Delaware Half Marathons in September
This is the calendar of all the Delaware half marathons in September. On these race calendars, not only will you be able to search the basics of cities and dates, but you’ll also be able to find September Delaware half marathons by difficulty, scenery, race size, and attributes like whether it’s pet-friendly, stroller-friendly, or has a great finisher party.
If you can’t find the half marathon you’re looking for in Delaware in September, it’s possible the race has not updated their date to the current year or has switched months. If you know a race belongs on this calendar or have any edits you’d like to suggest for an existing race in Delaware in September, you can email us [email protected].
Filter Delaware Half Marathons
Race Size
Difficulty
Scenery
Type
Perfect For
Distances
Filter Delaware Half Marathons
Race Size
Difficulty
Scenery
Type
Perfect For
Distances
Featured Race
January 18, 2026
1,000-10,000 runners
Key West, Delaware
- 5k, Half Marathon, Road
September 28, 2025
100-500 runners
Bear, Delaware
- 10K, Half Marathon, Trail
Running in Delaware
FAQ
What are the most popular Delaware half marathons?
The most popular Delaware half marathon is the Rehoboth Beach Seashore Half Marathon with over 2,000 runners. The second most popular Delaware half marathon is the Coastal Delaware Running Festival in Dewey Beach with over 1,200 finishers.
What’s the best Delaware half marathons for beginners in 2025?
If you’re a beginner looking for a half marathon in Delaware, our favorites to recommend are the Rehoboth Beach Seashore Half Marathon in Rehoboth, a scenic coastal race with great crowds, and the Delaware Half Marathon Running Festival in Wilmington, the state’s oldest road marathon.
Which Delaware cities have half marathons?
