Marathon Race Information

Race Info

Founders Susan & Brian Pendleton

Tunnel Marathon – 2026 Course Information

The Tunnel Marathon offers one of the fastest marathon experiences in the country. Known for its consistent downhill grade and low starting elevation, this course is designed for speed — making it an ideal opportunity to set a Personal Record and earn a Boston Qualification.

2026 Alternate Course Notice

Due to severe storm damage to sections of the original Tunnel Marathon course, the 2026 event will follow an alternate, fully permitted route.

The 2026 course will:

  • Remain fast and scenic

  • Features approximately 1,000 feet of net elevation drop

  • Be a USATF-certified Boston Qualifier (certification to be finalized once snow levels permit course measurement in May)

While the route differs from the original North Bend finish course, the experience remains true to the spirit of the Tunnel Marathon — beautiful mountain views, waterfalls, crisp Washington air, and the unforgettable run through the historic Snoqualmie Tunnel.

The original Tunnel Marathon course has ranked in the Top 10 nationwide for Boston Qualifiers (Runner’s World and Race Raves) and has historically helped more than 42% of participants earn a BQ. Founded in 2007 by Washington resident Brian Pendleton, the event continues to be a runner's favorite year after year.

You can expect the same professional organization, safety standards, and fast course design in 2026.

CALTOPO MARATHON MAP HERE

Race Start

The race begins at Hyak Sno-Park Trailhead on the John Wayne Pioneer Trail, just east of Snoqualmie Pass.

  • Runners complete an out-and-back segment heading east for 6.55 miles to the turnaround

  • Participants return to Hyak at mile 13.1

  • After the halfway point, runners enter the Snoqualmie Tunnel

A headlamp or personal light source is strongly recommended for the tunnel section. Approximately 50 yards inside, you will see the small pinpoint of daylight ahead — the iconic “Light at the End of the Tunnel” more than two miles away.


Race Finish

After exiting the tunnel, runners continue approximately 10.5 miles along gentle downhill grades through second-growth forest to the finish at Garcia Trailhead. The route remains smooth, fast, and scenic all the way to the finish.

Runners will receive their medal, hydration, drop bags, and make their way to the shuttle buses at the bottom of FS #9020. All runners will be shuttled back to the start to enjoy the awesome post-race festivities!

Absolutely NO PARKING/NO SPECTATORS at the finish location. 

Course Surface

The marathon course follows a former railway bed consisting primarily of packed gravel. Shoes are a personal preference.

  • Some runners comfortably wear traditional road racing shoes

  • Some runners prefer light trail shoes

Course Support & Rules

The Tunnel Marathon follows USATF rules.

  • Outside of aid station support (friends, bicycles, private aid, etc.) is strictly prohibited.

  • Any runner receiving non-official assistance will be disqualified.

  • Due to limited road access, runners may wish to carry a small handheld bottle, especially in warm conditions.

  • Carrying a cell phone is strongly recommended.

In addition to aid stations, the course is supported by:

  • Search & Rescue personnel

  • On-course volunteers

  • Medical staff at the finish line. 

  • Failure to follow the rules will result in disqualification.

Aid Stations

There are 9 aid stations located approximately every 2.5 miles.

At most aid stations:

  • Water

  • Tailwind electrolyte drink

  • First aid supplies

Honey Stinger Energy Gels are available at three designated stations: 5, 7, and 9.

Trash receptacles are located at and shortly after each aid station.

Aid Station Locations

  • Mile 2.5 – Aid #1 (Water only, first aid) – outbound

  • Mile 5.0 – Aid #2 (Water, electrolyte, first aid) – outbound

  • Mile 8.0 – Aid #3 (Water, electrolyte, first aid) – after turnaround

  • Mile 10.5 – Aid #4 (Water, electrolyte, first aid) – after turnaround

  • Mile 13.2 – Hyak (Water, electrolyte, Honey Stinger gels, first aid, Ham radio unit)

  • Mile 15.6 – Tunnel Exit (Water, electrolyte, first aid, headlamp drop)

  • Mile 18.1 – Humpback (Water, electrolyte, Honey Stinger gels, first aid)

  • Mile 21.1 – Bandera (Water, electrolyte, first aid)

  • Mile 23.5 – Rock Creek (Water, electrolyte, Honey Stinger gels, first aid, Ham radio unit)

Restrooms

  • Permanent restrooms at the start (Hyak Sno-Park)

  • Porta-johns at the finish

  • Additional restrooms are located on the course. TBD

FAQ

Is there a time limit?

Official timing and on-course support are provided for 6 hours.

An early start option is available one hour before the official start for runners who anticipate needing additional time.

  • You must select the early start option during registration.

  • Early starters who finish under 5 hours will be disqualified.

  • Please check in with the timer at the start line on race morning.

Is the course paved or trail?

The course is primarily packed gravel on a historic railway grade. It is smooth, stable, and designed for speed.