Be it on eight legs or two, get ready to traverse the hills of Los Vaqueros Reservoir! Brazen Racing is proud to carry on the popular Los Vaqueros Tarantula Run on October 154h 2017!

The Tarantula Run was first held in 2006, organized to recognize the Contra Costa Water District's 70th anniversary and encourage visitation to the Los Vaqueros watershed. It's held in October, since that's the time when male tarantulas are usually roaming the watershed looking for mates. The run has plenty of excitement including the chance of tarantula sightings along the course! Add in a free Kids Spider Scramble for children 10 and under of half marathon, 10K and 5K runners and you have adventure for everyone!

Walkers/hikers and runners of all levels are welcome!

Age group medals will be awarded to the top 3 finishers in 5 year categories (less for the younger ages).

All races will be professionally timed.


Half Marathon: 8:00 am

10K: 8:15 am

5K: 8:30 am

Kids Spider Scramble: 7:35 am

About Los Vaqueros Reservoir

Los Vaqueros is a nearly 20,000-acre protected watershed that offers outstanding fishing, challenging hikes and an opportunity to learn about the fascinating history of the area.

Contra Costa Water District's Los Vaqueros Reservoir was expanded in 2012, and can now store up to 160,000 acre-feet of high quality water for the District's customers.

Learn more about the park here.

Registration Fees

5K Closed

5K No Shirt Closed


10K Closed

10K No Shirt Closed


Half Marathon Closed

Half Marathon No Shirt Closed


Remote Runner Closed

Remote Runner No Shirt Closed


Event Schedule

  • October 14 7:30 AM PDT - Early Half Start (for those walking the half marathon, planning to take longer than 3.5 hours)

  • October 14 7:35 AM PDT - Kids Spider Scramble

  • October 14 8:00 AM PDT - Half Marathon

  • October 14 8:15 AM PDT - 10K

  • October 14 8:30 AM PDT - 5K

Contact Information

Event Location

100 Walnut Blvd, Brentwood, CA, United States

Click here to view map