In this trail guide by explorenm.com, the author notes how this is one of their favorite hikes in Carlsbad thanks to the "variety of cacti and other desert plants, and some history," seen along the way. "If the preceding winter had sufficient precipitation," they continue, "the flowers are likely to be stunning in the spring."

As this hike begins and ends on Desert Loop Road, you must walk along the improved dirt road to form a loop. Most visitors choose to park at the Rattlesnake Canyon Trailhead, which rarely fills. You could also find a pull-off on the road and begin there. There is no preferred direction to hike the loop, and neither water nor restrooms are available along the way. The road is also not recommended for larger vehicles or passenger vehicles with low ground clearance.

As mapped, this loop is an excellent stand-alone day hike, but offers the option of a longer overnight trip along the Guadalupe Ridge Trail. Overnight use in Carlsbad, however, does require a permit "which can be obtained at the visitor center during business hours," according to the park.

Sources: https://www.explorenm.com/hikes/RattlesnakeCanyon/ https://www.nps.gov/cave/upper-rattlesnake-canyon-to-guadalupe-ridge-loop.htm