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San Lorenzo River

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Run along the San Lorenzo River in the shadow of ancient redwoods, abundant rivers and green meadows. This event has everything from a 10K to a 50K giving runners of all stripes a shot at their PB in this beautiful setting. Come for the view or the finisher's medal.

How to enter the San Lorenzo River

  1. 30KM

    Run 30km
    Event passed
  2. Half Marathon

    Run 13.1mi
    Event passed
  3. 10 km

    Run 10km
    Event passed
  4. Ultra

    Run 50km
    Event passed
  5. Marathon

    Run 26.2mi
    Event passed

San Lorenzo River routes

This beautiful race takes place along the San Lorenzo river, a stretch of land that has the best that California has to offer, from the 300 foot redwoods to the quaint streams and every fern in between.

Terrain: The tracks follow an even mixture of single track and dirt roads.

Elevation Gain: This event involves a fair amount of climbing so runners should make sure they have included some hill climbs in their training schedule and warmed up those quads before they hit the track. The 10K offers an 800 foot climb throughout the full distance whilst the 50K route includes almost 5,175 feet of elevation gain through the race.

Event Details

What’s Included
  • Race entry
  • Finisher's medal
  • Participators t-shirt (Early bird registration only)
  • Refreshments & Aid stations
  • Prizes for top performances (M/F)
Raceday Logistics


7:00AM - Registration and Bib Number pickup

8:00AM - 50K, 30K, and half marathon start

8:15AM - 10K start

Please make sure to arrive with enough time to get parked, registered and warmed up before your race.


Spectators are encouraged to get out and cheer on their family and friends as they take on this awesome challenge. The more people the merrier the atmosphere.


Volunteers are a huge part of bringing Coastal Trail Run's epic races to life. Roles vary from race-to-race but often include manning aid stations, helping at registration, or distributing those cherished finisher's medals.

In return, you will receive a 'standard' entry into a race if you help for 5 hours, $25 discount (2 hours), or $15 (1 hour).

If you would like to find out more then simple fill out the form here:

Frequently Asked Questions

Is the San Lorenzo run a cupless event and do I need to bring my own water bottle?
Yes, in the hope of protecting the environment this event will not be supplying water cups at aid stations. Runners must bring their own water bottle which they can refill at the stations if they need to.
Is there a cut-off time at the San Lorenzo run?
Yes, there is a 9 hour cut-off time for all distance.
Is the San Lorenzo run hilly?
No, this is a pretty flat race. The half marathon (longest distance) involves only 380 feet of elevation gain over the whole course.
Have a question? Get answers from our team.

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San Lorenzo River weather forecast

Partly cloudy throughout the day.

Predicted highs
Predicted lows

Meet the organizer

Our events are located in amazingly beautiful parks and recreation areas in California. We are known for our well-marked courses, accurately measured distances, immediate race results, quality shirt designs, and low-key, friendly atmosphere. For courses that are designed to be easier, flatter, and faster, check out one of our Zoom or ZombieRunner events. We have organized over 400 events during the past 16 years. We love trail running and we promise you a rewarding experience.

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