Happy Halloween: Best Run Costumes!

Women's Running readers aren't afraid to have a little fun while celebrating Halloween! Check out our gallery of reader race costumes!

In honor of the day’s festivities, we called on Women’s Running readers to share their best race costume photos. Check out these fierce run-girls, who aren’t afraid to show their playful sides!

Which costume is your favorite? Let us know here or tweet us @WomensRunning!