When hikers ask which trails in District of Columbia are worth a full day — or several — the conversation always circles back to the same handful of routes. Below we've ranked the ten longest hiking trails in District of Columbia by total mapped distance, drawing from the 661 trails OutsideAtlas currently tracks in the state. Each entry includes the distance, what makes the route distinctive, and an honest note on who should actually attempt it.
The District is small and urban, but Rock Creek Park, the C&O Canal towpath, and the Mount Vernon Trail give DC a real hiking footprint. The C&O Canal Towpath (184 miles, terminating in Georgetown) and the Mount Vernon Trail provide most of DC's long-distance mileage. Spring and fall are best; summer humidity is significant; winter trails are quiet but ice-prone.
Our rankings here are data-driven — pulled from the 661 mapped entries OutsideAtlas tracks in District of Columbia — but the data has limits worth being honest about. OpenStreetMap distance tags are crowd-sourced and inconsistent. A route may appear longer or shorter than the official measurement, especially when long-distance trails (like state and national scenic trails) are tagged in segments rather than as a single relation.
The Ranking
Ranked from #1 to #10. Click through any entry for the full trail page — map, elevation profile, weather forecast, and direct OpenStreetMap source link.
#1. ADT - Maryland - Seg 4
At 0.20 mi, ADT - Maryland - Seg 4 tops the list — a route built for hikers who plan in days, not hours. Expect 0.20 mi on a forgiving grade. Local trail-association reports tend to agree this is one of the better-maintained options in the area, which matters more on a hike of this length than on a quick walk. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the ADT - Maryland - Seg 4 trail page →Map, elevation profile, current weather, and OSM source.#2. African American Heritage Park Trail
African American Heritage Park Trail earns the #2 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect wood surface on a forgiving grade. The route is well documented in OpenStreetMap, which is what put it on our radar — community-mapped routes tend to be the ones that get hiked enough to stay open. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the African American Heritage Park Trail trail page →Map, elevation profile, current weather, and OSM source.#3. Arlington Boulevard Trail Connector
Arlington Boulevard Trail Connector earns the #3 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect paved surface on a forgiving grade. It earns its ranking on the data, but trail conditions can change quickly after storms or fire seasons, so verify before you commit a full day. A paved surface makes this one of the more accessible options on the list — good for strollers, mobility aids, and wet-weather days. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Arlington Boulevard Trail Connector trail page →Map, elevation profile, current weather, and OSM source.#4. Crystal City-Potomac Yard Connector
Crystal City-Potomac Yard Connector earns the #4 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect paved surface on a forgiving grade. Compared to similar trails in District of Columbia, this route trades difficulty for either solitude or scenery — sometimes both. A paved surface makes this one of the more accessible options on the list — good for strollers, mobility aids, and wet-weather days. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Crystal City-Potomac Yard Connector trail page →Map, elevation profile, current weather, and OSM source.#5. Mount Vernon Avenue Bridge Sidewalk
Mount Vernon Avenue Bridge Sidewalk earns the #5 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect paved surface on a forgiving grade. What makes this one earn its spot on the list is the combination of mapped detail and the kind of through-and-through experience that justifies a longer drive. A paved surface makes this one of the more accessible options on the list — good for strollers, mobility aids, and wet-weather days. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Mount Vernon Avenue Bridge Sidewalk trail page →Map, elevation profile, current weather, and OSM source.#6. Potomac Heritage National Scenic Trail (right bank)
Potomac Heritage National Scenic Trail (right bank) earns the #6 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Tagged easy in OpenStreetMap. Local trail-association reports tend to agree this is one of the better-maintained options in the area, which matters more on a hike of this length than on a quick walk. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Potomac Heritage National Scenic Trail (right bank) trail page →Map, elevation profile, current weather, and OSM source.#7. Potomac Heritage National Scenic Trail (left bank)
Potomac Heritage National Scenic Trail (left bank) earns the #7 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Tagged easy in OpenStreetMap. The route is well documented in OpenStreetMap, which is what put it on our radar — community-mapped routes tend to be the ones that get hiked enough to stay open. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Potomac Heritage National Scenic Trail (left bank) trail page →Map, elevation profile, current weather, and OSM source.#8. Smithsonian Pollinator Garden Path
Smithsonian Pollinator Garden Path earns the #8 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect paving_stones surface on a forgiving grade. It earns its ranking on the data, but trail conditions can change quickly after storms or fire seasons, so verify before you commit a full day. Rocky tread punishes thin-soled shoes; bring stiff hikers and pace yourself on the descents to spare your knees. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Smithsonian Pollinator Garden Path trail page →Map, elevation profile, current weather, and OSM source.#9. Lincoln Memorial Circle Southwest
Lincoln Memorial Circle Southwest earns the #9 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect concrete surface on a forgiving grade. Compared to similar trails in District of Columbia, this route trades difficulty for either solitude or scenery — sometimes both. A paved surface makes this one of the more accessible options on the list — good for strollers, mobility aids, and wet-weather days. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Lincoln Memorial Circle Southwest trail page →Map, elevation profile, current weather, and OSM source.#10. Rhode Island Avenue Trolley Trail
Rhode Island Avenue Trolley Trail earns the #10 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect asphalt surface on a forgiving grade. What makes this one earn its spot on the list is the combination of mapped detail and the kind of through-and-through experience that justifies a longer drive. A paved surface makes this one of the more accessible options on the list — good for strollers, mobility aids, and wet-weather days. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Rhode Island Avenue Trolley Trail trail page →Map, elevation profile, current weather, and OSM source.Planning your District of Columbia trip
A few pieces of context are worth keeping in mind specifically for District of Columbia. Spring and fall are best; summer humidity is significant; winter trails are quiet but ice-prone. Ticks in Rock Creek Park and the urban-wildlife interface (deer, coyote) are the modest concerns.
Always cross-reference the official land-manager page before driving out — closures, fire restrictions, and seasonal road access can change quickly. Our trail pages link directly back to the OpenStreetMap source so you can see the tags we're working from.
If you're new to hiking generally, our beginner's guide covers footwear, layering, and the day-pack basics. For safety planning on bigger objectives, the ten essentials guide is worth twenty minutes of reading.
More District of Columbia hiking guides
If you found this useful, the rest of our District of Columbia coverage continues below.
- Steepest trails in District of Columbia — Hikes with the most elevation gain in the state.
- Best beginner hikes in District of Columbia — Easy, well-marked trails for first-time hikers.
- Most challenging hikes in District of Columbia — Expert-rated routes for experienced hikers only.
- Best national parks in District of Columbia — Federal parks and recreation areas ranked.
- Best waterfall hikes in District of Columbia — Trails leading to named falls, ranked by accessibility.
- Best dog-friendly hikes in District of Columbia — Where leashed dogs are explicitly welcome.
- Best family hikes in District of Columbia — Short, easy trails sized for kids and grandparents.
Rankings like this are starting points, not verdicts. Trail conditions change, new routes get tagged, and what was the toughest trail in District of Columbia last year might not be next year. We refresh these articles when the underlying data shifts meaningfully.
Got a correction, a route we missed, or a question? Drop us a note via the contact page. We read every email and we'd rather hear it from you than miss it.
