According to this website, Full Lemmon Drop trail descends about 9,200 feet but also ascends about 3,000 feet in the process. I have not ridden it, but it sounds pretty brutal and technical. It’s actually a combination of several smaller trails. Temps at the top are a good 20 degrees cooler than at the desert floor. I might go ride a small part of it at the top of the mountain this summer. Apparently, the people that ride it love how significantly the scenery changes from the top to the bottom.
Lemmon Drop is a tough all day ride with lots of climbs. Many highlights including Green Mountain Trail, Bug Springs, Milagrosa and more. From the spruce, fir, aspen and pine forest to the Sonoran Desert outside Tucson.
Cloudcroft to Alamagordo, NM is another long descent. So is Brianhead, Utah with several different ending points and trails. Skyline Drive in Utah would also have many huge drops, to Strawberry Reservoir one I’d love to ride.
Not sure in the US at all. I think our biggest MTB descent in WI is about 400ft and our lift operated park has a net elevation of 170ft! Last Saturday I was in Ecuador and we started at 16k feet and descended down to 12k. We were supposed to connect another trail that dropped down to around 7k but it was raining big-time at the lower elevations. Next time!
I don’t think “longest” necessarily means most vertical right? If not then by total miles my favorite long descents are Hermosa Creek Trail(Durango, CO) = about 22 miles and The Whole Enchilada(MOAB, UT) = about 33 miles. Pikes Peak may have a lot of vertical, but the longest trail in Pikes Peak is the Barr Trail which is only about 12 miles in length.
Monarch Crest is 34 miles with about a 6000 foot descent.
Three trails combined into one famed ride: The Monarch Crest Trail (14 miles), which follows a portion of the Continental Divide Trail, then turns north/left/down onto Silver Creek Trail (4.5 miles), and runs right into a portion of the Rainbow Trail (10 miles). The final 5 miles are downhill and paved back to Poncha Springs.
You’ll encounter everything: Singletrack, doubletrack, fire road, smooth and packed, rocky and loose, great views, and entirely fun!