SISU 100

100 Miles. Six Trails. Endless Possibilities.

SISU 100 PNW is the Pacific Northwest's choose-your-own-adventure ultramarathon.

Instead of following one marked course from start to finish, you'll build your own 100-mile route from six unique mountain trails based from Camp Sheppard, just outside Mount Rainier National Park.

Every runner completes the same six trails, but the order is entirely up to you.

Some runners will knock out the biggest climbs early. Others will save them for daylight and spend the night on shorter routes. Every decision becomes part of your strategy.

There is no perfect plan. That's the adventure.

HOW IT WORKS

Your race begins with six unique trail routes ranging from approximately 3 to 19 miles.

You must complete each trail once before repeating any of them. After finishing all six trails, you'll have covered approximately 57.5 miles.

From there, choose whichever trails you want to repeat until you reach 100 miles.

You may repeat a trail, but you cannot complete the same trail more than twice in a row.

Reach 100 miles before the cutoff and you'll earn the SISU 100 belt buckle.

THE COURSE

The SISU 100 consists of six marked out-and-back mountain trails based from Camp Sheppard.

Trail distances range from approximately 3 to 19 miles and include everything from runnable forest roads to steep mountain climbs, waterfalls, ridgelines, and sweeping alpine views.

There is no assigned order.

You decide where you go, when you go there, and how you build your race.

Every route returns to basecamp, making every decision part of your strategy.

RACE STRATEGY

Every runner arrives with a different plan.

Some 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.

Unlike the SISU 24, the trails never change in value.

The way you combine them is entirely up to you.

BASECAMP

Camp Sheppard is your home for the weekend.

Unlike many 100-mile races, you'll return to basecamp throughout the event. Your tent, food, crew, extra gear, showers, flushing toilets, and medical support are all waiting for you between efforts.

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

SISU 100 is a self-supported ultramarathon.

Runners are responsible for bringing the food, nutrition, hydration, and gear they'll need throughout the weekend.

We'll have water, electrolytes, snacks, and a selection of common aid station items available at HQ, but you should plan to be self-sufficient once you leave camp.

There are no aid stations on the trails.

WEEKEND SCHEDULE

Friday

Camp opens
Check-in and packet pickup
Mandatory racer briefing
SISU 100 begins

Saturday

Race continues

Sunday

Race concludes
Awards and buckle presentation follow after results are verified

AWARDS

Every official SISU 100 finisher receives the custom SISU 100 belt buckle.

The buckle is earned by completing 100 miles before the official cutoff.

There are no shortcuts.

There are no consolation buckles.

One hundred miles earns the buckle.

REQUIRED GEAR

Required gear includes:

• Headlamp with extra batteries


• Hydration pack or bottles


• Water filtration or purification method


• Food and nutrition for the duration of the event


• Glowsticks or visibility markers


• Bear bell


• Phone, GPS watch, or navigation device


• Backup battery or charger


• Weather-appropriate clothing

A complete racer guide with final gear requirements and race weekend information will be sent to all registered participants before the event.

WHAT PEOPLE ARE SAYING

“I discovered SISU 100 PNW in 2023, and it quickly became my favorite race. It changed my life by giving me a purpose to train for throughout the year. The breathtaking scenery, challenging terrain, and freedom to create your own route make it a truly unique experience.

What truly sets Sisu apart, however, is its incredible sense of community. Returning to basecamp after each loop for encouragement, refreshments, and camaraderie makes the event even more special. It creates opportunities to connect with fellow runners, volunteers, and crew members throughout the race, fostering a welcoming and supportive atmosphere.

SISU 100 PNW is more than just a race—it’s a community, an adventure, and a place where you truly feel like you belong. I look forward to coming back year after year.”

— Elke Albright

COURSE RULES

The race consists of six marked trail routes.

You must complete every trail once before repeating any route.

After completing all six trails, you may repeat routes until you reach 100 miles.

You may not complete the same trail more than twice in a row.

You must check in and out at HQ before and after every trail.

Please remain on marked trails at all times. Once you begin a trail, it must be completed in its entirety. Any attempt to shortcut the course or intentionally bypass the route will result in disqualification.

LOOKING FOR SISU 24 PNW?

Looking for the original choose-your-own-adventure experience with side quests, points, camping, and team competition?

Looking for the original choose-your-own-adventure experience with side quests, points, camping, and team competition?

Click here to visit the SISU 24 PNW registration page.

REFUND POLICY

Registrations canceled within 45 days of purchase are eligible for a 70% refund.

Registrations may transfer to the following year for $50.

If circumstances beyond our control require the event to be postponed, registrations will automatically transfer to the new event date.

If you have any questions before registering, don't hesitate to reach out. We'd love to have you join us for an unforgettable weekend in the mountains.

Event's current local time: 1:45 PM PT