The U.S. National Arboretum hosts FONA's Flowering 5K, a running or walking event through a scenic 451-acre urban space featuring vibrant spring flowers like cherry blossoms and magnolias. The route is car-free for participant safety, with professional race announcing and music enhancing the experience. Strollers and leashed dogs are welcome. Veterans can register for free, while military members and FONA members receive discounts. Adult registration includes a t-shirt, and youth shirts are available for purchase.