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Marathon calendar
December 2025
No published marathon dates for this month yet.
Try another month or search all upcoming marathons.
Missing a marathon in December 2025?
Race organizers can send the official source for a free listing review when this month is missing a race date or showing stale calendar details. We verify the official source before publishing — no fee.
- Free listing review
- Official source verification
- Runner-ready listing
- Organizer dashboard
Search first if the race may already be listed. Missing event or stale date? Submit the official source with this month context prefilled.