Race Details

       The Lost Boys 50 is a point-to-point trail ultramarathon which starts on the Desert Floor of the Anza Borrego Desert State Park, 75 miles east of San Diego, heads west over the mountains and finishes in the Cuyamaca Rancho State Park. This beautiful and extremely challenging run features spectacular geography, historical trails, contrasting landscapes and incredible views. The first half courses through desert washes, canyons and mountain valleys including a brief section where runners must climb over some dry rock waterfalls. Ascending out of the desert, the mountainous second half climbs and descends through a lush alpine environment. 
There are approximately 4 miles of desert washes without roads or trails, 18 miles of jeep roads, and 28 miles of trails with almost 9000' of climb, 6100' of descent and an elevation range of 1200' to 6200'. All but 4 miles of the course is contained within the state parks. 

Well equipped aid stations as follows:


Aid Station #  Aid Station Name Delta Mileage  Cutoff (time of day) Drop Bag  Crew
Start Pinyon Wash 0
1 Boulders 5.1 5.1 No No
2 Pinyon Mtn Valley  7.3 12.4 No No
3 Blair Valley  5.5 17.9 10:00am  Yes Yes
4 Oriflamme 5.3 23.2 No No
5 Pedro Fages (Sunrise) 6.2 29.4  1:30pm Yes Yes
6 West Mesa 6.7 36.1  3:30pm No No
7 Cuyamaca Peak 1 6.8 42.9 No No

Cuyamaca Peak 2 1.02 44.0
No No
Finish Cuyamaca Lake 6.0 50.0  8:00pm Yes Yes



Race rules, guidelines, and general information
  • Rule #1 be safe.
  • Rule #2 have fun!
  • Potential entrants must have completed at a MINIMUM an official trail 50k race (within the race's qualifying time) between April 1, 2015 and the day they register for Lost Boys 50.
  • The race will be held on 4/29/2017 and will start at 5:00AM sharp. The final cut-off will be 8:00PM.  
  • Checkin will begin at the start line area at 4:15 AM.
  • Shuttle option: 
    • There is a $25 shuttle fee. For details on how to reserve the shuttle (click here). 
    • The shuttle bus will pick you up directly in front of the "Lake Cuyamaca Restaurant and Store"
      (15027 Highway 79, Julian, CA 92036 Hwy 79, [white highway mile marker 11.5]).
    • The shuttle bus will LEAVE at 3:30 AM sharp so please arrive early.
    • The bus will arrive at the start line area at about 4:30 AM.
    • You can put any pre-race clothes etc in one of your aid station drop bags which will then eventually work their way back to the finish line.
  • Sunrise is at 6:00 AM and Sunset is at 7:30 PM that day so flashlights may not be needed for most runners.
  • Cutoff Times: For your safety and for consideration of the volunteers there are various cutoff times throughout the race. Runners must LEAVE the aid station before the cutoff time.  Also note that there is a strict 8:00PM finishing cutoff. This makes for a 15 hour limit.
  • Schwag: Every entrant will receive a quality tech-shirt and LB50 logo'd tech shorts. These will be available for pickup at the finish line, even if you unfortunately need to stop early or miss a cutoff please stop by the finish line to collect your schwag. In addition, every finisher will receive a Lost Boys 50 finisher’s medallion.
  • Bibs: Bib numbers will be assigned approximately a week before the race. The physical bibs will be handed out at the start line at check-in.
  • Pacers: Pacers will be allowed to start running with you at Pedro Fages (Mile 29.8) to the finish and cannot be exchanged thereafter. Pacers are to follow all rules that participants follow and should be prepared for the rigorous final 20 miles.
  • CREW: The aid stations are well stocked with food and fluids and experienced ultrarunners, crew is not necessary to run this race. If you choose to have a crew they are allowed at the Start, Blair Valley aid station, Pedro Fages aid station and the Finish. Aid is only allowed at the aid stations and is not allowed throughout the course.
  • Drop Bags: Drop bags will be allowed at the Blair Valley and Pedro Fages aid stations.
    Size: Drop bags should be small, no larger than 12” square please.
    Drop bags will be collected at the start line and returned to the finish line after the aid station closes. After you finish you can stop by Pedro Fages to collect your drop bag while the station is still open.
  • Course markings: The course will be marked with orange surveyor’s ribbon and possibly signs. A ribbon will be placed every 2-3 minutes running time. Keep your head up and look for junctions. Junctions will have multiple ribbons.
    IMPORTANT: If you go more than 5-7 minutes (running time) without seeing a ribbon TURN AROUND you missed a junction.
    Getting off course: If you find yourself lost or off course, you must return to the place where you got off course under your own power in order to continue in the race. Any runner that gets in or on a moving vehicle is disqualified.
  • Entering an aid station: Make sure you check-in at every aid station with the volunteer that is holding the clip board.
  • Properly Dropping (NDF): If you decide not to continue the race you must personally tell an aid station captain. If you do not properly drop and a search and rescue effort is launched on your behalf you will be responsible for the cost of the rescue effort.
  • #2 out on the trail: There will be restrooms or outhouses at the Start line, Pedro Fages, and Finish line area. If nature calls while on the trail, get off the trail and bury your business.
  • Littering: Our ability to secure permits for each of our local mountain events is dependent on all of us being good stewards of the trails. Anyone caught littering will be disqualified from the race. If you see trash out on the trail please try to pick it up and carry it to the next aid station.
  • Highway crossing: There are four highway crossings. It is YOUR responsibility to safely cross the highway.  We will have crossing marshals at each highway crossings throughout the duration of the race. The marshals will not stop traffic, you can think of the marshals as an extra set of eyes and ears for you.
  • Water: Carry adequate water in water-bottles or a camel-pack.
  • Start Line weather (Borrego Springs, CA)
  • Finish Line weather (Rancho Cuyamaca, CA)


See you on the trails!