6 running events in Alameda County, California

From big races to Saturday morning group runs—find running events and connect with the local endurance sports community.

• SPASM Lake Chabot Trail Run [runsignup.com]
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  Sat, Apr 11, 2026 at 8:20 AM

  Description

  The course starts at the Marina and travels around the popular Lake Chabot reservoir and surrounding hills. Great course for first-time trail runners!

  (Distances are accurately measured using a Rolatape® surveyor's measuring wheel.)

  2 Miles 3.1 Miles 5 Miles 13.1 Miles 17.9 Miles 26.2 Miles 31 Miles Run Trail

  Alameda County, California, 94546, United States
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• 2026 Lake Chabot Trail Challenge (Half Marathon & 5K) [runsignup.com]
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  Sun, Jun 07, 2026 at 8:00 AM

  Description

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  “Beginning July 1, 2024, the “Honest Pricing Law” or “Hidden Fees Statute,” SB 478, makes it illegal for businesses to advertise or list a price for a good or service that does not include all...

  “Beginning July 1, 2024, the “Honest Pricing Law” or “Hidden Fees Statute,” SB 478, makes it illegal for businesses to advertise or list a price for a good or service that does not include all required fees or charges other than certain government taxes and shipping costs.”

  RACE INFO: We are so excited to celebrate the 42nd annual Lake Chabot Trail Challenge Half Marathon and 5K. This race is well regarded amongst serious trail runners in the outlying areas. The race begins at 8am for the Half Marathon and 8:30am for the 5K. Please arrive early so that you may find parking, pick up your bibs, use restrooms facilities, and be properly prepared to race before the start. Race takes place rain or shine and there are no refunds.

  RACE COURSE: The half marathon course is a scenic, hilly loop, mainly on dirt fire roads. The ridge-line views look down upon scenic Lake Chabot, surrounding grassy slopes, and eucalyptus groves. Mt. Diablo and San Francisco Bay are visible along the route. There are water stations with first aid and radio support; we recommend bringing your own hydration as well. The half marathon has a time limit of 3.5 hours. The 5k (3.1 miles) course is an out and back that has gentle rolling hills and consists mostly of paved surfaces. This route includes one water station with first aid and radio support.

  RACE FEE: Pre-registered runners will be guaranteed a t-shirt if registered by Sunday, May 10th, 2026. The price for the 5K is $40 and Half Marathon $65. You must register by Saturday, June 6th. We will accept race day registration; however, the price for the 5K is $45 and Half Marathon $70. If you register on race day, we can only accept cash, check or Venmo.

  There is a nominal fee (~$5) for Chabot parking lot. Free parking on Lake Chabot Rd and nearby streets.

  RACE PACKET & BIB PICK-UP: We will have race packet and bib pick-up on Sunday, June 7th starting at 7am at the Willow picnic site which is also the finish line area. We will not be mailing out any race packets or bibs. Both races are chip-timed.

  T-SHIRT: Entry fee includes short sleeve, high quality t-shirts for registrations by May 10th so sign-up early. There are no guarantee of t-shirts for runners registered after that date and on race day. We ask for those who did not get a shirt to check in after the race. Please ensure that you select the appropriate t-shirt size. We will not be doing any size exchanges from your original request.

  AWARDS: Finisher's medals to those who complete their race. Age division medals given to the top 3 in each of 12 age divisions in the half marathon and 9 age divisions in the 5K.

  Photos: Race photos are being provided by Darrell Lavin of Darrell Lavin Photography. You will receive an email post-race for instructions on how to access and purchase official race photos.

  QUESTIONS: If you have any questions, please contact Rachel Lunt at teamlunt07@gmail.com.

  DIRECTIONS: The entrance closest to the event's parking lot is: 17404 Lake Chabot Road, Castro Valley, CA 94546. On Google Maps, this will appear as "Entry of Lake Chabot Parking Space." The registration area and start lines are just a few minutes walk from the lot ( just follow the signs).

  3.1 Miles 5k 13.1 Miles Half Marathon Run Trail Walk

  17404 Lake Chabot Road, Alameda County, California, 94546, United States
  OpenStreetMap Google Maps
• Lake Chabot Trail Run [runsignup.com]
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  Sat, Nov 07, 2026 at 8:20 AM

  Description

  The course starts at the Marina and travels around the popular Lake Chabot reservoir and surrounding hills. Great course for first-time trail runners!

  (Distances are accurately measured using a Rolatape® surveyor's measuring wheel.)

  2 Miles 3.1 Miles 4.8 Miles 13.1 Miles 30k 26.2 Miles 50k Run Trail

  Alameda County, California, 94546, United States
  OpenStreetMap Google Maps
• Brazen New Year's Eve 2026 [brazenracing.com] [Register at raceroster.com]
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  Thu, Dec 31, 2026 at 7:30 AM

  Description

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  Whether you're looking to squeeze in your first trail run or you're looking to log that 1,000th mile before the clock strikes midnight on 12/31/2026, this is your chance.

  Note: This year we will have...

  Whether you're looking to squeeze in your first trail run or you're looking to log that 1,000th mile before the clock strikes midnight on 12/31/2026, this is your chance.

  Note: This year we will have back-to-back events at Lake Chabot, Castro Valley with a 5K, 10K and half marathon!

  New Year's Eve, Thursday, 12/31/2026

  New Year's Day, Friday, 1/1/2027*

  Make it a double and join us both days and earn the Brazen New Year Mega-Medal!

  *Note: Each race is a unique event on its own and requires separate registration.

  5k 10k 21k Run Trail Virtual

  Lake Chabot Road, Alameda County, California, 94546, United States
  OpenStreetMap Google Maps