Kåduka
Sun Mountain 20K
Sun Mountain 20K
Rainshadow Running
Rainshadow Running
Sun Mountain 20K
All Races
Hard
Sun Mountain 20K

Sun Mountain 20K

20KSaturday, May 16, 2026Washington

Sunny miles in the North Cascades

Overview

Wake up to crisp mountain air, hop the sunrise shuttle, and run straight into a sea of balsamroot and lupine on the sunny side of the North Cascades. Sun Mountain’s trails roll through ponderosa forest and open ridgelines with postcard views of snow-capped peaks and the Methow River far below. After your victory lap at Chickadee Trailhead, shuttle back to Big Twin Lake for live music, local beer, and endless slices of wood-fired pizza, because every good run deserves an even better party.

Key Highlights

  • Located on the edge of the Chelan Sawtooth Wilderness, overlooking the Methow River Valley

  • Trails are mostly smooth and runnable with moderate climbs

  • Spectacular scenery with wildflower meadows and distant Cascade peaks

UTMB Index: trueTrail Sisters ApprovedCuplessVegan Friendly

This year’s event took place on

Saturday, May 16, 2026

Start: 5:00 AM

RegistrationRegister
Closes:May 12, 2026
Registration Fee:
230$180,
155$150
Trail Sisters
Trail Sisters Approved
UTMB Index
UTMB Qualifier
Official race details:Sun Mountain 20K
0 participant limit

Course

Elevation Gain3,100 ft
Elevation Loss3,100 ft
Max Altitude2,620 ft
Cutoff Time16HR, 14HR, 6.5

All four routes start and finish at Chickadee Trailhead, weaving through the Sun Mountain network on well-groomed singletrack and doubletrack. Expect flowing climbs, smooth descents, and just enough rocky spice to keep you awake. Wildflower meadows burst with color in May, and distant spires of the Chelan-Sawtooth Wilderness line the horizon. New for 2025, every distance is 100 percent dirt; no pavement, no problem.

Distance Highlights

  • 50M follows an extended figure-eight that tags high ridges twice for maximum panoramas and opening loop before diving into aspen groves and sage-covered hillsides

  • 20M threads the best ridgelines of the lower network

  • 25K delivers a punchy sampler of Sun Mountain’s greatest hits

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Cutoff Details

Start Time /

  • 50M, start at 5:00AM

  • 50K Wave 1, start at 6:00AM

  • 50K Wave 2, start at 7:00AM

  • 20M, start at 7:00AM

  • 25K Wave 1, start at 8:00AM

  • 25K Wave 2, start at 9:00AM

Cutoff Time /

  • 50M, 16HR overall, cutoff at 9:00PM

  • 50K, 14HR overall, cutoff at 9:00PM

  • 20M, 6.5HR overall, cutoff at 1:30PM

  • 25K, 5.5HR overall, cutoff at 1:30PM

Aid Stations

Stations are approximately every six to ten miles. Volunteers track bib numbers and enforce listed cutoff times to keep the event on schedule.

What's Included

Standard spread of water, Gnarly electrolytes, soda, fruit, PB&J, Oreos, candy, chips. Vegan-friendly. 🌱 This is a cupless race so bring your own flask/cup. First-aid & period products available. Drop bags allowed at every aid station.

Logistics

Schedule

Friday

2:00PM → Camping check-in opens at Big Twin Lake Resort
10:00PM → Camping check-in closes

Saturday

3:30AM → Runner check-in opens (50M, 50K)
4:15AM → Shuttle departs with 50M runners
5:00AM → 50M start
5:15AM → Shuttle departs with 50K Wave 1
6:00AM → 50K Wave 1 start
6:15AM → Shuttle departs with 50K Wave 2
7:00AM → 50K Wave 2 start
9:15AM → Crew shuttles begin every thirty minutes
9:00PM → Finish line closes

Sunday

5:30AM → Runner check-in opens (20M, 25K)
6:15AM → Shuttle departs with 20M runners
7:00AM → 20M start
7:15AM → Shuttle departs with 25K Wave 1
8:00AM → 25K Wave 1 start
8:15AM → Shuttle departs with 25K Wave 2
9:00AM → 25K Wave 2 start
9:15AM → Crew shuttles begin every thirty minutes
1:30PM → Finish line closes

Monday

12:00PM → All campers depart Big Twin Lake Resort

Bib Pickup

Packet pick-up happens during runner check-in at Big Twin Lake Resort on race mornings; please bring photo ID and be ready to board your assigned shuttle.

Drop Bags

One labeled drop bag per aid-station location (except at the Ridge) plus an optional finish-line bag may be left on tarps at check-in. Bags return to Big Twin after each station closes; unclaimed bags are held twenty-four hours before donation.

Crew & Pacers

Crew and spectators must park at Big Twin Lake Resort and purchase a $10 shuttle pass (kids fourteen and under ride free). No private vehicles or drop-offs are allowed at Chickadee Trailhead or aid stations. Earbuds and headphone are not permitted for pacers and on-course crew.

Mandatory shuttle service for runners and crew ($10 per adult for crew; kids 14 and under free).

Volunteers

Rainshadow Running thrives on volunteer magic. Shifts range from early-morning check-in to full-day aid-station gigs. Perks include free food, finish-line drinks, and credit toward a future Rainshadow race. Sign up by emailing info@rainshadowrunning.com.

Swag & Medals

Finishers receive a handcrafted wooden medallion, professional race photos, bottomless wood-fired pizza, and a pint of Old Schoolhouse beer. Optional race shirts and extra meal tickets are available during registration.

What's Included

  • Scenic, well-marked course through Methow Valley’s premier trail system

  • Shuttle transportation for runners and spectators

  • Fully stocked aid stations with water, Gnarly electrolytes, PB&J, fruit, chips, cookies, candy, and GU gels

  • Drop bag service at most aid stations and finish

  • Post-race celebration with wood-fired pizza, local beer (Old Schoolhouse Brewery), music, and community at Big Twin Lake Resort

Getting There

Passes & Permits

No passes or permits required.

Parking

All participants and crew park at Big Twin Lake Resort. No parking, drop-offs, or pickups are allowed at Chickadee Trailhead or along Sun Mountain roads. Day parking is included with race entry; crew shuttle passes are ten dollars per adult.

All parking at Big Twin Lake Resort; no parking at Chickadee Trailhead


Lodging

Big Twin Lake Resort offers min 3-night race-weekend packages: tent sites from $45 and full-hookup RV sites from $145. Additional options in Winthrop include Sun Mountain Lodge, North Cascades Mountain Hostel, Methow River Lodge, River’s Edge Resort, and numerous Airbnb rentals. Book early! May is busy in this region.

Winthrop, washington

Requirements

Complete 50-mile trail race between the year prior to the race, OR any 100-mile trail race (date doesn’t matter). If you don’t complete the requirement, you cannot race and there are no refunds. You can register before completing the requirement, but you must finish it a month before the race.

Mandatory Gear

Recommended, but not mandatory, gear includes: hydration system holding at least one liter, weather-ready layers, a course map or GPX file on watch ⁄ phone, and a portable power bank.


Policies

Cancelations & Deferrals

Entries are not transferable.

Race Policies

One-earbud headphone use is permitted for runners only.

Charity & Beneficiary

A portion of every entry supports Methow Trails for year-round maintenance and trail building in the valley.


Land Acknowledgement

We acknowledge that the race runs on the ancestral homelands of the sp̓aƛ̓mul̓əxʷəxʷ (Methow), Syilx (Okanagan), Nłeʔkepmx Tmíxʷ (Nlaka’pamux), the Confederated Tribes of the Colville Reservation, and the Cayuse, Umatilla, and Walla Walla peoples, who have stewarded these lands since time immemorial. Race entry fees are waived for tribal members; email info@rainshadowrunning.com for details.

About Rainshadow Running

Rainshadow Running

Rainshadow Running is known for hosting some of the most scenic, challenging, and well-loved trail races in the Pacific Northwest. Since 2006, we've brought runners together on rugged mountain trails, coastal bluffs, and remote desert ridges, places that inspire awe and demand grit.

Our races are more than just miles; they’re celebrations of community, nature, and the wild beauty of the land. Whether you're chasing a PR or just here for the post-race party with wood-fired pizza and bluegrass music, you're part of the Rainshadow family.

View all Rainshadow Running races on Kåduka →
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Disclaimer

We make every effort to provide accurate and up-to-date information on Kåduka, but details may change. Please always confirm the latest information on the official race website. See something that needs correcting? Send us a note at feedback@kaduka.app