Overview
The Three Sisters Skyline 50K is a trail runner’s dream—a rugged and beautiful ultra that immerses you in the heart of the Oregon Cascades. Starting with a long climb through ponderosa pines, you’ll crest near the Three Sisters Wilderness, where the jagged volcanic peaks dominate the skyline. From there, the course winds through alpine meadows, regrowth from the 2012 fire, and streams that sparkle under the big mountain backdrop.
This race balances effort and reward. With 3,700ft of climbing and 4,700ft of descent, it’s demanding but incredibly runnable, making for fast times and unforgettable experiences. Add in three well-stocked aid stations, incredible community support, and a post-race celebration in Sisters, and you’ve got a 50K worth every step.
Saturday, September 20, 2025
Registration
Opens
Mar 1, 2025, 12:00 AM
Closes
Sep 17, 2025, 11:59 PM
Registration Fee
$155

UTMB Index Qualifier
Official race details:
Course
Distance:
50
K
Course type:
Unknown
Elevation gain:
▲
3,700ft
Elevation loss:
▼
4,700ft
Max altitude:
6,800ft
Start time:
Sep 20, 2025
8:00 AM
Cutoff time:
3:30PM
Course Description
The 50K course opens with 9.7 miles of steady climbing, gaining about 2,300ft before reaching the first aid station just outside the Three Sisters Wilderness. From there, you’ll traverse a mix of meadows, forest, and flowy singletrack before descending hard toward the finish line in Sisters. With 95% of the course on singletrack, runners can expect both technical sections and smooth cruising terrain.
Logistics
Nearest airports are:
Redmond, Oregon (30 minutes)
Bend, Oregon (30 minutes)
Salem, Oregon (2 hours)
Portland, Oregon (3 hours)
Driving Directions
Parking
Parking is at Village Green Park in Sisters. There is no parking at the start lines; shuttles are mandatory.
Lodging
Sisters, Oregon – Official lodging partner is Left Coast Lodge with a two-night minimum.
Bend, Oregon – Numerous hotels and rentals available.
Redmond, Oregon – Additional accommodations available.
Aid Stations
The 50K has three fully stocked aid stations with water, electrolytes, and trail snacks. Crew is allowed only at AS2. The Half Marathon has one fully stocked aid station at mile 7.1.
Race Requirements
The 50K is recommended for runners with prior trail race experience. The Half Marathon is accessible to newer trail runners but does require fitness to maintain a 3MPH pace.
Trail Work
Mandatory Gear
No mandatory gear list is enforced. Runners should be prepared for variable mountain weather conditions and are encouraged to carry hydration, nutrition, and layers.
Policies
Cancelations & Deferrals
Refunds & Credits
No transfers to other runners. No exceptions.
Cancel more than 30 days before race day → you’ll receive 50% credit toward the same event the following year.
Cancel within 30 days of race day → no credit, no refund, no transfer. Please don’t ask—we keep this policy consistent for everyone.
How to Cancel for Race Credit
You must cancel 30+ days before the event to receive 50% credit.
Log into your Ultrasignup account.
Go to your registration history.
Cancel your entry.
That’s it—your spot will be released, and 50% credit will automatically roll to next year’s event.
Important: We cannot make exceptions, even for medical reasons or injuries.
Pre-Purchased Items
Gear like shirts, hats, pint glasses, or other add-ons must be picked up in person during race weekend check-in. Anything not collected will not be shipped.
Switching Distances
You can move up or down in distance before race day only.
If the distance you want is sold out and has a waitlist, you’ll need to join the waitlist—we can’t move you ahead of others.
Dropping down? No refunds.
Moving up? You’ll need to pay the difference before being added.
To switch, please email the race directors.
Race Cancellation
If we are forced to cancel an event and it cannot reasonably be rescheduled, there will be no refunds, no credits, no rollovers.
Other Notes
Personal checks are not accepted.
Reserved spots: Alpine Running holds a number of entries for sponsors and partners, outside of regular registration.
Pregnancy Deferral
We proudly offer a deferral for runners who are pregnant.
Eligibility: Any registered runner who is pregnant or becomes pregnant after registering.
Steps:
Submit a written Pregnancy Entry Deferral request to the Race Director before race day.
Provide confirmation of pregnancy or proof of birth from a physician, midwife, or other medical professional.
Your entry will be deferred for 1 year.
Dogs
Dogs are not allowed on course or at the race start and finish.
Crew, Pacers & Spectators
Crew access is only permitted at Aid Station 2, and runners will be disqualified if crew are found at any other point.
Visitors are welcome at the start and finish at Village Green Park. Please follow parking and shuttle policies to avoid congestion.
Volunteers
Every race has a secret sauce—and it’s not the aid station snacks. It’s the volunteers. Without their energy, smiles, and hard work, none of these events would happen.
Volunteering is a chance to give back to the trail running community, cheer on runners from a different perspective, and maybe even scope out what racing feels like before signing up yourself. Whatever brings you to the volunteer crew, we see you as partners—and we celebrate you like the trail heroes you are.
What You’ll Get as a Volunteer
At Alpine Running races, volunteers receive:
A quality race t-shirt (wear it with pride!)
A post-race meal and beverage—because good food tastes even better after trail magic
Race credit toward a future Alpine Running event
A Few Ground Rules
To keep things fair and sustainable, here’s how volunteer benefits work:
Credits expire within one year of being issued.
Credits don’t apply to volunteers associated with race sponsors.*
Credits and race-day perks are for folks who sign up ahead of time and fill their assigned role.
Credits can only be redeemed online during registration.
Alpine Running reserves the right to adjust credits, restrictions, or benefits if needed.
*If you’re part of a sponsor team, reach out to Alpine Running to learn more about your special perks!
Charity & Beneficiary
The race supports the Sisters Trail Alliance, a nonprofit dedicated to planning, building, and maintaining non-motorized trails in and around Sisters, Oregon. More information at https://sisterstrails.org