U.S. National Arboretum Loop and Azalea Hills

The U.S. National Arboretum at 3501 New York Ave NE in northeast Washington, DC covers about 446 acres of gardens, groves and meadows managed by the U.S. Department of Agriculture. Walkers can combine interior roads and paths into a loop of about 3 to 5 miles (4.8 to 8 km), taking roughly 1.5 to 2.5 hours, with total elevation gain around 150 ft (46 m). The terrain is rolling, and the route is easy for most visitors. The arboretum is reached by car, with free parking inside the grounds, or by Metrobus B2 to Bladensburg Rd and R St NE, from which a short walk reaches the entrance. The main number is +1-202-245-2726, and entry is free, with no permit required. The surface is mostly paved road and mown paths, so footing is easy, though some garden paths are gravel or grass. Shade varies from open meadows to dense groves of conifers and hardwoods. The best-known stop is Azalea Hills, which bursts into bloom in April, while other highlights include the Asian Collections, the National Bonsai and Penjing Museum, the Capitol Columns and the Anacostia River views from the edge of the property. The most natural turnaround points are the Asian Collections overlook and the Capitol Columns meadow, and shorter loops can be built around the visitor center. Water and restrooms are available at the visitor center, and picnic areas provide places to rest, but shelter on the paths is limited to tree cover. Because the grounds are enclosed and well signed, bail-out is simple, and the road network allows hikers to cut routes short. Opening hours are posted by the arboretum and should be checked before visiting.