41
PDI
10.9 mi
DISTANCE
5,142 ft
GAINED
8.8 %
AVG. GRADE
FULL CLIMB STATS
Page Contributor(s): Jorge Vargas Campos, Mexico
INTRO
Casa de Máquinas is widely rated the hardest climb in Mexico and one of the toughest in the world (currently PJAMM world rank #65) - 11 miles (17.8 km) and 5,100 feet of gain at an 8.7% average grade, climbing from the Río Las Adjuntas up to over 8,100' in the Sierra Gorda highlands of Querétaro. It takes its name from a small hydroelectric powerhouse (casa de máquinas) near the base of the climb, where Federal Highway 120 crosses the river.
What makes it hard is the sustained, unrelenting nature of the grade - there's essentially no flat or downhill respite over the full 11 miles, and the road climbs out of a deep river canyon into thin, dry, semi-desert highlands with little shade for much of the ascent. The route passes through a handful of small rural communities (Vega de Ramírez, Las Huertas, Las Vegas de Zimapán) on its way up toward Cadereyta de Montes.
As of August 2026, Querétaro's federal transportation agency (SICT) has more than 130 million pesos of active investment in Cadereyta-area road infrastructure, including a rehabilitation of Federal Highway 120 itself (reported about 75% complete) and a separate paving project on the nearby Vega de Ramírez road. Road surface conditions on this climb have likely been improving through 2026, though as with any active construction zone, expect the possibility of short delays or rough patches until the work wraps up.
PLAN YOUR ROUTE
We've partnered with Sherpa-Map.com to bring you the best route planning tool. With a PRO Membership you can use this climb as a reference when creating your route. Casa de Máquinas climbs at an 8.75% average grade over 11.0 miles (17.8 km), with 5,509 feet of total elevation gain - among the largest continuous elevation gains of any climb in Mexico. The grade doesn't back off for long stretches; there's little in the way of flat sections to recover on, which is the main reason this climb has such a fearsome local reputation.
See more details and tools regarding this climb's grade via the "Profile Tool" button.
Roadway: Paved, on Mexican Federal Highway 120. As of August 2026 the highway is undergoing an active rehabilitation in the Cadereyta de Montes area (reported about 75% complete), part of a 130+ million peso SICT infrastructure investment - expect improving surface conditions through the rest of 2026, but also possible construction-related delays or rough patches until the work is finished.
Traffic: Moderate. Highway 120 is a real, used federal highway connecting Querétaro's Sierra Gorda communities, not a dead-end recreational road - expect trucks and local traffic, and ride the shoulder with the same caution you'd use on any Mexican federal highway.
Parking: No formal trailhead or lot. Most riders start from the highway near where it crosses the Río Las Adjuntas, or drive up from San Juan del Río or Querétaro city and park along the roadside near the base of the climb.
No formal services directly on the climb - stock up on water in Cadereyta de Montes or San Juan del Río before heading out. The ascent is long, exposed, and in a genuinely hot, dry semi-desert climate for much of the year, so carry more water than you think you'll need. Basic small shops exist in the communities of Vega de Ramírez and Las Huertas along the route.
Before heading out on any cycling adventure check out our Things to Bring on a Cycling Trip and use our interactive check list to ensure you don't forget anything.
Casa de Máquinas is most easily reached from San Juan del Río or Querétaro city, both roughly 1.5-2 hours away by car. The Sierra Gorda Biosphere Reserve and the Zimapán reservoir are both nearby and worth combining with a visit. Given the active 2026 SICT roadwork on Federal Highway 120 through Cadereyta de Montes, it's worth checking current construction status before your trip.
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JosueR
This road was built exclusively to access the electric company's infrastructure at the bottom, thus the traffic is very light as its mostly traversed by the company's employees. we started this climb at 1PM in early march and the temperature quickly reached 43C. The excessive heat combine with very steep segments throughout this climb made it very challenging. You have to descend into the canyon first and then climb out of there as it is not a through road.
