La cajita de herramientas offers a direct, engaging climb on the Pared Principal of Cerro de las Viboras, inviting climbers to test their technique and resolve on a single 85-foot pitch. The route shares its approach with its sibling, Caja de herramientas, but veers left, tracing a line marked by discreet grey bolts that catch the eye against the rock’s textured face. This subtle divergence carves out a distinct experience, one rooted in attentive footwork and steady movement rather than flashy cruxes. As you ascend, the rock’s character emerges under your fingertips—solid yet demanding, with pockets and edges that coax rather than challenge brute force. The sun warms the wall across the day, but the Northern Mexico air remains dry and welcoming, sharpening focus on each clip and hold.

Prepare for engagement on moderate terrain that pushes just beyond the comfortable 5.10+ rating, with a grade that feels honest and clean, favoring climbers who hone their foot placement. The grey bolts provide confident protection with quickdraws spaced to encourage smooth climbing and efficient clipping—12 draws are ample for the pitch length. The setting on Cerro de las Viboras delivers more than just rock; subtle breezes wind through sparse vegetation below, and distant mountain ridges frame a quiet landscape, reminding you that this climb unfolds in a rugged realm away from heavy crowds.

Access is straightforward, though the approach requires attention to trail markers as you move from the base of El Reliz across undulating paths that balance shade and sun. The well-maintained approach trail leads you in 20 to 30 minutes, rewarding with both clarity and anticipation. Climbers will find this route ideal as a midday endeavor, when the wall enjoys balanced light and warmth without midday scorch. Descending is a simple, single-rope rappel down the face, so be sure to rig with care and double-check anchors before lowering.

Gear up in light hiking shoes for the approach and bring climbing shoes capable of precision edging. Hydration is key here—the dry northern climate saps moisture faster than expected even during shorter climbs. Local advice suggests starting early to beat afternoon heat and watching for sun exposure on the northern-facing wall. While the climb doesn’t demand extreme technical gear, reliable quickdraws and a comfortable harness setup make the experience smooth and focused.

La cajita de herramientas stands as a measured challenge in Sonora’s climbing landscape: neither a flashy showpiece nor a grind, but a rewarding gain for those who appreciate clean lines and steady progression. For climbers seeking a genuine encounter with the rock in a spot rich with quiet energy and minimal fuss, this route delivers a compelling single-pitch experience worth the trip north of the border.