Lost Lake 25k Race Info



Avg Temps f.


Gain/Loss in ft


Furthest Aid

6.9 miles

Highest Elev.


Time Limit

8 hours (6pm)





Course Records

Jim Mccue (2:02:56)

Kathleen Harri (2:23:25)



Longest Climb



Summary: Challenging, hilly course with a mix of trails and fire roads. There are several challenging, leg-burning, steep ascents, slow, technical, rolling ridges, and a limited supply of fast “free speed” on the descents. The course is point to point and shares the second half of the 50k course, which finishes at Larrabee State Park.

Race Details

Detailed course description:

  1. The 25k race starts at the Pine and Cedar Aid Station of the 50k course (mile 16.6 for them) and then shares the rest of the 50k course until the finish.
  2. The course starts out with a 1,400 foot gain over the first 2 miles
  3. Then it takes a dip of 100 feet, along with another ascent of 100 feet, before dropping 500 feet over the next 1.5 miles
  4. Next the course gains 100 feet over the next mile, so very gradual, and then gains 500 feet over the next .5 miles, which is about 5.5 miles into the race
  5. Runners then lose 1,400 feet over the next 4 miles, steeper in some places more than others, until about 9.5 miles into the race. In the middle of this descent, runners hit the first aid station (Fragrance Lake) at mile 6.9, then start a loop of 5.8 miles until hitting the same aid station again.
  6. The course is fairly flat for the next 1.5 miles, until around mile 11 (the Interurban Trail, which is gravel)
  7. The last big ascent is next, gaining 750 feet over the next 1.2 miles, until mile 12.2, then starts a descent (hitting the second aid station, Fragrance Lake, at 12.7)
  8. Finally runners lose 900 feet all the way until the finish, from about 12.2 to 14.9 miles

Course Map – see Strava links below

Lessons Learned from Race Reports

Not much space in the trailhead parking lot at the start for a warmup before the race

Course is well shaded with a fair amount of rocks and roots, and nettles alongside the course

Work at running hills on tired legs, given the race starts out with a 1400 foot climb and then has two more big climbs after that, in addition to small rollers. There’s very little trail to recover on, such as flat, easier sections.

There is a chance for being warm since the race starts later at 10am

Race is pretty spread out of 50k runners by the time the 25k starts and since there aren’t many entrants (haven’t been in the past), both races get spread out


Total gain/loss: ~3400/~3500

Total climbs: 1×1400 feet, 1×750 feet, 1×500 feet, lots of little rollers of 50-100 feet

Longest climb: 1,400 feet over 2 miles

Steepest climb: 500 feet over .5 mile

Elevation profile – See Strava links below

Aid stations

Total aid stations: 2

Furthest distance apart: 6.9 miles

Locations: Miles 6.9, 12.7 (Fragrance Lake Aid Station)

What’s available: The fully stocked aid stations will have an electrolyte drink, water and a large buffet of food including cookies, potatoes and salt, chips, an assortment of gummy and hard candy, and fruit (bananas, grapes, and oranges).

Drop bags: None (50k only)

Crew access




Runner Tracking


Race qualifiers


Race reports

Maria’s Race Report



Strava activities and GPX files





Packet pickup

Morning of the race


The 25k runners will be shuttled from the 50k start to the 25k start at the Pine and Cedar Trailhead. Both race distances will finish at the Larrabee State Park Lost Lake Day Use parking lot (50k Start). The Lost Lake 50K will start @ the Larrabee State Park Lost Lake Day Use parking lot (Just at the base of Chuckanut Mountain) in Bellingham Washington.

Race start and cutoff times

Start at 10am

8 hour cutoff (6pm)

5pm cutoff at mile 12.7

Race Website



Via Ultrasignup


Chuckanut Mountain, Bellingham, WA. Course finishes at Larrabee State Park.


Take I-5 to Bellingham to Exit 250 (WA-11 S/OLD FAIRHAVEN PKWY), head West onto WA-11/OLD FAIRHAVEN PKWY. Continue to follow WA-11 for 1.3 miles. Turn LEFT onto WA-11/12TH ST. Continue to follow WA-11 for 5.3 miles. The Clayton Beach parking lot will be on the left hand side of Chuckanut Drive.

A Washington State Discover Pass is required to park in the Clayton Beach parking lot or anywhere else in Larrabee State Park. You can buy a pass at the park on the morning of the race or you can purchase one online. A one-day pass is $10 and an annual pass is $30. Passes can be purchased from the state website or at vendors where state fishing and hunting licenses are sold. Passes should also be available on race morning.


Fairfield Inn & Suites (Burlington)

The Skagit (Bow)

Days Inn (Bellingham)

Holiday Inn Express (Burlington)