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Castro Valley · destination, not courseCastro 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 running; the exact distance still needs confirmation.
Partial information
Organizer describes about 70% dirt and 30% paved, with runnable rolling hills. Measured total ascent remains unverified.
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Recorded
Mixed surfaces · loop
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A trail half marathon around Lake Chabot to close the year. The optional two-day challenge combines separate half marathons; it is not a single marathon event.
Approximately 30% paved and 70% dirt.
Exact-distance organizer download linked on current event page. GPX link provenance verified; raw route geometry not inspected.
Pacific time
Regular half time limit.
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Official organizer information
Recorded source snapshot, prepared Oct 10, 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.
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