Hillside to Hollow Reserve
Hillside to Hollow Reserve is a 260-acre oasis of open space surrounded on all sides by Boise neighborhoods. Views of Boise's North End and the Owyhee Mountains in the distance can be seen from trails on the south side of the reserve. Views found here are some of the best in the Ridge to Rivers system. The area is jointly managed by the City of Boise and the Land Trust of the Treasure Valley.
Conditions
No specific conditions or closures to report.
Review our full log of trail Condition Reports for the most current information.

Projects
Harrison Hollow Loop Fencing
A new all-weather trail loop was installed at Hillside to Hollow in 2024. When all-weather trails are installed, the trail surface is replaced with road mix and the excavated material is spread along the side of the trail. The excavated materials are native soils and vegetation can naturally germinate in the soles that become established. Throughout fall and winter, this area has been heavily trafficked by dogs and people inhibiting the regrowth of vegetation. Without additional measures, the soil will continue to compact from off-trail traffic, and vegetation may never be able to grow back.
To stop off-trail traffic and allow the trailside to revegetate, a temporary fence was installed along the new all-weather trail. After the fence is installed, the disturbed areas will be seeded with grasses.
Staying off the newly seeded grasses is critical to help them establish for the following reasons:
- Avoiding soil compaction - grass roots cannot penetrate hard compacted soils.
- Preventing seed displacement - foot traffic can displace newly planted seeds which prevents them from settling into the soil. Displaced seeds will fail to germinate.
- Minimizing damage to tender seedlings - newly germinated seedlings are delicate and can easily be damaged by off-trail dogs and people.
- Preventing erosion - off-trail foot traffic disturbs soils, especially on slopes where water is prone to runoff. Grass roots can hold soil in place but require sufficient time to develop a strong root system.
Hillside to Hollow is a natural area managed for wildlife habitat and recreational access. To preserve Hillside to Hollow for future generations, please temporarily leash dogs along the project area and do not disturb seeded areas.
Featured Trails
Active Filters:
Parking
Hillside to Hollow Reserve can be accessed from a handful of locations.
- Hillside Park - 4150 N. 36th St - 60 paved parking spots, 1 paved ADA van accessible spot
- Harrison Hollow - 2690 N Harrison Hollow Ln. - 25 paved parking spots, 1 paved ADA van accessible spot | Bus Route 10, W Hill Road and N Bogus Basin Road
- Ussery Street - Start of West Climb Trail #55 - unpaved parking area, 3-4 vehicles
Dogs must be on-leash in bot Hillside Park and the Harrison Hollow Lane Trailhead parking lot.
Restrooms
Restrooms are available at both the Hillside Park and Harrison Hollow Lane Trailhead parking areas.
Trail notes
- Harrison Hollow Lan Trailhead amenities include drinking fountain and dog watering station, and bike racks
- Great for dogs
- Hikes and runs
- Great views
Full Sail is the latest addition to the Reserve's trails. Built in 2016, it links Hillside Park on the west side of the Reserve, with the numerous trails originating from the Harrison Hollow and Ussery trailheads. It provides an easy, meandering experience that looks out just above the north end treetops.
Harrison Hollow is a mecca for dogs. It is a gentle stroll up the drainage where you can expect to encounter man friendly regulars with their pets. This trail contains a sand and gravel surface, allowing it to be useable when most other trails are not due to muddy conditions. Short loops can be made by returning via either Harrison Ridge #58 or Who Now Loop #51.
These trails are native surfaced and as such should not be used when conditions are muddy.