SISU 100 PNW
100 Miles. Six Trails. Endless Possibilities.
The Pacific Northwest’s
Choose Your Own Adventure Ultramarathon
June 25-27, 2027
Camp Sheppard, Enumclaw, WA
The SISU 100 Format
A 100-mile ultramarathon unlike any other.
Instead of following one marked course from start to finish, you’ll choose your own route from six different trails. Complete each trail once, then decide how you want to build the rest of your race.
Some runners will knock out the biggest climbs early. Others will save them for daylight and spend the night on shorter loops. Every decision becomes part of your strategy.
Everyone runs the same trails. No two races look exactly alike.
Distance
100 Miles
Format
Choose Your Own Adventure
Trails
6 Unique Routes
Cutoff
36 Hours
Start
Friday Evening
Basecamp
Camp Sheppard
Support
Self-Supported Nutrition
Camping
Included
Crew
Welcome
Award
Custom SISU 100 Belt Buckle
How It Works
1. Complete Every Trail
Your race begins with six unique trail routes ranging from roughly 3 to 19 miles. You must complete each trail once before repeating any of them.
2. Build Your Strategy
After you’ve completed all six trails, you’ll have covered approximately 57.5 miles. From there, you choose which trails to repeat until you reach 100 miles.
3. Mix It Up
You may repeat a trail, but you can’t complete the same trail more than twice in a row. This keeps the race strategic and encourages runners to experience the full course.
4. Earn Your Buckle
Reach 100 miles before the cutoff and you’ll earn the SISU 100 belt buckle.
Explore the Six Trails
Every runner completes the same six trails. The order is up to you.
Each trail has its own personality. Some are fast. Some are relentless. Some reward patience. Others tempt you into going out too hard.
Study the routes, compare the stats, and start building your strategy before race day.
(select a trail to learn more)
The Course
Six trails.
Varying from 3 to 19 miles roundtrip.
There is no assigned order. You decide where you go and when you go there.
This is 100% choose your own adventure.
THERE IS NO PERFECT STRATEGY
Every runner arrives with a different plan.
Some runners attack the biggest climbs while their legs are fresh. Others spread the elevation across the weekend.
Some chase efficiency, while others simply run the trails they enjoy most.
SISU 100 rewards thoughtful pacing as much as fitness. The six trails never change, but the way you combine them is entirely up to you.
Basecamp
🏕 Campsites
🚿 Hot Showers
🚽 Flush Toilets
🍳 Crew Friendly
💧 Water
⛑ Medical
Unlike many 100-mile races, you’ll return to Camp Sheppard throughout the weekend.
Your tent, food, extra gear, crew, showers, and medical support are all waiting for you between efforts. You get the challenge of a mountain ultramarathon without having to carry everything on your back or rely on remote aid stations.
Whether you’re grabbing fresh socks, eating a hot meal, or catching a few minutes of sleep, basecamp becomes part of your race strategy.
Self-Supported by Design
SISU 100 is a self-supported ultramarathon. Runners are responsible for bringing the food, nutrition, and gear they’ll need throughout the weekend.
Because every trail returns to Camp Sheppard, your personal aid station is never far away. Keep your favorite nutrition, extra shoes, dry clothes, lighting, and anything else you need waiting for you at basecamp.
We’ll have water, electrolytes, snacks, and a selection of common aid station items available throughout the event, but you should plan to be self-sufficient when it comes to fueling your race.
A Weekend in the Mountains
Frequently Asked Questions
Are dogs allowed at Camp Sheppard?
Dogs are not allowed within Camp Sheppard. Dogs are allowed on the trails outside of camp and also at Buck Creek campground that is near Camp Sheppard.
What amenities are on site?
Running water, showers and bathrooms in camp. Do not expect to have reliable cell service and there is no wifi on site. Cabins are available for rent if you don’t want to camp in a tent.
When can I show up?
Feel free to come in any time Friday afternoon. Race starts at 9PM on Friday.
What do I do when I arrive?
Park in the designated lot then check-in at the gate, we will have a volunteer there to provide you with your parking pass if needed. If you have not paid for parking this is when you’ll pay, have cash ready (Northwest Forest Service or America the Beautiful passes can be used in lieu of a purchased pass).
Once you’ve checked in at the gate, you may grab a wheelbarrow to bring your gear up to the campsite. No vehicles are allowed onto the campgrounds except for RVs and towing vehicles that have reserved an RV spot.
Check in at HQ before 8pm Friday to get your bib and race swag.
When does the race start?
The SISU 100 race starts at 9PM on Friday.
How can I get more info?
Email the race directors at sidequestadventuresorg@gmail.com for questions ahead of the event weekend. On race weekend we will have a pre-race meeting, plan to attend Friday night at 8:30PM.
How can I help?
We are so grateful for the volunteers that we get! Volunteers are always needed for course marking (Thurs/Fri) and course takedown (Sun/Mon). Additionally, if any family/friends/crew want to take a shift at HQ helping moderate side quests during the race, please let us know!