Announcing the Cuyamaca 100k 2021 Training Run Schedule:


7/10, 7AM  Loop 1, Sweetwater to Merrigan to Green Valley to Sweetwater (13.5 miles)  First section of the course (minus the first 1.4 miles).  


7/31, 7AM Loop 2, Starting at Sweetwater, 12.6 miles.


8/21, 7AM Loop 1, Green Valley to Cuyamaca Peak to Paso Picacho to Camp Cuyamaca to Green Valley, 21 miles.


9/4, 7 AM Loop 3, Sunrise Trail head Start, 18.2 miles.


More details for each route will be announced closer to the run date.


Fourth Run Details:

9/4, 7AM Loop 3, Start at Sunrise Trailhead, on S-1 (Sunrise Hwy) 18.3 miles.

The run starts at Sunrise Trailhead which is the location of the 1st aid station on Loop 3 of the course. It is mile 6.8 of Loop 3 and mile 51.4 of the course. We'll follow the direction of the course to the 2nd aid station of Loop 3, Pedro Fages, then toward the finish line of the course at Camp Cuyamaca. There is water at multiple locations in Camp Cuyamaca, including a drinking fountain at the starting line and a spigot at the maintenance building you'll run by on the way through. This will be mile 11.4. Next, we'll leave Camp Cuyamaca and complete the first 6.8 miles of loop 3 to get back to Sunrise.

We will have a couple popups, snacks, and cold beverages at the finish, so please bring a chair and plan on hanging out with us afterwards!



Third Run Details:

8/21, 7AM Loop 1, Part 2 Starting at Green Valley Campground, Arroyo Seco Picnic area (enter the Green Valley campground, turn right and it's straight ahead), 21 miles.

The run starts at Green Valley where we stopped following the course on run #1. We'll climb to Cuyamaca Peak (9 miles), descend to Paso Picacho (14 miles) where water and aid will be provided, then run back to Camp Cuyamaca (finishing loop 1), and lastly following the first mile and a half of the course to Sweetwater where we started run #1.

We will have a couple popups, snacks, and cold beverages at the finish, so please bring a chair and plan on hanging out with us afterwards!



  • Meet at Arroyo Seco Parking Area in Green Valley ($10 fee applies, be prepared to use the passport parking app)

  • Optionally, the East Mesa and Oakzanita parking areas do not have a fee. Meet a friend and carpool from there, or start early and jog over to the start.

  • Run starts at 7AM sharp

Second Run Details:

7/31, 7AM Loop 2, Starting at Sweetwater Parking Area (Harvey Moore Trailhead), 12.6 miles.

We will have a couple popups, snacks, and cold beverages at the finish, so please bring a chair and plan on hanging out with us afterwards!




  • Meet at Sweetwater Parking Area ($10 fee applies, be prepared to use the passport parking app)

  • Optionally, the East Mesa and Oakzanita parking areas do not have a fee. Meet a friend and carpool from there, or start early and jog over to the start.

  • Run starts at 7AM sharp


First Run Details:

7/10, 7AM  Loop 1, Sweetwater to Merrigan to Green Valley to Sweetwater (13.5 miles)  First section of the course (minus the first 1.4 miles). 

We will have a couple popups, snacks, and cold beverages at the finish, so please bring a chair and plan on hanging out with us afterwards!

.gpx File for Training Run #1

Turn by turn directions:  

  • Meet at Sweetwater Parking Area ($10 fee applies, be prepared to use the passport parking app)

  • Run starts at 7AM sharp

  • Head up the trail to the right as you leave the parking lot, and in 0.1 miles turn right onto the East Side Trail.

  • At South Boundary Fire Road (Mile 1.4) turn right and cross the road.

  • Follow South Boundary Fire Road to Sweetwater Trail and Turn left (Mile 3.3)

  • Follow Sweetwater Trail to 4-way intersection, go straight across to Merrigan Fire Road (Mile 4.5)

  • Follow Merrigan Fire Road to Merrigan Trailhead and turn around (Mile 6.4)

  • Returning the way you came on Merrigan Fire Road, turn left at Dead Horse Trail (Mile 7.1)

  • Follow Dead Horse to CRHT and turn right (Mile 9.4)

  • Stay on CRHT to intersection with Falls Fire Road, turn right (mile 10.6)

  • At Falls Parking area, turn left and follow the main road through Green Valley Campground to Arroyo Seco Picnic Area.  Cross the parking lot and find the connector trail (labeled To Westside & Monument Trail) near the small amphitheater area (Mile 12.3)

  • Follow connector trail to West Side Trail and follow West Side to HWY 79 (marked on trail markers.

  • Find our popup tent and tables and join us for some refreshing, cold beverages!


Too short? At Green Valley Campground, go to campsite # 38, find the Pine Ridge Trail, and follow it 2 miles over the ridge, make two rights and come back to Green Valley via Arroyo Seco Fire Road.  You’ve added about 2.5 miles and seen another 2 miles of the course.


Still too short?  At the finish, make a left and run 1.4 miles to Camp Cuyamaca and the starting line, and come back the same way.  There, another 2.8 miles.  Happy now?




2021 Event

Today, 5/10, we will begin inviting runners to register officially.  Waitlisted runners will be invited in the order in which they were added.  After reaching capacity, remaining runners will continue to be waitlisted until such time as space is available.  


Thanks for your patience and understanding as we have all been working through this challenging time!




Cuyamaca Outdoor School
Since 2012, the Cuyamaca 100k has benefited from the support of the Cuyamaca Outdoor School.  The venue and facilities that host our race are home to a 6th grade camp program that has inspired the love of the outdoors in thousands of students over the course of the 70+ years.  Please join us in supporting the outdoor education of San Diego's youth at sixthgradecamp.org.

San Diego Ultra Slam
The RD's of San Diego's mountain ultra races have put together a special award for those runners who complete four races of each iconic ultra distance; 50k, 50 miles, 100k, and 100 miles. Please visit sandiegoultraslam.com for more information.