⏵ Course guide · Arizona Insomniac night race
Stunner is Aravaipa's July Insomniac race, a flat and fast loop at the base of Pass Mountain in Usery Mountain Regional Park, run entirely after dark starting at 7:30 PM in the height of Arizona summer. The terrain will not slow you down, the heat will. I will walk you through the loop first, then give you a pacing and fueling plan built for a hot summer night ultra, with free calculators along the way to dial in your own numbers.
These facts come from the official Aravaipa race page. Check the current date, distances, cutoffs, and aid in the race-day details before you commit. Race logistics change year to year.
Every distance runs the same loop through the Chain Fruit, Lost Sheep, Channel, and Blevins Trails at the base of Pass Mountain, you just do more laps for a longer race. The 50K is four laps, the 25K two. This is one of the flattest, fastest courses in the Insomniac series.
With only about 1,389 feet of gain over 31 miles, Stunner rewards runners who can hold a strong, consistent pace. That same flatness makes it tempting to run the early loops far faster than you can sustain across four full laps in the heat, which is the most common way runners undo themselves here.
The course winds through Chain Fruit cholla at the base of Pass Mountain, a distinctive and genuinely spiny cactus. It adds character to the course and a real reason to stay attentive on narrower sections, especially once your headlamp beam is all you have to judge the trail edge.
Stunner runs cupless to cut down on race-day waste, so come prepared with a bottle or reusable cup, or plan to buy one on site. It is a small detail but worth sorting out before you are standing at an aid station at midnight without a way to take on fluid.
With minimal vert and a 10-hour cutoff, the pacing question at Stunner is almost entirely about heat management, not terrain.
Flat, fast courses invite an aggressive first loop, and July heat punishes exactly that. Set a pace you know you can hold across all four laps, using a grade-adjusted target so effort stays honest even on a course with little elevation to slow you down naturally.
Even on flat terrain, a vert-aware finish prediction from your own early loop splits beats a generic flat-course guess, since it accounts for how heat is actually affecting your pace that night. Check it against the 5:30 AM cutoff after loop one, while you still have three loops to adjust.
⏵ Free tools to pace this course
A 7:30 PM start in mid-July does not buy much relief from the heat right away. Plan your fluid and sodium like the early loops are the hardest part of the race, because they usually are.
Aim for roughly 60 to 90 grams of carbohydrate an hour. The flat, fast terrain makes it easier than most ultras to eat and drink while moving, so use that to stay on schedule rather than falling behind on intake during technical sections.
Push sodium toward 500 to 700 mg per liter of fluid, especially through the first two loops while the desert is still radiating the day's heat. Grab ice at every aid station early on. More than the trail or the vert, fluid and salt discipline in the first few hours decides how your night at Stunner goes.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a peak-summer Arizona night 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 Usery Mountain loop profile, and your projected splits. Summit Line reads your real training, builds a plan for summer heat and night running, and rehearses your fueling so race night is something you execute, not guess at.
Stunner is billed as flat and fast, and the numbers back that up: about 1,389 feet of gain over four laps for the full 50K, using the Chain Fruit, Lost Sheep, Channel, and Blevins Trails at the base of Pass Mountain. The real difficulty is timing and heat. This is Aravaipa's July entry in the Insomniac series, run in the peak of Arizona summer, so even a 7:30 PM start means racing through genuinely hot early loops before the desert cools. If you manage the heat well, the terrain itself will not be what stops you.
Not much by ultra standards. The 50K, run as four laps, carries about 1,389 feet of total gain with a max elevation of 1,965 feet, making this one of the flatter courses in the Insomniac series. Aravaipa describes it as a flat and fast course, so expect your legs to feel less beat up than a typical mountain ultra, even at the full distance.
Stunner is the fourth race in Aravaipa's Summer Insomniac Night Series, and running after dark in July is close to a necessity in the Phoenix metro, where daytime highs regularly exceed 105°F. Starting at 7:30 PM near sunset still means racing through real heat on the early loops, but it beats the alternative of a daytime start entirely. A headlamp is required for the full course.
50K runners must leave for their final (fourth) loop by 3:30 AM, with an overall cutoff of 5:30 AM, 10 hours after the 7:30 PM start. Given the flat, fast nature of the course, that cutoff leaves real margin for most prepared runners, as long as the July heat is managed early.
In addition to a fully stocked aid station at the start/finish, there is one full remote aid station, Levee Aid, positioned so 50K runners pass some form of aid roughly every 2.2 to 5.6 miles across all four loops. Stations carry water, ice, electrolyte drink, salty and sweet snacks, fruit, PB&J, bean rollups, and hot food later in the night. This is a cupless race, so bring a reusable cup or bottle, or buy one on site.
The flat profile and looped format make it one of the more approachable Insomniac races for a first ultra, with modest climbing, frequent aid, and a 10-hour cutoff that leaves real room. The one thing to respect fully is the July Arizona heat: even with a 7:30 PM start, the opening loops can be dangerously warm, so train with hot-weather runs, know your sweat rate, and do not treat the night start as a heat pass.
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<a href="https://runsummitline.com/guides/stunner-night-runs">The Stunner Night Runs course guide</a>This guide is independent and for planning only. The course details, dates, distances, cutoffs, and aid 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.