Best Marathons in September 2026 (USA)
The top marathons happening across the United States in September 2026, 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 10 marathons this september
Showing the top 10 of 49 marathons we track for September 2026. See the full list →
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 September 2026?
Based on RaceScore, the highest-rated marathon in September 2026 is Cadillac YMCA Festival of Races in Cadillac, MI. It scores well on a balance of PR potential, value, and runner-rated vibe.
How many marathons are there in the USA in September 2026?
We currently track 49 confirmed marathons on the September 2026 calendar. The list updates automatically as organizers publish new events.
Is September a good month to run a marathon?
September sits in the shoulder season for most US race regions — expect mild weather and a mix of championship and casual events.
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.