> Canonical: https://marylandparks.org/trails/appalachian-trail-osm-18330829
> Content revision: 2026-10-19T18:56:48.919Z

HIKING ROUTE

# Appalachian Trail

Frederick · Washington · approximately 39.6 mapped miles in Maryland

[Frederick parks ↗](https://marylandparks.org/counties/frederick)[Washington parks ↗](https://marylandparks.org/counties/washington)

## The mapped route.

Only the mapped Maryland portions are shown. Mileage is estimated from those lines, including mapped branches, and may differ from an official trail length. Disconnected lines are not instructions to cross unmapped land.

[View this route on OpenStreetMap ↗](https://www.openstreetmap.org/relation/18330829)

## Plan before you walk.

**Mapped distance**: 39.6 miles in Maryland; approximate

**Route type**: Hiking route

**OSM walking network**: National

This route comes from community-maintained map data. Access, trail condition, difficulty, seasonal restrictions, and the route’s continuity have not been independently verified. Follow current official maps, signs, and closures.

## Parks along the mapped route.

Links indicate a mapped boundary overlap, not confirmation that the park manages every segment.

[Appalachian National Scenic Trail ↗](https://marylandparks.org/parks/appalachian-national-scenic-trail)[C & O Canal National Historical Park ↗](https://marylandparks.org/parks/c-and-o-canal-national-historical-park)[Gathland State Park ↗](https://marylandparks.org/parks/gathland-state-park)[Greenbrier State Park ↗](https://marylandparks.org/parks/greenbrier-state-park)[South Mountain State Park ↗](https://marylandparks.org/parks/south-mountain-state-park)[Washington Monument State Park ↗](https://marylandparks.org/parks/washington-monument-state-park)[Weverton-Roxbury Rail Trail ↗](https://marylandparks.org/parks/weverton-roxbury-rail-trail)

## Notices from parks along this route.

Each notice retains its own park, area, or regional scope. These notices do not establish a closure of the entire trail.

Visitor advisoryTrails & roadsSource check overdue

### Greenbrier State Park: visitor notice

Park-specific information

- [Greenbrier State Park](https://marylandparks.org/parks/greenbrier-state-park)

New electronic entry gate in use.Starting Friday, May 1, 2026, the new electronic entry gate at Greenbrier State Park will be in use. Visitors will use this gate when the toll booth is unmanned. The gate only accepts credit card. If you currently hold a Maryland Annual State Park and Trail Passport, a Maryland Golden Age Pass, or a Maryland Universal Disability Pass or are in the military or a veteran, please reach out to the park for instructions on how to receive a gate pass. Campers will receive gate instructions upon checking in for their reservation.A temporary closure is now in effect for a portion of the Big Red Trail on the west side of Greenbrier Lake due to dam infrastructure improvements. The section of trail along the backside of the lake will be closed for walking and the dam area will be inaccessible for boating and fishing. Visitors should follow posted signage and use alternate trail routes until work is complete.

[Read the official notice: Maryland park status dashboard ↗](https://dnr.maryland.gov/Pages/park-status-dashboard.aspx)Source checked Oct 15, 2026

## Source & map data

Trail data © [OpenStreetMap contributors](https://www.openstreetmap.org/copyright), under the [Open Database License (ODbL)](https://opendatacommons.org/licenses/odbl/1-0/). [OSM relation 18330829](https://www.openstreetmap.org/relation/18330829) · source snapshot Oct 19, 2026 · imported Oct 19, 2026.

[Download this trail geometry (GeoJSON)](https://marylandparks.org/data/trails/osm-relation-18330829.geojson) · [Markdown version](https://marylandparks.org/trails/appalachian-trail-osm-18330829.md) · [Suggest a correction](https://marylandparks.org/about#corrections)