⏵ Course guide · Denali State Park ultra
The Kesugi Ridge Traverse sends a small, capped field across about 31 miles of alpine ridgeline in Denali State Park, mostly above treeline, with views of Denali itself on a clear day. I will walk you through the elevation profile and terrain first, then give you a pacing and fueling plan built for a remote, cairn-marked course. Free calculators along the way to dial in your own numbers.
These facts come from the official race site's Race Info and Course Description pages. Check the current year details and registration window before you commit. Race logistics change year to year.
Both distances start at Little Coal Creek Trailhead (Parks Highway Mile 163.9). The Full Traverse continues about 31 miles to Byers Lake Campground; the Half Traverse ends near mile 14.2 at a rock formation called "The Doors," where runners then walk the Ermine Hill Trail out to the highway at their own pace.
The course climbs steadily from 1,400 feet at the start to a high point around 3,500 feet within the first four miles, then largely stays on or near the alpine ridge, marked mostly by cairns. On a clear day the views open up to the Eldridge Glacier and Denali itself. That same exposure means fast-changing mountain weather is part of the deal, not a rare exception.
Full Traverse runners continue past The Doors, drop to about 1,500 feet, then climb back to nearly 3,000 feet around Golog Point near mile 20. From roughly mile 25, the course begins a long, switchbacked descent via the Cascade Trail down to Byers Lake, finishing at the Byers Lake Group Campsite at about 800 feet. The official course notes even flag the final stretch: once you cross the bridge near the lake, you still have 1.6 miles left, so do not let the water in view fool you into thinking you are done.
The combined field is capped at 100 entrants, split roughly 50 and 50 between the two distances, and it fills through a first-come registration window rather than a lottery. The race's own course description does not soften the difficulty: long-distance trail running experience is called a must, sections are described as extremely technical and swampy, and past editions have brought rain, snow, cold, and limited visibility even in August.
Without published mile-by-mile cutoffs, pacing here is about respecting the terrain and the weather more than chasing a number. Build your effort around the two real climbs, the early push to 3,500 feet and the return to near 3,000 feet at Golog Point, rather than treating the whole course as one long ridge run.
The temptation on a point-to-point ridge course is to let gravity carry you once you're past the early climb, but the terrain climbs back up near mile 20 at Golog Point after dropping to 1,500 feet. A grade-adjusted pace target for both climbs, rather than one flat number for the whole course, keeps you honest about what effort the second ascent actually costs after 20 miles of alpine terrain.
Because parts of the course are described as extremely technical and swampy, your per-mile time on those stretches will not match your time on the smoother trail sections, sometimes by a wide margin. A race-time prediction built off your actual effort on similar technical Alaska terrain, not a flat road pace, gives you a more honest read on your total time than raw mileage math will.
⏵ Free tools to pace this course
This is a point-to-point through remote alpine terrain, not a looped course with frequent aid, so your own carried fuel and hydration plan matters more here than at a typical aid-station heavy ultra.
Aim for roughly 60 to 90 grams of carbohydrate per hour, and sodium in the 300 to 700 mg per liter range, leaning higher if the day turns warm and exposed above treeline. Given the remote, cairn-marked nature of the course and the fast-changing weather past editions have seen, plan your carried nutrition and hydration as if support will be minimal between the start and the finish, because on this course it largely is.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a remote alpine ridge day with the free ultra fueling calculator. Browse the rest of the free running tools at the tools hub.
⏵ Train for it with Summit Line
Get a race-day plan built around YOUR fitness and this exact alpine ridgeline profile. Summit Line reads your real training, builds a plan for exposed, technical climbing at altitude, and rehearses your fueling so race day is something you execute, not guess at.
The race's own course description is blunt about it: "this is not a race for beginners," and long-distance trail running experience is called a must. The Full Traverse covers about 31 miles with 6,200 feet of gain and 6,800 feet of loss, much of it above treeline on an alpine ridge marked mainly by cairns. Past editions have seen rain, snow, cold, and limited visibility, and sections are described as extremely technical and swampy, so the difficulty here is as much about exposure and route-finding as raw mileage.
The Full Traverse carries about 6,200 feet of total gain and 6,800 feet of loss over roughly 31 miles, per the official course description. The course starts at 1,400 feet and climbs steadily over the first four miles to a high point around 3,500 feet, then rolls along the ridge, dropping to 1,500 feet before climbing back near 3,000 feet around Golog Point at mile 20, and finally descending a long switchbacked stretch via the Cascade Trail down to the 800-foot finish at Byers Lake.
With a 9 AM start and a genuinely remote alpine ridge course, plan to be self-sufficient for the bulk of the race. Aim for roughly 60 to 90 grams of carbohydrate per hour, and sodium in the 300 to 700 mg per liter range, adjusting up if the day turns warm and exposed above treeline. Because this is a point-to-point with a shuttle back to the start area rather than a looped aid-station network, carry what you need between the trailhead and the finish, and build your numbers with the free ultra fueling calculator before race day.
Specific mile-by-mile cutoff splits are not published on the official race site, so pull the current-year race information from kesugiridgetraverse.com before you build a pacing plan. What is confirmed is that this is a technical, alpine, often weather-exposed course, so build real margin rather than assuming flat-ground pace will carry you across 31 miles of ridgeline.
The course runs almost entirely above or near treeline, marked mostly by cairns, with views of the Eldridge Glacier and Denali itself on a clear day. Past editions have seen the full range of Alaska mountain weather: rain, snow, cold temperatures, and limited visibility, even in August. Sections are extremely technical and can be swampy, and familiarity with the route matters given the sparse marking. Come prepared for genuine alpine conditions, not a groomed summer trail day.
Entry is first-come, first-served on UltraSignup, not a lottery, opening at 9 AM Alaska Daylight Time on May 1 each year. The combined field is capped at 100 entrants, ideally split 50 in the Full Traverse and 50 in the Half Traverse, and a waitlist opens once capacity is reached. Given the small field and fixed registration window, mark your calendar for the exact opening time rather than registering whenever you get around to it.
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<a href="https://runsummitline.com/guides/kesugi-ridge-traverse">The Kesugi Ridge Traverse course guide</a>This guide is independent and for planning only. The course details, dates, entry rules, and elevation figures come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The fueling and pacing advice is general and not medical advice.