Best Half Marathons in September 2026 (USA)
The top half 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 half marathon, or planning a destination race weekend, this guide narrows the calendar to the events most worth your time.
Top 10 half marathons this september
Showing the top 10 of 60 half marathons we track for September 2026. See the full list →
How we rank half 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 half marathon in September 2026?
Based on RaceScore, the highest-rated half marathon in September 2026 is Aliferis Memorial Race in Alpena, MI. It scores well on a balance of PR potential, value, and runner-rated vibe.
How many half marathons are there in the USA in September 2026?
We currently track 60 confirmed half marathons on the September 2026 calendar. The list updates automatically as organizers publish new events.
Is September a good month to run a half 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 half 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.