Best Marathons in December 2025 (USA)
The top marathons happening across the United States in December 2025, ranked by RaceScore — our 0–100 composite of PR potential, value for money, vibe, beginner-friendliness, and data confidence. Whether you're chasing a personal record, looking for a beginner-friendly first marathon, or planning a destination race weekend, this guide narrows the calendar to the events most worth your time.
Top 7 marathons this december
How we rank marathons
Every race on running.services is scored on a deterministic 0–100 scale we call RaceScore. It's a weighted blend of:
- PR potential — flat, fast, weather-friendly courses score higher.
- Value for money — entry fee versus what's included.
- Vibe — crowd, scenery, post-race party, festival features.
- Beginner-friendliness — generous cutoffs, walker policy, course support.
- Family-fit — kids races, stroller policy, spectator access.
- Data completeness — verified course, photos, elevation, reviews.
Frequently asked questions
What is the best marathon in December 2025?
Based on RaceScore, the highest-rated marathon in December 2025 is Humana Rock 'n' Roll San Antonio Marathon in San Antonio, TX. It scores well on a balance of PR potential, value, and runner-rated vibe.
How many marathons are there in the USA in December 2025?
We currently track 7 confirmed marathons on the December 2025 calendar. The list updates automatically as organizers publish new events.
Is December a good month to run a marathon?
December runs cold in most of the country, which is great for distance running if you train in layers, but watch for icy starts in northern states. Southern races (FL, AZ, TX) tend to draw the biggest fields.
How do I find a beginner-friendly marathon?
Look for races with a generous time cutoff, a walker-friendly policy, and a flat course. Each race detail page on running.services shows a beginner-friendliness sub-score so you can filter accordingly.