Your next start line awaits.
Find a race worth training for.
Announced editions, with the details that matter.
Explore a collection, then open the details and share a few ideas.
Race dates, distances and links are checked against organizer pages.
No invented scores or review counts. New races start with no ratings.
We’re building a runner knowledge base. Share advice from a race you completed. Reviews are moderated before publication.
Organizer payments will never change community ratings or organic recommendations.
Join a free research conversation about runner feedback or race discovery. We are researching these workflows before offering paid tools. No payment details or subscription required.
Tell us how you collect feedback, identify recurring issues, and decide what to improve. We can discuss whether a clearly scoped report would help.
Tell us how you measure race discovery and registration sources. Analytics and campaign tools are not available today.
No report, dashboard or ownership claim is activated by submitting this form. Any future pilot would have its scope, delivery date, price and cancellation terms agreed separately.
Castro Valley destination photo, not a view of this race course. Castro Valley Library entrance (2026-09-15 19:01:01). Photo by BriefEdits · CC BY-SA 4.0 · Original image. Resized, display-cropped and gently color-graded.
Mixed surfaces course. Exact distance is not yet confirmed.
A New Year’s Day trail half marathon at Lake Chabot. It is part of the Ultra Half Series.
Official sources and recorded checks for this edition.
Checked Oct 14, 2026, 3:22 AM UTC.
Recorded value: 2027-01-01
Checked Oct 14, 2026, 3:22 AM UTC.
Recorded value: mixed
Checked Oct 14, 2026, 3:22 AM UTC.
Recorded value: scheduled
Recorded source snapshot, prepared Oct 14, 2026. Availability, fees and logistics may change. Live details will refresh when available; the recorded details may change. This snapshot date is a data retrieval date, not a new organizer verification.
The route
2027 · 10K
A route map has not been verified for this exact edition and distance.
This map shows the race’s listed city, not a verified start or finish. Exact start and finish locations are not confirmed.
Loading area map…
Runner field notes
What do you wish you’d known before registering?
Use the checkered flag on the race image to record your experience when saving is available.
Price not yet confirmed
Loading current details…
