Independence Pass

Colorado Highway 82 tops out at 12,095 feet crossing the Continental Divide between Aspen and Twin Lakes — the highest paved state highway in Colorado — and for eighteen-odd miles on either side of the summit the roadside cliff bands of the Sawatch Range have been quietly accumulating routes since the 1950s. Climbing here goes back to some of the state’s earliest forays onto steep 5.7 rock, and testpieces from Henry Barber and Lynn Hill during the Golden Era of free climbing; the Pass is also credited with some of Colorado’s first rappel-bolted sport routes. Despite that history, The Pass — the 2023 guidebook covering the whole corridor — is described by its publisher as the area’s first full-color guide, which tells you something about how long this place stayed a local secret. Today it totals close to 1,000 documented routes from bolted 5.4 slabs to 5.14 roof cracks, spread across the Grotto Wall (the densest concentration of routes, on the Aspen side), the Boulderfield sectors near mile marker 52, and — the crag we’d send you to first — Monitor Rock.

Plate reserved — hand-drawn map & photographs to come

Monitor Rock

Monitor Rock, also called Big Rock, is a free-standing granite dome about five miles past Twin Lakes on the pass’s east side, and it is the single most important crag in this whole corridor: virtually no approach, roughly 60 routes, and granite hard and polished enough that it favors bolted face and slab climbing over the cams and nuts the rest of the Pass wants. The West Face is the main event — shaded in the morning, mostly bolted steep slab in the 5.9–5.11 range — while the East Side (Clairabell Mine Wall) catches morning sun and gives a quieter, shadier-by-afternoon alternative when the West Face fills up. Because Monitor Rock sits at lower elevation than the pass road itself and keeps year-round access from the Twin Lakes side, it stretches the local season by roughly a month beyond what the gated summit allows in either direction.

Chosen moderates

Star ratings could not be recovered from a live Mountain Project session for this research pass — confirm them before quoting a number in print.

Route	Grade	Sector	Notes
Left Cheek	5.9	Butt Wall, Monitor Rock	Bolted sport, ~80 ft.
Going Greek	5.9	Butt Wall, Monitor Rock	Bolted sport, ~100 ft.
Home Wrecker	5.9	Clairabell Mine Wall, Monitor Rock East	Sport; morning sun, afternoon shade.
Broomhillda	5.10+	Butt Wall, Monitor Rock	Bolted sport.
Master Blaster	5.10	Clairabell Mine Wall, Monitor Rock East	Sport.
Twin Cracks	5.8	Lower Grotto Wall	Trad: two parallel finger/hand cracks to a roof, traverse right at the crux; rappel with a single 60m rope.
Guide Route	5.2–5.8 (multipitch)	Monitor Rock	8 pitches to the summit — a moderate way up the whole dome rather than one hard pitch; rack of cams, wires and draws.

Season & logistics

CO-82 gates closed for winter (typically late October/November) and reopens around Memorial Day; Monitor Rock’s east-side access keeps it climbable somewhat longer on both ends. Prime window is June through September, with shoulder months preferred to dodge summer afternoon thunderstorms. All climbing sits within White River National Forest; Difficult Campground, five miles from Aspen, is the largest nearby option, with Lincoln Gulch Campground (7 sites) closer to the Grotto Wall and dispersed sites along Lincoln Creek Road. Twin Lakes and Leadville serve the east side, Aspen the west.

The book to buy

Jason Brown and Mike Schneiter, The Pass: A Climber’s Guide to Independence Pass and Monitor Rock (Wolverine Publishing, 2023) — the area’s first full-color guidebook, covering the corridor’s nearly 1,000 routes. Pair it with Mountain Project’s Independence Pass and Monitor Rock pages for current beta, and check the Independence Pass Foundation and White River National Forest for seasonal road status before you drive up.