Complete the Olympic Distance solo or tackle it with friends in the relay division!

SGRAIL Marin Triathlon is a USA Triathlon Sanctioned Event

SGRAIL Swim Course

1,500 meter swim in the protected waters of San Pablo Bay.

Waves start every five minutes, on a well-marked and supported triangular course made up of three orange teardrop buoys before heading back into Transition 1.

SF Swim Club will be managing the swim course, ensuring all athletes safety.

Course may change based on tide, current, and water quality. 

GPX Map

SGRAIL Bike Course

40 km on Point San Pedro Road and North San Pedro Road — one short lap + three long laps. Road, gravel or mountain bike — everyone is welcome.

We plan to have timing mats at all the turnarounds to ensure all athletes have completed the full bike course.

As you exit T1, there will be a Mount/Dismount zone. Have your bike helmet on and clipped before you unrack your bike in T1. Mount your bike within the Mount/Dismount zone ONLY. 

The first half mile up Cantera Way is a climb, be ready to grind from the get go and have your bike set in a gear that allows you to spin up the hill! At the top you will make a right onto Point San Pedro Rd and within a quarter mile (.75 miles) you will slow to make the first turn for the small loop at Biscayne Drive and Point San Pedro Drive. Listen to the staff assisting as they are focused on your safety as you manage this portion of the race. Your first long loop starts when you hit the next turnaround at Point San Pedro Dr and McNears Brickyard Rd at mile 1.7. You are now off to the races completing three long loops. The big loop turnaround is at China Camp State Park main entrance at Back Ranch Rd, mile 5.5. This is your longest stretch (3.8 Miles one-way and 7.6 Miles round trip). You complete the long loop THREE times. After your third complete loop you will have 1.1 Miles from McNears Brickyard Rd back to T2.

Course Segments

Bike start to completion of small loop (T1 -> McNears Brickyard Rd) = 1.7 Miles

Long loop (McNears Brickyard Rd -> Back Ranch Rd -> Back Ranch Rd) = 7.6 Miles

Final Stretch (McNears Brickyard Rd -> T2) = 1.1 Miles

You'll see, when looking at the course, Cantera Way is a climb out of the T1 and a steep descent back into T2. Due to this and our desire to have a safe and fair playing field. ALL CYCLISTS, when finishing the bike course, will have a mandatory "FOOT DOWN" stop coming down Cantera Way, prior to the dismount zone. This is to make sure your descent is controlled and all athletes, spectators and staff are safe as bikes are returning. Not abiding by this mandatory stop on the descent will result in a disqualification, not a penalty, we are ensuring everyone who comes to the event goes home in one piece.

GPX Map

SGRAIL Run Course

10K Run from T2 to the finish. You will run out of T2 and up Cantera Way to Point San Pedro Road. You will make a left on Point San Pedro Road and head west to your first water stop that is 1.7 Miles away. You will then turn back around and run to the turnaround point at the top of Cantera Way on Point San Pedro Road. That is your first loop. Complete the loop one more time and then you are on to the homestretch!

Course Segments

T2 -> Left @ Point San Pedro Rd (.4 Miles)

Point San Pedro Rd @ Cantera Way -> Aid Station Turnaround @ Main Dr (1.3 Miles)

Aid Station Turnaround @ Main Dr -> Point San Pedro Rd @ Cantera Way (1.3 Miles)

Point San Pedro Rd @ Cantera Way -> Aid Station Turnaround @ Main Dr (1.3 Miles)

Aid Station Turnaround @ Main Dr -> McNears Beach FINISH (1.9 Miles)

GPX Map

SGRAIL Triathlon Cutoff Details

Swim cutoff – out of the water no later than 1 hour after your start wave. No athletes will be able to start the bike course after 10:20 AM.

Bike cutoff – Northbound at Cantera Way at 11:45 AM, the course will be closed to the Northbound turnaround and all athletes will be directed to McNears Beach via Cantera way at 11:45 AM no matter what loop you are on.

Run cutoff – Mile 3 at Cantera Way at 1:22 PM. All athletes at 1:22 PM will be forced to the finish area and not allowed to continue the run course.

If you are cutoff, you will be a DNF. You may not continue with the next portion of the event. You must hit cutoffs to continue the course.

Relay Teams will receive their chips Saturday morning October 3, 2026. You can pick up all your swag early if you wish. You will not get the timing chip till Saturday morning so show up with enough time to pick that up on Saturday. 

You will share the same timing tip. When you change positions on the course, take off the timing chip and give it to the next person. 

If your relay team loses the Velcro timing chip or does not turn it in after the race it will be a $30 charge to the team to replace. PLEASE don't lose the Velcro timing chip!

Team members will be able to enter the transition zone one at a time when one partner leaves, the next can enter. Take off the Velcro timing chip and give it to the next person. If you are running back-to-back legs, then no team member can be in the transition. 

For a complete overview of the USAT racing rules please refer to their race guide HERE

Eight Commonly Violated Rules

Helmets and Chinstraps

Helmets must be worn and securely fastened at all times while in possession of your bike. This means from the time you remove your bike from the rack at the start of the bike leg, until after you have placed your bike on the rack at the finish of the bike leg.

Unauthorized Assistance

No assistance other than that offered by race staff (including volunteers), medical officials and active participants may be used. A participant shall not physically assist the forward progress of another participant on any part of the course. In the swim portion, you are able to seek support from the on water staff, however, they may not assist you in the forward progress on the course.

Non-Draft Legal Bike Position Rules

Athletes must ride right and only move left to complete a legal pass and must not block athletes attempting a legal pass. Athletes must not pass on the right. Drafting is not allowed. An athlete should not attempt to complete a pass unless the athlete is highly confident in their ability to complete the pass in the allotted amount of time. Once an athlete enters the draft zone of another cyclist there is only one exit and that is out the front. 

The bicycle draft zone is 12 meters (39.3 feet) long, extending backward from the leading edge of the front wheel of the leading cyclist (approximately six bicycle lengths between cyclists) and includes the entire width of the road. Athletes have 25 seconds to complete an overtake through this zone. 

Entire Course

Athletes must complete the race course in its entirety and as prescribed including in segment order.

Headphones and Communication Devices

Participants may carry a phone (such as, mounted on bike handlebars or in an arm band) but may not use communication devices of any type - including but not limited to cell phones, smart watches and two-way radios - in any distractive manner during the competition. A distractive manner includes but is not limited to making or receiving phone calls, sending or receiving text messages, playing music, using social media, taking photographs or using one- or two way radio communication. Using any communication device in this manner during the competition may result in disqualification

Glass Containers

Glass containers are prohibited. Bringing a glass container into transition may result in disqualification.

Race Numbers

All athletes are required to wear race numbers at all times during the run. Numbers must be clearly visible at all times. Numbers may not be altered in any way that prevents clear identification.

Race Number Transferring

Do not transfer your number to any other athlete or take a number from an athlete that is not competing. The penalty for doing so is disqualification and one year suspension from membership in USAT for transferring a number without race director’s permission.