Glorieta Pass

Glorieta Pass sits in the Sangre de Cristo Mountains of northern New Mexico, in Santa Fe County, southeast of Santa Fe. It is the most direct way through the mountains between the upper Pecos River valley to the east and the upper Rio Grande valley to the west. I-25 crosses here, along with U.S. 84, U.S. 85, and the BNSF Railway. The same gap once carried the westernmost leg of the Santa Fe Trail.

For a trucker, this is the climb on the main Santa Fe to Colorado leg of I-25. The summit is roughly 7,450 to 7,500 feet. I-25 crosses near 7,452 feet per the route description in Wikipedia's "Interstate 25 in New Mexico." No official grade percent is published, so treat the crossing as a long moderate grade rather than a steep one, with a winding descent through Apache Canyon on the west side north of Exit 294.

New Mexico does not run a mandatory chain-control program. There is no chain-law season here, no posted chain-up levels, and no named chain stations on Glorieta Pass that show up in any state source. Closures are weather driven and discretionary. NM State Police and NMDOT shut segments during storms, and NMDOT names the I-25 corridor between Santa Fe and the Colorado border as a likely closure zone in winter. Check NMRoads.com before you roll.

• Summit sits roughly 7,450 to 7,500 ft; I-25 crosses near 7,452 ft (Wikipedia, "Interstate 25 in New Mexico")
• Carries I-25, U.S. 84, U.S. 85, and the BNSF Railway through the Sangre de Cristo Mountains (Wikipedia, "Glorieta Pass")
• Key exits include 290 (US 285), 294 (Cañoncito at Apache Canyon), 297 (Valencia), and 299 (NM 50, Glorieta/Pecos) (Wikipedia, "Interstate 25 in New Mexico")
• No official grade percent or climb length is published by NMDOT in the sources reviewed
• New Mexico has no mandatory chain-control program and no posted chain stations on the pass
• NM Stat. 66-3-847 permits chains or studded snow tires when required for safety because of snow or ice
• NMDOT names the Santa Fe to Colorado border I-25 corridor among likely winter closures (NMDOT blog, Nov. 6, 2024)

There is no chain-control season on Glorieta Pass, because New Mexico does not order chain-up at posted stations the way Colorado or California do. What governs you here is NM Stat. 66-3-847, which bars metal-contact tires but permits tire chains of reasonable proportions or studded snow tires when conditions tend to make a vehicle skid on snow or ice. NMDOT sets no start or end dates for studded tire use. The road does not close on a schedule. It closes when a storm forces it, at the discretion of NM State Police and NMDOT, and it reopens once crews clear and treat the lanes. Carry chains for safety, watch the forecast, and obey any temporary closure.

The pass is best known for the Battle of Glorieta Pass, fought March 26 to 28, 1862, the decisive fight of the Civil War's New Mexico Campaign. Union troops under Col. Slough and Maj. Chivington destroyed the Confederate supply train, which forced Sibley's Texans to abandon the New Mexico Territory. People often call it the "Gettysburg of the West." The federal battlefield commission rated it Priority I, Class A (American Battlefield Trust; NPS, Pecos National Historical Park).

The gap has carried traffic for a long time. In the 19th century it held the westernmost leg of the Santa Fe Trail between Santa Fe and the High Plains, later U.S. 84 and 85, and then I-25. The New Mexico and Southern Pacific Railroad built a line through the pass in 1879, and by March 1881 the route was part of the second North American transcontinental railroad. In November 2022 the historic railroad semaphore signals through the pass were retired and replaced with modern signals (Wikipedia, "Glorieta Pass").