The Adventure Hiking Trail (AHT) is a rugged 24-25 mile backpacking loop through the forested ridges and river bluffs of Harrison-Crawford State Forest and O'Bannon Woods State Park in southern Indiana, and the state's best-known backpacking route. The trail takes in Ohio River overlooks, deep hardwood ravines, limestone cliff formations, sinkholes, and remnants of pioneer homesteads. A designated National Recreation Trail, the AHT is a physically demanding weekend trip with real solitude and varied scenery. Its steep climbs and descents, often straight shots up and down ridgelines that have eroded into stream beds, demand solid fitness and careful footing. Most backpackers complete the loop in 2.5-3 days, though ultralight hikers have pushed it in under 24 hours.
No advance permit or reservation is required for backpacking the Adventure Hiking Trail. However, both O'Bannon Woods State Park and Harrison-Crawford State Forest charge entrance fees: $7/day for Indiana residents and $9/day for out-of-state visitors. Registration is not required at Harrison-Crawford State Forest (unlike Morgan-Monroe and Yellowwood state forests).
Camping is permitted only along the Adventure Hiking Trail, nowhere else in these properties. Stays are limited to 14 consecutive days with a maximum group size of 6 persons per campsite. Four shelters along the route are first-come, first-served and available only to AHT backpackers. Dispersed primitive camping is allowed in the Harrison-Crawford State Forest sections but not within O'Bannon Woods State Park boundaries.
Campfires must be built in pits no larger than 12 inches in diameter with a 3-foot radius cleared down to mineral soil. Check Indiana's statewide burn ban map before your trip, as Harrison and Crawford counties may impose seasonal fire restrictions. Pack out all trash; Leave No Trace principles apply.
The best hiking windows are March through May and September through October. Spring (late April-May) has wildflower blooms, comfortable temperatures in the 50s-70s°F, and flowing creeks, though mud is common, and even recent rainfall only raises the already minimal water sources slightly. Fall (September-October) brings crisp air, good foliage, fewer bugs, and the most reliable weather, with temperatures from the 40s-70s°F.
Summer (June-August) is hikeable but hot, humid, and buggy. Expect temperatures in the 75-90°F range, high humidity, ticks, mosquitoes at dawn and dusk, and completely dry water sources. Winter hiking is possible and popular with experienced backpackers; the trail is described as "most runnable from late fall through late spring." Wind and ice storms can drop trees across the trail any time of year, but in winter you get solitude and long ridge views once the foliage is down. Be prepared for freezing temperatures, possible snow and ice, and difficult footing on steep slopes.
Water is the AHT's biggest challenge. There are little to no reliable natural water sources along the trail, even after heavy rain. Hikers report streams bone-dry in summer, with only occasional stagnant pools. Trip reports consistently emphasize the same advice: cache water at road crossings or carry everything you need.
The trail crosses roads five times, which makes caching straightforward:
- Highway 462
- Old Forest Road
- Cold Friday Road (highly recommended cache spot)
- Highway 62 (near old iron bridge)
- Near Pioneer Cabin Shelter
Many backpackers stash gallon jugs at multiple crossings before starting. Plan for at least 3-4 liters per person per day depending on season and exertion level. No resupply towns are accessible mid-trail. Corydon, the nearest town at 10-15 minutes by car, has grocery stores and gas stations, but you'll need a vehicle to reach them from the trailheads.
The AHT's steep terrain is its defining feature and primary hazard. Ascents and descents run straight up and down the slopes, forming eroded gullies filled with loose gravel, mud, and leaves where secure footing is difficult. Expect to use your hands on the steep sections. Fallen trees and logs may block the trail at any time; maintenance is minimal.
Ticks are prevalent from spring through fall. Treat clothing with permethrin and check yourself thoroughly each day. Poison ivy grows along the forest floor and up tree trunks. Mosquitoes swarm at dawn and dusk during warm months.
Navigation requires attention. The trail is marked with white and green blazes, but markers can be hard to find where trees have fallen or in recently logged areas. One common mistake is missing a 90-degree turn between Highway 462 and Old Forest Road. The AHT also intersects multiple horse trails, and it is easy to follow the wrong path. Download offline maps before starting.
There are no significant creek crossings, river fords, or lightning exposure of the kind alpine trails have, but the rugged, remote terrain and limited water make self-sufficiency essential. Cell service is spotty to nonexistent.
The Adventure Hiking Trail is near Corydon, Indiana, approximately 25 miles (30 minutes) northwest of Louisville, Kentucky. Louisville International Airport (SDF) is the nearest major airport, 35 miles from Corydon with direct flights from most US hubs.
From Louisville, take I-64 West into Indiana, then follow signs toward Corydon and the state forest. The loop has multiple access points along Highway 462, Old Forest Road, and Highway 62. No high-clearance vehicle is required; the standard forest roads are passable in dry conditions, though mud can be a problem after rain.
No public transit or shuttle services operate to the trailheads. Parking is available at O'Bannon Woods State Park (entrance fee required) and various forest road intersections. Since this is a loop, most backpackers park at one trailhead and return to the same spot after 2-3 days.
Start early on Day 1 so you reach your first shelter or camping spot with daylight to spare; navigating dense forest at dusk is difficult. The southern section along the Ohio River has the best scenery, so plan your itinerary to hit those bluffs in good light.
Shelter strategy: The four shelters (including Ohio River Shelter, Old Barn Shelter, and Pioneer Shelter) are first-come, first-served. Arrive by mid-afternoon to claim a spot, especially on weekends. Shelters provide only a roof, so bring a sleeping pad and be prepared to tent camp if they're full.
Cache water logistics: Drive the loop beforehand if possible, stashing water at 2-3 road crossings. Cold Friday Road is the most popular cache location. Use opaque containers and hide them off-road to avoid theft.
Gear considerations: Trekking poles are highly recommended for the steep descents. Ankle-high boots give better support than trail runners on loose, rocky slopes. Pack permethrin-treated clothing and bug repellent for spring and summer trips. A water filter is useful only if you're willing to gamble on finding water; don't rely on it.
Avoid holiday weekends (Memorial Day, Fourth of July, Labor Day), when shelters fill quickly and the trail sees more traffic. For solitude and the best conditions, target weekdays in late April or early October.
The trail is well-marked overall, but download the official Indiana DNR map PDF and bring a compass or GPS device. The figure-eight configuration around Indian Lake and Lake Celina allows shorter 12-15 mile loops if you want to test the terrain before committing to the full 25 miles.
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