Running the rim of a forgotten canyon

The Black Canyon of the Gunnison sits on the wrong side of the Rockies for most international travellers, tucked between Montrose and Gunnison in a corner of Colorado that barely registers on the average road map. Locals call it the Black because the gorge is so narrow and so deep that sunlight reaches the river for only a few minutes around midday. From the rim, the Gunnison River looks like a piece of twisted wire two thousand feet below, and the noise of the water is something you feel in your boots rather than hear with your ears.

For runners, the appeal is not the distance or the elevation gain in the abstract. It is the way the trail hangs on the edge of the cliff, refusing to retreat from the void, and the way each overlook resets the scale of the day. A five kilometre warm-up here delivers more visual violence than a marathon on a city river path, and the rock itself has a colour range that moves from charcoal through rust to a dull bronze that photographs like bruised metal.

The Rim Trail is not a single through-route but a series of connected segments along the South Rim, with a smaller section on the North Rim reached by a separate road. Most runners piece together a one-way or out-and-back adventure, stringing together sections like Warner Point, Oak Flat, the Devil's Lookout complex, and the stretch past the visitor centre. The total paved and unpaved distance along the South Rim alone is around seven miles one way, though the temptation to detour to every named overlook multiplies that figure quickly.

I planned the run during a slow week in Denver, after a string of meetings that had left me craving dirt under my shoes and a sky that was not framed by office windows. A half-drunk flat white in a Brunswick cafe back in Melbourne had been the seed of the idea months earlier, scribbled on a napkin beside a list of Colorado towns that sounded like they belonged in a Western.

What the Black Canyon actually is

The canyon was carved by the Gunnison River in roughly two million years, a geological blink that produced walls of Precambrian gneiss and schist that rise more than 2,700 feet in places. The rock is among the oldest exposed on the continent, dated to around 1.7 billion years, and the dark tone that gives the gorge its name comes from the density of that stone rather than any pigment. For runners who care about surfaces, the trail traces the top edge of this formation, so the substrate shifts constantly between crushed granite, slickrock slabs, and patches of sandy loam where runoff has carved shallow channels.

The park itself was established in 1999 and upgraded from a national monument to full national park status after years of advocacy. That bureaucratic shift matters on the ground because the trail system has since been formalised, with graded segments, defined overlooks, and the kind of signage that lets a runner move fast without second-guessing each junction. Compared with many Australian national parks, the visitor infrastructure here feels modest, but the trail maintenance is relentless.

The route from North Vista to Cedar Point

The classic running traverse starts at the North Vista Trailhead on the North Rim and crosses to the South Rim via the dam, though most runners simply commit to one rim to avoid the forty-minute detour between them. The South Rim route I pieced together began at the visitor centre and ran east through the campground loop, then south past Pulpit Rock, before reversing at Cedar Point and returning along the same alignment with short spurs to overlooks like Chasm View and Painted Wall.

Chasm View is the one that stops people in their tracks, because it looks directly down the narrowest section of the canyon where the walls are only 1,100 feet apart at the rim and 40 feet apart at the river. Running past it requires a small act of discipline: the body wants to stop, the legs want to keep moving, and the eyes keep drifting back for one more glance. The Painted Wall across the way is the tallest cliff in Colorado at 2,250 feet, streaked with pink pegmatite that catches the late afternoon sun like an old bruise.

For anyone familiar with the Bibbulmun Track in Western Australia, the rhythm of the trail is similar in its quiet persistence, but the exposure here is more theatrical. There is no tree canopy to soften the views. The trail clings to the edge, and the sensation of running along a lip rather than through a forest is the entire point.

How the trail feels underfoot

The surface alternates between firm dirt and rock-hard sections where the path has been compacted by decades of boots. Trail shoes with a moderately aggressive lug pattern worked best, though a road shoe would have been manageable on the more graded stretches. The grade is mostly gentle, with only short climbs near the campground loop and a few rocky pitches around Devil's Lookout, which makes the trail unusually fast for something this dramatic.

The biggest running-specific hazard is not the altitude, which tops out around 8,300 feet, but the lateral drop. Several sections have no fencing, and the path narrows to a couple of metres with the canyon falling away immediately on the river side. A misstep on a loose rock is not a stumble onto grass. It is a stumble onto vertical. Australian runners used to the edges of Mount Buffalo or the cliffs along the Great Ocean Road coastline will recognise the same prickly alertness, but the exposure here is multiplied by the sheer depth.

I kept my gaze mostly on the trail through these sections and saved the views for the official overlooks, which is the only way to move quickly without inviting a disaster. A handheld bottle was enough, since the elevation gain is too modest to demand a pack, though I carried a light shell in case the afternoon wind funnelled up the canyon as forecast.

The altitude and weather factor

The South Rim sits between 7,500 and 8,300 feet, which is high enough to make the first kilometre feel thick in the lungs but not high enough to cause real trouble for sea-level visitors. I had spent three days in Denver beforehand, which made a noticeable difference, and would recommend at least a night in Montrose or the nearby town of Ridgway before attempting anything longer. Australians flying in from Melbourne or Sydney often underestimate this adjustment, because the equivalent elevation in Australia simply does not exist outside a handful of High Country peaks in the Victorian Alps.

The weather is the more pressing variable. The canyon creates its own microclimate, with temperature swings of twenty degrees between morning and late afternoon, and sudden gusts that come up the gorge without warning. I started at sunrise in long sleeves and finished in a singlet, having shed layers at the visitor centre. The sun is relentless even when the air is cool, and I burned through a full application of sunscreen rated to the Australian and New Zealand standard AS/NZS 2604, which is the same broad-spectrum formula mandated for schoolchildren at home and felt reassuringly familiar on the tube.

Wildlife and the silence factor

The park is not known for charismatic megafauna the way Yellowstone or Kakadu are, and that is part of its character. Mule deer browse the scrub oak along the rim at dawn, golden eagles ride the thermals above the canyon, and the occasional peregrine falcon streaks past at eye level. I saw a single black bear at the eastern end of the trail, loping across a meadow in the half-light, which was a reminder that the Colorado wilderness still operates on its own terms.

What stays with me is the quiet. The river is too far below to hear, the road traffic is sparse, and the wind moves through the canyon in long, slow pulses rather than the constant hiss you get on a coastal trail. Australian runners who have done sections of the Larapinta in the Northern Territory will recognise this kind of heavy, mineral silence, though the colour palette here is closer to rust than red.

Capturing the run through a lens

Running with a camera is a contrarian choice, and I usually pack light on a trail like this, but I tucked a small mirrorless body into a chest pouch and stopped at four overlooks for short bursts. The early light on the Painted Wall, the long shadow of the rim across the river, and a frame of the trail itself disappearing over a bend were the keepers. The same approach works on Australian trails, where the temptation to film every moment often ruins the moment itself.

For anyone planning a similar trip, the practical takeaway is straightforward: pick one rim, start at sunrise, carry layers and water, respect the exposure, and let the overlooks set the pace rather than the watch. The Black Canyon rewards runners who slow down just enough to register where they actually are, and it returns very little to anyone who treats it as a checkbox between better-known parks.