Best 5Ks in December 2025 (USA)
The top 5ks 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 5k, or planning a destination race weekend, this guide narrows the calendar to the events most worth your time.
Top 10 5ks this december
Showing the top 10 of 11 5ks we track for December 2025. See the full list →
How we rank 5ks
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 5k in December 2025?
Based on RaceScore, the highest-rated 5k in December 2025 is Plainfield American Legion 5K Charity Run in Plainfield, IL. It scores well on a balance of PR potential, value, and runner-rated vibe.
How many 5ks are there in the USA in December 2025?
We currently track 11 confirmed 5ks on the December 2025 calendar. The list updates automatically as organizers publish new events.
Is December a good month to run a 5k?
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 5k?
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.