Hot springs in New Mexico

New Mexico's thermal springs follow the Rio Grande Rift, a zone where the crust is pulling apart from southern Colorado to the Mexican border. The New Mexico Bureau of Geology and Mineral Resources explains that rain falling on the ranges along the rift sinks 3 to 5 kilometers, is warmed by the high heat flow of the rift, and rises again along rift faults. In the Jemez Mountains, a few springs are linked to cooling magma beneath the southwest margin of the Valles Caldera, and their water emerges along the Jemez fault zone. A separate group lies along the forks of the Gila River in the southwest.

The springs on public land are managed by several agencies. The Santa Fe National Forest's Jemez Ranger District manages the springs of the Jemez Mountains around the Valles Caldera National Preserve, a National Park Service unit. In the north, the Bureau of Land Management's Taos Field Office manages the Rio Grande del Norte National Monument, where springs emerge on the banks of the Rio Grande gorge; the BLM closed road access to two of them during bridge work in 2023. In the southwest, the Gila National Forest and the Gila Wilderness surround Gila Cliff Dwellings National Monument, where the Middle Fork of the Gila River leads to backcountry springs.

Winter and fire season both affect access. The Forest Service closes Forest Road 376 to San Antonio Hot Springs when snow makes the road impassable, usually in December, and reopens it on July 1, a later date set for species protection. Summer fire restrictions can close parts of the Santa Fe and Gila forests. Trails up the Middle Fork of the Gila cross the river many times, so river flow controls access in spring.