
The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual)
Rock the Loch offers a scenic trail challenge at Castro Valley's Loch Chabot.
Race Date
Jun 26, 2026
Location
Castro Valley, CA
Quick facts
- Date
- Friday, June 26, 2026
- Location
- Castro Valley, California
- Distance
- Half marathon (13.1 mi) + 5K, 10K, 13.1 Miles
- Course
- Loop Course
- Terrain
- Mixed
- USATF certified
- Not listed
- Finishers on record
- 75
Highlights
Good For
Atmosphere
Course
The Experience
Rock the Loch invites runners to explore the scenic trails of Loch Chabot Regional Park in Castro Valley, California. The event, which has seen editions in 2021 and 2022, offers a half marathon, 10K, and 5K, with a virtual option available.
The half marathon is a stout challenge, featuring nearly 1,700 feet of ascent and descent over a course that is mostly trail with a few miles paved. It's recommended for experienced trail runners. The 10K is a mix of paved and trail sections, suitable for those new to trails, while the 5K is entirely paved and billed as a great option for a first or fastest 5K. Runners can expect quality nature therapy and incredible views, with DJ Cryptid spinning tunes and a handcrafted race woodallion as a unique finisher's reward.
Race-provided description
We cannot promise you'll encounter any cryptic, aquatic creatures at Loch Chabot, but you might! We DO promise a gorgeous trail run on the scenic trails of Loch Chabot Regional Park, some quality nature therapy, and some incredible views! We'll also hook you up with some awesome swag (an awesome shirt, a handcrafted race woodallion), a Rock the Loch beer sampler stein, & more), quality post run beverages/snacks, DJ Cryptid spinning your favorite tunes before/during/after the race, and more! If you can't join us LIVE at Loch Chabot, no problem! We're supporting a VIRTUAL participation option as well. Where: Lake Chabot in Castro Valley, CA. When: Sun, 6/28- Early Half Start-8:15AM (for those needing 3.5-4 hours), Standard Half Start-9:15AM (for those needing 3 hours or less), 10K Start-9:30AM, 5K Start- 9:45AM. Course Maps: 5K Course Map, 10K Course Map, Half Marathon Course Map. Course Details: The 5K is 100% paved. It's a great course for conquering your first and/or fastest 5K!The 10K is 50% paved, 50% trail, and includes '1' tough climb. The 10K is a great option for those new to trails. The Half Marathon includes 3ish miles paved and the rest is trail. The Half includes nearly 1,700 feet of ascent/descent. The half is a STOUT challenge we'd recommend only for experienced trail runners. Aid Stations: The 10K includes '1' aid station approximately 3 miles into the race. The Half Marathon includes aid stations at 4.1 miles, 7.65 miles, and 9.85 miles.Aid stations include water, Skratch Labs electrolyte drink, GU Energy products, Saltstick products, chips, and pretzels. The Experience: All Rock the Loch participants receive.... An epic, trail run at Loch Chabot (assuming you're not participating virtually)An AWESOME race woodallion designed by Aravaipa ArtworxA sweet lifestyle teeA custom Rock the Loch beer sampler stein.Post race snacks/beverages including Bellwether Farms yogurt, Jambars, and more!Access to the post race BREWFEST DJ Cryptid spinning your favorite tunes before/during/after the race Pre-Race Bib & Shirt Pickup: Sat, 6/27 from 12-4PM at Renew PT (460 Boulevard Way, Suite 2D) in Oakland. *NOTE-A friend can pickup your bib/shirt for you provided they furnish proof of your registration and a copy of your ID/driver's license. If you cannot claim your bib/shirt on Sat, 6/27, we will support race morning bib/shirt pickup from 7:30-9AM at the start/finish area. PLEASE NOTE WE CANNOT SUPPORT REFUNDS, TRANSFERS, AND/OR CREDITS. In the event of race cancellation due to wildfires, hazardous air quality, hazardous weather conditions, natural disasters, COVID and/or other global pandemics, or any 'act of God' that is beyond our control, we cannot support refunds, transfers, and/or credits. Please note this has only happened ONCE due to COVID in 2020, but anything is possible. Please make sure you are comfortable with these potential risks before you sign up. In the event of race cancellation due to any of the aforementioned, we will ship all race swag/items to participants and provide direction around navigating the course(s) on your own. We'll also provide direction around submitting your result. We also cannot support refunds, transfers, and/or race credits if you get injured in the days/week(s) leading up to race day, if your schedule changes in the days/week(s) leading up to race day, if a work trip comes up that makes it impossible for you to attend on race day, and/or any other professional or personal matter that arises making it difficult for you to attend in person on race day. In the event of any of the aforementioned, we will ship all race swag/items to said participants and provide direction around navigating the course(s) on your own. We'll also provide direction around submitting your result.
Logistics
Race Day
Friday, June 26, 2026
Start Time
9:15 AM
Giveaway
Rock the Loch Shirt, Race Woodallion, & more!!
Start Location
Lake Chabot Regional Park, Castro Valley, CA, 94546
Course Info
Course Type
Loop Course
Terrain
mixed
Scenery
Lake River, Park
Surface
Dirt Trail, Paved
Difficulty
Hilly
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
View Course Map
Open on Strava
2 other maps for this race
Quality Score
2 years running
~38.5 finishers a year
small race — neutral
2% returning runners
5 timing sources
no finisher data yet
winner 1:29:01
typical high 68°F
Race Day Weather
5-year historical avgStart (Low)
54°
Afternoon (High)
68°
Pleasant conditions — light layers at start, comfortable by finish
0.0"
Precipitation
12 mph
Wind
78%
Humidity
Historical Finish Times
How 75 finishers actually crossed the line across 2 years.
Most recent
2022
Total finishers
75
Median time
2:35:05
Latest turnout
49
States
1
Turnout by year
2021–2022
Hover the histogram to inspect specific finish times.
Frequently asked
When is the The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual)?
The The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual) is held on Friday, June 26, 2026, starting at 9:15 AM.
Where does the The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual) take place?
It takes place in Castro Valley, California.
What distances does the The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual) offer?
The half marathon (13.1 miles), plus 5K, 10K, 13.1 Miles.
Is the The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual) course flat and good for a PR?
The The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual) is a hilly, loop course course.
How many people run the The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual)?
HalfRuns has finish records for 75 runners who have completed the The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual).
HalfRuns editorial — independent, no paid placement.
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