Castle Rocks State Park in Idaho, USA - map and visitor information

Research checked: 2026-11-11. Check linked official notices before travel.

Castle Rocks State Park near Almo, Idaho, combines granite climbing and ranch trails with a campground near City of Rocks National Reserve. Use the shared Almo visitor center for orientation when staff are available. Reserve Smoky Mountain Campground before you arrive if you plan to stay.

Granite routes and a former ranch

Choose the state park for climbing, hiking, mountain biking or horseback riding. The ranch landscape also preserves evidence of earlier travel and 20th-century ranching.

Know before you go

Fees, hours, and seasonal access

Use the Almo approach in winter

The state park recommends approaching via Almo when winter road closures can affect the route from Oakley. If you camp outside the water season, plan to bring your own drinking water.

Follow the leash and camp rules

Keep pets on a leash no longer than six feet. At Smoky Mountain, pitch tents on designated pads. Keep stock animals out of the main campground loop.

Reserve the campground before arrival

A reservation is required year-round for Smoky Mountain Campground and Castle Rocks Ranch campsites. Use the official reservations guide. Campground charges are separate from the day-use fee. Same-day bookings depend on availability. A Smoky Mountain site holds up to eight people, two vehicles and two tents. Only one motorized or towed camping unit with built-in sleeping space is allowed per site. Keep vehicles and equipment within the site boundary and put tents on the designated pads. Check in at 2 p.m. and check out by 1 p.m.

Find the Castle Rocks day-use area

From Almo, use Elba-Almo Road (Highway 77 Spur) to reach Big Cove Road (2800 S). Follow the NPS area map to the Castle Rocks ranch area. The Castle Rocks trail map marks the parking areas and trail connections.

For an optional orientation stop, use 3035 Elba-Almo Road, Almo, ID 83312, for the shared visitor center. From November 1 through April 15, the center normally opens Tuesday through Saturday, 8 a.m.–4:30 p.m. It closes on winter holidays, including November 11, 2026. Check the NPS visitor center hours if you plan to stop. Smoky Mountain Campground is a separate destination near the east entrance of City of Rocks National Reserve.

More stops in southern Idaho

• City of Rocks National Reserve. Get orientation at the same visitor center in Almo. The reserve has separate access and camping rules.
• Lake Cleveland in Sawtooth National Forest. Use Howell Canyon Road from Idaho 77 near Albion. Check seasonal road access before going up the canyon.

Choose a route for your activity

Climbers can choose from established granite routes. Ask the visitor center about conditions and posted closures before choosing a route. Use the Castle Rocks trail map to choose a route for hiking, mountain biking or horseback riding. The state also lists birding and seasonal snowshoeing.

Accessible campsites and visitor information

The Almo visitor center is accessible. Smoky Mountain sites 11 and 24 are designated accessible. The campground guide explains seasonal water and restroom service.

A granite landscape with a ranch history

The park extends onto the east slope of Smoky Mountain, where pinyon pines surround the campground.

Travel and ranching traces

The state park identifies historic trail crossings, Indigenous pictographs and signs of 20th-century ranching in the landscape. Leave cultural features where you find them.

Contact the Almo visitor center

Call 208-824-5901 or check the Idaho park page for conditions.