Events in Contra Costa County, California | 2026-2027

Reservoir Dogs Trail Run [ultrasignup.com]
Sat, Oct 04, 2025

5k 10k 35k Half Marathon Run Trail
Contra Costa County, California, United States
OpenStreetMap Google Maps
8th Annual 2026 Colusa Circle 5K [raceroster.com] [Register at raceroster.com]
Sat, Mar 14, 2026 at 8:00 AM
Description
Zip Code East Bay is proud to present the eighth annual Colusa Circle 5K, a race to raise funds for a charitable cause. We look forward to seeing you at the Colusa Circle this year for the...
Zip Code East Bay is proud to present the eighth annual Colusa Circle 5K, a race to raise funds for a charitable cause. We look forward to seeing you at the Colusa Circle this year for the family-friendly fun run (walk and roll, too)!

This year's race beneficiary is Tiny Village Spirit, our neighbor in Richmond. Their mission, as a local non-profit organization is to build emergency housing villages as an innovative model for addressing the housing crisis. Funds raised will go directly to support their work to transform the lives of unsheltered Richmond youth. They are at a critical phase in completing the Tiny House Village, Farm and Garden, which will double the number of dedicated emergency housing units serving young people, ages 18 to 24, in Richmond, CA.

Learn more at https://www.TinyVillageSpirit.org.

Register early (before Feb 28th) for a discounted rate!

We will also be collecting used running shoes and new socks for people and communities in need. Shoe and sock donations can either be dropped off at Zip Code East Bay prior to the event or on race day at the starting line.

What to (or what not to) Expect
- This is a charity race - we are here to raise money and have fun, not to set any personal racing records.
- The course is not USATF certified.
- The race will take place RAIN OR SHINE!
- There will be runners, walkers, rollers and strollers on the course: look out for one another and be respectful of your fellow racers.
- ALWAYS stay on the sidewalk.
- Respect all traffic signals, keep an eye out for signage and for volunteers with safety vests along the race route - they are there to keep you safe!
- We will honor the first finishers (but everyone gets a high five for showing up and participating.)
Colusa Circle 5k Route

Event Schedule
- March14th: 7:00 AM PDT - Registration Opens
- March14th: 7:45 AM PDT - Stretch + Warm Up
- March14th: 7:45 AM PDT - Registration Closes
- March14th: 8:00 AM PDT - Race Start
- March14th: 9:00 AM PDT - Prizes
5k Fun Run Run Walk
388 Colusa Avenue, Contra Costa County, California, 94707, United States
OpenStreetMap Google Maps
Diablo Summit Challenge | Nomadic Adventure Club [nomadicadventure.club] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Mar 21, 2026 at 9:00 AM

22.5k
96 Mitchell Canyon Rd, Contra Costa County, California, 94517, United States
OpenStreetMap Google Maps

Wildcat Half Marathon [finishers.com] - Facebook
Sat, May 30, 2026

Half Marathon Run Trail
Contra Costa County, California, United States
OpenStreetMap Google Maps
Berkeley Trail Adventure [insidetrail.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Sep 12, 2026

10k 35k 50k Half Marathon Trail Ultra
Lake Anza Road, Contra Costa County, California, 94708, United States
OpenStreetMap Google Maps
Rocky Ridge 2026 [brazenracing.com] [Register at raceroster.com]
Sat, Sep 19, 2026 at 8:00 AM

Description

This is the race your momma warned you about! The half marathon cannot be described as "flat and fast" or "good for beginners" or with any other nice phrase. In fact, the phrases most commonly used...

This is the race your momma warned you about! The half marathon cannot be described as "flat and fast" or "good for beginners" or with any other nice phrase. In fact, the phrases most commonly used to describe it would be unprintable. But...once you finish the course, you will have experienced trails and seen views that few others ever will. And you will have a lifetime of bragging rights!

The Rocky Ridge Half Marathon is the finale for the 2025/2026 Ultra Half Marathon Series (series participation is not necessary to enter race).

The 10K and 5K are not quite as intense as the half marathon, but don't worry, those runners will also be challenged with some hills and rewarded with some rarely-seen vistas.

If you are one of those brave souls ready to face either victory occasion and face this beast, come join us!

5k 10k 21k Run Trail Virtual
Trapline Trail, Contra Costa County, California, United States
OpenStreetMap Google Maps

6 events in Contra Costa County, California

Description

Description

Local Clubs & Organizations