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About RaceIndexOur methodologyData coverageCyclingTriathlon
  • Ultramarathon
  • 50 km
  • Bellingham
  • Event weekend starts
  • Sold out

Chuckanut 50k Ultramarathon

This race edition

Race date
Date not confirmed for this distance
Race timezone
Timezone not confirmed
Edition status
Status not confirmed

Entry options

2027 edition

Entry options are not yet confirmed for this edition. Check the organiser before making plans.

Modelled energy-cost change 8.6% versus flat · net elevation -5 m

View verified GPS mapOfficial event website ↗
Data current as of

Decision summary

Chuckanut 50k Ultramarathon at a glance

Route ascent
1,416 m

Lower than 69% of comparable mapped races

Cut-off average pace
9:36/km

8:00:00 total limit divided by distance. Check gun/chip timing and intermediate limits; allow time for stops.

Typical conditions
85/100

Historical race-date favourability, not a forecast

Evidence depth
41 verified facts

Stored GPS route

Quick answers

What runners ask first

Chuckanut 50k Ultramarathon route map

raceindex.org has a GPS course file for Chuckanut 50k Ultramarathon, so runners can inspect the route line on the map. Elevation charts and ascent figures appear only when that file includes usable elevation data.

How hilly is the Chuckanut 50k Ultramarathon?

The Chuckanut 50k Ultramarathon route has 1,416 m of ascent, 1,422 m of descent and an estimated 8.6% grade-adjusted pace penalty versus a flat route.

Where does the Chuckanut 50k Ultramarathon route go?

The Chuckanut 50k Ultramarathon route starts at Fairhaven Park, 107 N Chuckanut Drive, Bellingham, WA 98225 and finishes at Fairhaven Park, 107 N Chuckanut Drive, Bellingham, WA 98225. Underfoot, expect 100% un-paved trails. It passes Interurban Trail, Chuckanut Mountain Ridge and Fairhaven Park. One of the largest and most competitive 50k trail races in the USA.

What should runners know on race day for the Chuckanut 50k Ultramarathon?

5.

Race character

Scenery

  • Mountain
  • City
  • Countryside
  • Forest
  • Lakeside
  • Coastal

Atmosphere

  • Wilderness
  • Competitive
  • Destination

Terrain

  • Trail
  • Gravel
Elevation character
Mountainous
Technicality
Technical
Net elevation
31 m

Entry, logistics and records

Records and field

Men's course record
3:33:11 (Max King)
Women's course record
4:01:23 (Jodee Adams-Moore)
Field size
600+ runners (2025 field; race fills and operates a waitlist)

Entry requirements

Entry status
Sold out: Sourced entry status says this edition is sold out.
Cut-off
8-hour time limit; course closes 4pm
Sold out
Yes
Qualification status
No qualifier required; open first Come registration that fills and uses a waitlist.

Race day logistics

Aid stations
5

Access and course status

Start
Fairhaven Park, 107 N Chuckanut Drive, Bellingham, WA 98225
Finish
Fairhaven Park, 107 N Chuckanut Drive, Bellingham, WA 98225

Course facts

Course type
Loop
Surface
100% un Paved trails
Landmarks
Interurban Trail, Chuckanut Mountain Ridge, Fairhaven Park
Notable features
  • One of the largest and most competitive 50k trail races in the USA
  • USATF sanctioned
  • menstrual products provided at aid per Trail Sisters commitment
  • Lollipop course: 10k on the smooth Interurban Trail to start and finish, with the famous middle 30k climbing, traversing and descending the Chuckanut Mountain Ridge through Pacific Northwest terrain
  • a mountain ultra with technical terrain and variable weather
  • Six on-course aid stations at approx 6.8, 10.2, 13, ~16 (surprise), 20.3 and 25 miles

How hilly is the Chuckanut 50k Ultramarathon?

20%10%41%11%18%
  • Steep descent 20%
  • Descent 10%
  • Flat 41%
  • Climb 11%
  • Steep climb 18%
Total ascent
1,416 m
Net elevation
−5 m
GAP factor
8.6%
Longest climb
2,340 m at 9.2%
Gradient mix and ascent are derived from the course geometry under our published normalisation, not taken from organiser marketing.

What are typical race-day conditions?

  • 7°CTypical temperature
  • 16 kphTypical wind
  • 5 mmTypical rainfall
  • 85Favourability /100
Typical conditions for the race date and locality, within the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

More race details

Is the Chuckanut 50k Ultramarathon flat?

Its normalised GAP factor is 8.6% slower than a flat course, with about 1416 m of total ascent.

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (2)

Read the full methodology →