Summit Line

⏵ Course guide · Missoula mountain ultra

City to Sky Ultra Course Guide

City to Sky climbs nearly 8,000 feet out of downtown Missoula over Mount Sentinel, University Ridge, House of Sky Trail, and Mount Dean Stone before descending back into the University District, on a 50K course the race itself admits runs closer to 53K. I will walk you through the climbs and the aid station cutoffs first, then give you a pacing and fueling plan built for a real front-country Montana mountain day. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

City to Sky Ultra quick facts

Date
Sunday, October 18, 2026
Location
Missoula, Montana, finishing in the University District
Distances
50K (about 33 miles), 25K (about 17 miles)
50K elevation
Nearly 8,000 ft of gain, over multiple mountain summits
25K elevation
About 2,700 ft of gain, runs the back half of the 50K course
Start
50K at 7:00 AM (Dornblaser-Lewis and Clark Stadium); 25K at 8:15 AM via mandatory bus from Pattee Canyon
Course window
Open 7:00 AM to 6:00 PM (50K); aid station cutoffs at miles 15.5, 21.0, and 29.0
Organizer
Montana Trail Crew, a program of the nonprofit Run Wild Missoula

These facts come from the official race site, including its course and race-details pages. Check the current year details, cutoffs, and mandatory gear list before you commit. Race logistics change year to year.

The course: multiple summits, not one big climb

From the start at Dornblaser-Lewis and Clark Stadium, the 50K climbs the Fire Road and Pengelly Ridge to the summit of Mount Sentinel, descends to the first aid station, then climbs again up the Smokejumper Trail and University Ridge to a remote beacon aid station before dropping to the halfway point at Pattee Canyon. The back half climbs again over the House of Sky Trail, Mitten Mountain, and past the summit of Mount Dean Stone before the long descent home.

Aid stations and cutoffs: five checkpoints across 30 miles

City to Sky spaces its aid stations at mile 5.85 (M Trailhead), mile 10.5 (University Mountain beacon, remote with no road access), mile 15.5 (Pattee Canyon Picnic Area, cutoff 12:45 PM), mile 21.0 (Skyline Ridge Trailhead, cutoff 2:45 PM), and mile 29.0 (Barmeyer Overlook, cutoff 4:45 PM), plus a toilet-only stop at mile 30.3. The overall course is open 7:00 AM to 6:00 PM, but the three intermediate cutoffs are what actually matter, miss one and you are pulled from the course regardless of how much time remains before 6:00 PM.

25K runners bus to a mid-course start

The 25K does not start at the stadium. Runners take a mandatory shuttle bus from the Lewis & Clark parking lot at 7:15 AM to the Pattee Canyon Picnic Area, and anyone dropped off near the start instead of bused will have their bib pulled. From there the 25K runs the exact back half of the 50K course: Skyline Ridge Trailhead, the House of Sky Trail, Mitten Mountain, Mount Dean Stone, and the descent through Barmeyer back to the stadium finish.

No crewing, no pacers, cupless: this is a self-sufficient day

City to Sky does not allow crewing anywhere on course, aid only comes from staff and volunteers at designated stations, and pacers are not allowed for the entire 50K. It is also a cupless event, so you fill your own hydration devices at aid rather than grabbing a cup. Plan your gear and your aid station stops with the understanding that nobody outside race staff can hand you anything on course.

Pacing strategy for nearly 8,000 feet of climbing

With three firm intermediate cutoffs and a course that runs longer than its nominal 50K, pacing against the checkpoints matters more here than chasing a flat-course finish estimate.

Pace the early summit conservatively

Mount Sentinel and Pengelly Ridge hit early while you are fresh, which makes them easy to overcook. A grade-adjusted pace target for the steep pitches keeps your effort honest on that first climb, so you still have legs for the Smokejumper Trail and University Ridge climb to the beacon, the biggest single climb of the race according to the course description.

Check your splits against the mile 15.5, 21.0, and 29.0 cutoffs

Build a finish prediction that accounts for nearly 8,000 feet of gain, then translate it into target arrival times at Pattee Canyon (12:45 PM), Skyline Ridge Trailhead (2:45 PM), and Barmeyer Overlook (4:45 PM). These three checkpoints, not the 6:00 PM course close, are what determine whether your race continues, so know your real buffer at each one rather than only tracking overall elapsed time.

⏵ Free tools to pace this course

Fueling strategy for a cupless mountain day

No crewing and a cupless aid system means your fueling plan has to work entirely within what you carry and what the race hands you directly at each station.

Carbs: plan around your drop bag

Aim for roughly 60 to 90 grams of carbohydrate an hour. Your drop bag gets transported to the Pattee Canyon Picnic Area aid station at roughly the halfway point, so use it as your reset: restock gels, swap flavors, and top off anything you have burned through in the first half before tackling the House of Sky Trail and Mount Dean Stone climbs.

Sodium and layers: cold start, warming climb

The 50K starts before sunrise in October, so early miles can be genuinely cold before the climbing warms you up. Keep sodium in the 300 to 700 mg per liter range, and since this is a cupless event, make sure your hydration setup lets you refill efficiently at each aid station without wasting time at the cutoffs. The mandatory jacket and space blanket exist for a reason on a course this exposed at elevation.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and nearly 8,000 feet of Missoula climbing 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, this exact multi-summit City to Sky profile, and your projected splits through each cutoff aid station. Summit Line reads your real training, builds a plan for nearly 8,000 feet of front-country climbing, and rehearses your fueling so race day is something you execute, not guess at.

Start free →Explore the demo

City to Sky Ultra FAQ

How hard is the City to Sky 50K?

City to Sky's own course page describes the 50K as "just under 33 miles... yes, that's closer to 53K" with nearly 8,000 feet of elevation gain, and that honesty about the distance running long tells you what kind of day this is. The course climbs Mount Sentinel, Pengelly Ridge, the Smokejumper Trail, University Ridge, House of Sky Trail, and Mitten Mountain before descending past Mount Dean Stone back to Missoula's University District. Multiple real summits, not one defining climb, and a course that runs meaningfully longer than its nominal distance, make this one of the tougher point-to-point 50Ks in the region.

How much climbing is in the City to Sky Ultra?

The 50K climbs nearly 8,000 feet over its roughly 33 miles, spread across several named summits and ridgelines rather than one long ascent: Mount Sentinel and Pengelly Ridge early, the Smokejumper Trail and University Ridge to the beacon around the halfway point, then the Sam Braxton National Recreation Trail, Deer Creek ridge, the House of Sky Trail, Mitten Mountain, and Mount Dean Stone in the second half. The 25K runs the back half of that course and climbs about 2,700 feet, still a serious day, just without the Mount Sentinel opener.

How should I fuel for City to Sky?

The 50K starts before sunrise at 7:00 AM in October, so plan for cold early miles that warm up as the day goes on and the climbing adds up. Crewing is not allowed anywhere on course, and this is a cupless event, so you fill your own hydration devices at aid stations stocked with GU gels, GU hydration drink, pickles, chips, fruit, and Oreos. Aim for roughly 60 to 90 grams of carbohydrate per hour and sodium in the 300 to 700 mg per liter range, and lean on your drop bag (transported to the halfway aid station at Pattee Canyon Picnic Area) to reset your supply partway through. Build your numbers with the free ultra fueling calculator before race day.

What are the cutoff times for City to Sky?

The 50K course is open from 7:00 AM to 6:00 PM, an 11-hour window, but three intermediate aid station cutoffs matter more day to day: Pattee Canyon Picnic Area (mile 15.5) by 12:45 PM, Skyline Ridge Trailhead (mile 21.0) by 2:45 PM, and Barmeyer Overlook (mile 29.0) by 4:45 PM. Miss any of these and you will be pulled from the course by aid station volunteers or course marshals, so pace against these checkpoints rather than only the overall 6:00 PM close.

What mandatory gear do I need for City to Sky?

The 50K requires runners to carry a headlamp (the start is before sunrise), a waterproof and breathable hooded jacket, a space blanket, and 32 oz of water carrying capacity for the entire race. Recommended extras include a hat or neck gaiter, gloves, an extra top layer, rain pants, sunscreen, a whistle, your phone, reserve food, and bear spray. Bring your full pack to bib pickup, since organizers check mandatory gear before you can start.

Is City to Sky a good first 50K?

Only if you come in with real vertical training. Nearly 8,000 feet of gain over a course that runs closer to 53K than 50K, mandatory gear you have to carry the whole way, no crewing, and firm intermediate cutoffs all point to a course built for experienced mountain ultrarunners rather than a first-timer. If you have finished a flatter 50K and want to step up to real Montana vert, City to Sky is a strong next test, just respect the mandatory gear list and the aid station cutoffs and do not treat this as an easy first ultra.

Link this guide

Race directors and clubs: link or embed this guide anywhere. It stays current.

HTML link
<a href="https://runsummitline.com/guides/city-to-sky-ultra">The City to Sky Ultra course guide</a>

This guide is independent and for planning only. The course details, dates, cutoffs, and mandatory gear 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.