and the photos below: find a somewhat brushy gully that in 2012 had a large dead tree fallen in it near the top that made for useful handlines, traverse to your left a bit (includes an exposed section), and climb a clean chute that resembles a slot or a dryfall. If you use those lines, the climbing stays at about 5.2; a different chute I used on the ascent was more like 5.4.
These gullies present the most technically difficult parts of the climb, but the most unnerving section is yet to come.
Above the chutes, work your way left and gradually up and to the right of some prominent hoodoos until you reach the base of the northwest ridge proper. Now head up. The ridge climbs about 250' to the summit from here. At first, you're on pretty easy Class 3/4 slabs. Around the middle, though, the ridge steepens and the holds become a bit more elusive; the going is now Class 4/5 and exposed to the point that a slip would probably prove fatal, and two trees with slings around them attest to the fact that some choose to rappel this section on the descent.
Note: to the left is a nice-looking ledge. Don't use it. It leads to harder climbing and terrifying exposure, as I am told by a source I consider highly reliable.
Above this steeper section, the grade abates and becomes Class 2/3 the rest of the way. The highpoint is one of a few small outcrops, and the summit area itself is a big slickrock bowl with expansive views. At the highpoint in 2012, there was a cairn but no register.
Also note: if you want to rappel the steepest part of the ridge, one 60m rope will not get you down the whole ridge but will get you down the steepest and most-exposed section. I recommend using the lower of the two slung trees. That lower tree, in 2012, was, obviously, closer to the bottom of the exposed section, but it also was directly on the route and had three seemingly reliable slings. I ran my rope through all three and didn't bother setting my own sling or using a rappel ring. But it's your life, so if you want to set a new sling and use a ring as well, do it.