Ashcroft & the Pitkin Iron Mine: The Ride Most Aspen Visitors Never Find
Share
Castle Creek Road runs south from Aspen past the hospital, past the turnoff to the Maroon Bells, and keeps going. Most people don't follow it to the end. That's exactly why this ride is worth doing.
Where You're Going
At the end of Castle Creek Road sits Ashcroft — a ghost town from Colorado's silver mining era, once bigger than Aspen itself, now preserved by the Aspen Historical Society and listed on the National Register of Historic Places. From the trailhead here, a dirt mountain road climbs toward the Pitkin Iron Mine, gaining nearly 2,000 feet to reach 11,875 feet above sea level, with Castle Peak (14,278 ft) rising directly above you the entire way.
This isn't singletrack. It's a wide dirt road — closed to motorized vehicles but passable by jeep — which means the climbing is steady and the views are unobstructed. What it lacks in technical challenge it makes up for in everything else: the scale of the mountains, the silence, wildflowers in summer, and in fall, aspens that turn a shade of gold you won't find anywhere closer to town.
Real numbers: 8.75 miles, 1,851 feet of elevation gain, ~2 hours up and back.
The Climb
From the Ashcroft trailhead the road winds steadily upward through dense forest before breaking into open alpine terrain as you gain elevation. Castle Peak appears early and stays with you — a massive jagged wall of rock and snow that fills the sky to the east. You're riding directly toward a 14er and you feel every foot of it.
The grade is consistent but not brutal. It's the altitude that gets you. At over 9,000 feet at the start and climbing toward 12,000, even fit riders feel the thin air on the steeper sections. Take your time. There's no need to rush something this beautiful.
Partway up, a small wooden sign appears at the side of the road: Lloyd Llewellyn, 1943–2022. Lloyd was born in nearby Glenwood Springs, spent his life working as a plumber in the valley, and according to those who knew him, Ashcroft was his favorite place on earth. Someone who loved these mountains enough to be remembered here — in the middle of nowhere, at 11,000 feet, with Castle Peak watching over. It puts everything in perspective.
The Top
The Pitkin Iron Mine sits just below 12,000 feet, where the valley opens into a stark alpine cirque. Castle Peak's full profile towers above — sheer rock faces, snow-dusted ridgelines, the kind of scale that makes you feel genuinely small.
From here you can see across multiple drainages, back down the Castle Creek Valley toward Aspen, and up toward the ridgeline that eventually leads to Pearl Pass — the legendary 12,700-foot crossing that connects Ashcroft to Crested Butte on the other side of the range. Pearl Pass is a full expedition in its own right, best done as an overnight or point-to-point with a shuttle. But standing at the mine looking up at that ridge, you understand why people make the journey.
The descent back to Ashcroft is fast, smooth, and deeply satisfying.
When to Go
Late summer and early fall are the best windows. July and August offer wildflowers and long days. September brings the aspens — and this valley might be the best place in the entire Roaring Fork area to see fall color, with Castle Peak as the backdrop.
Avoid early season: the road can hold snow well into June at this elevation. And as always in the mountains, start early — afternoon thunderstorms build fast above treeline.
Getting There
Drive Castle Creek Road south from Aspen past the hospital. Follow it all the way to the end — about 11 miles — to the Ashcroft trailhead and parking area. The road is paved most of the way and accessible in any vehicle.
If you're visiting Aspen without a car, Aspen Moments can drop you at the trailhead and pick you up when you're done.
