Via ferratas require rock-face, cliff-y terrain, so it's no surprise that "iron paths" in the West can be found on ski and snowboard mountains known for their steeps.

Fixed “protection” on the rock, such as cables, steps, pegs and ladders allow inexperienced climbers to hook in and safely ascend on rock faces. Some via ferratas even incorporate hanging bridges. Reservations required for guided tours from 90 minutes to four hours. Here's a look at the "iron roads" within the trail-map boundaries of five resorts in the West.

The highest elevation for a via ferrata sits in Arapaho Basin's East Wall. A chairlift ride to mid-mountain, then an OHV ride gets to the base of the climb at 11,800 feet elevation. The full-day climb ascends 1,200 feet to the 13,000-foot top ridge of A-Basin. A shorter version goes to an abandoned mine shaft for a history lesson.

In the northern Rockies, Jackson Hole built the most extensive via ferrata in the West. A gondola ride delivers climbers to extensive route layout in upper-mountain Casper Bowl. A dozen routes – from introductory to most difficult – and a 120-foot suspension bridge await. Rates include two-hour practice climb, half-day option or six-hour full day on the rock, all spread across rock face with 500 feet of vertical drop.

In the southern Rockies, Taos Ski Valley has open a via ferrata complex on the famous cliffs of Kachina Bowl. At 11,500 feet above sea level, beginner and intermediate routes criss-cross the Kachina face and include a 100-foot-long bridge suspended 50 feet in the air. More advanced climbers move over to the infamous K Chutes that has a 50-foot cable walk.

In California, Mammoth Mammoth is one of two resorts in the state with a via ferrata. A gondola ride to mid-mountain McCoy Station arrives below the Caldera Overlook. Six routes await: three beginner, two moderate with a suspension bridge between, and one expert. Climbs are 180 feet long for three-hour private and 90-minute group tours.

The other is Palisades Tahoe, where the lower mountain's iconic Tram Face is ideal for fixed-route climbing. A 4x4 ride and short hike gets climbers to four routes of varying difficulty that ascend some 800 feet of rock wall. Routes were designed with kids in mind, and 4x4 await at the top for return ride to the Olympic Village.

Summer has arrived in Colorado's high country, and a quartet of high-altitude resorts in Summit County are cranking up for a bustling summer at four of the Rocky Mountain's busiest mountains.

Typically opening mid-June, standard warm-weather attractions include scenic chairlift or gondola rides, coasters and slides, hiking and mountain biking, disc golf, climbing walls, and music, food and drink. Expect that some labor-intensive activities like ziplining may have hours curtailed or, in the case of Breckenridge and Vail, be shut down.

At Arapahoe Basin, Summit County's only via ferreta has half- and full-day guided tours on the "iron way" -- a series of iron rungs fixed in the rock face -- that begin at 12,000 feet of elevation, and top out at the 13,000-foot summit on West Ridge. Near the base, the Aerial Adventure Park runs ziplines, swings, and balancing acts through old-growth forest.

Down the road at Keystone, tubing lives on into the summer, as crews pile up leftover snow atop Dercum Mountain (11,640). Lanes typically stay open into July, 10 a.m to 2 p.m. You must buy a ride up the gondola to the summit, and pre-pay by the run for tubing. Plenty of other activities at mountain-top Adventure Point.

On the other side of Dillon Reservoir, the force of gravity prevails at Breckenridge in the summertime. The Gold Runner Alpine Coaster pitches down 2,500 feet on elevated tracks, with two 360-degree loops and a top speed of 27 mph. The resort also has three alpine slides that run 2,600 feet down concave tracks -- with manual braking.

And to the west, Copper Mountain's summer starts in the base area. Check out bumper boats on West Lake, and a challenging go-kart track. The Woodward Wrecktangle presents a dozen obstacles to overcome in the Woodward Copper extreme sport complex. All-day summer pass includes Wrecktangle, unlimited rides up the chairlift, and limited shots at other activities.

The cheapest activities at any of the resorts are hiking and mountain biking. Check Forest Service regulations for e-bikes. Most have designated trails.

Many have stared amazed as rock climbers wind their way up seemingly vertical cliffs in the Western mountains, but few take the plunge. But now, the advent of via ferratas -- "iron roads" -- has brought the holds, cracks, caribeeners and safety of rock climbing to a wider audience.

Rock climbing is a specialized sport, with its own equipment and techniques. But European-based via ferratas have begun to spring up in the U.S. mountain country to make the sport more accessible to more people.