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Routes
Hiking trails & Routes
Cassia County

Backyard Boulders Trail Loop

Routes
Hiking trails & Routes
Cassia County

Backyard Boulders Trail Loop

Easy

Backyard Boulders Trail Loop

00:44

2.60km

60m

Hiking

Easy 1.6-mile loop through ancient geological formations and historical sites in Castle Rocks State Park, perfect for families.

Last updated: February 26, 2026

Waypoints

A

Start point

Parking

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1

759 m

Shock and Awe Shelter

Highlight • Cave

A pre-historic human shelter with artifacts dating to 660AD.

Tip by

2

1.06 km

Three Pool Boulders

Highlight • Natural Monument

A unique set of boulders along the trail.

Tip by

3

1.74 km

A viewpoint overlooking the entire Stines Creek area.

Tip by

4

2.23 km

View of the Valley

Highlight • Viewpoint

5

2.29 km

Pictographs at Castle Rocks State Park

Highlight • Historical Site

Ancient pictographs left by early Native Americans can be seen. Castle Rocks State Park was home to Native Americans for hundreds of years before Europeans made their way across the Atlantic Ocean.

Tip by

6

2.58 km

View across the park from Stines Creek Picnic Area

Tip by

B

2.60 km

End point

Parking

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Way Types & Surfaces

Way Types

2.56 km

< 100 m

Surfaces

1.41 km

1.15 km

< 100 m

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Elevation

Elevation

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Weather

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Saturday 9 May

18°C

5°C

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This route was planned by komoot.

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Frequently Asked Questions

Is this trail suitable for beginners or families with children?

Yes, the Backyard Boulders Trail Loop is considered an easy hike with a gentle grade, making it ideal for beginners and families with children. It's a great way to explore the unique geology of Castle Rocks State Park.

What are the parking options for the Backyard Boulders Trail Loop?

The trail is located within Castle Rocks State Park. Parking is typically available at designated areas within the park. Specific trailhead parking information can often be found on the official park website or local visitor guides.

Do I need a permit or pay an entrance fee for Castle Rocks State Park?

Yes, as the trail is located within Castle Rocks State Park, standard Idaho State Park entrance fees apply. You may need to purchase a day pass or have an annual state park pass. For the most current information on fees and any required permits, it's best to check the official Idaho State Parks website or contact the park directly.

Is the trail dog-friendly?

Generally, dogs are allowed on trails in Idaho State Parks, but they must be kept on a leash. Please ensure you clean up after your pet to help keep the park pristine. Always check the latest park regulations before your visit, as policies can change.

What is the best time of year to hike this loop?

The trail offers different experiences throughout the year. Late spring is excellent for seeing wildflowers and migratory birds as Stines Creek swells. Autumn provides a vibrant display of colorful foliage from aspen, chokecherry, and willow trees. While accessible year-round, conditions can vary with snow in winter.

What is the terrain like on the Backyard Boulders Trail Loop?

The terrain primarily consists of packed dirt, making for a relatively smooth and easy walking surface. It winds around impressive geological formations, offering clear paths and excellent views of the surrounding boulders and landscape.

What unique geological features or historical sites can I find here?

This trail is rich in both geology and history. You'll encounter the impressive Three Pool Boulders, known for their large panholes. The route also passes the Shock and Awe Shelter, a prehistoric rock shelter, and ancient Pictographs at Castle Rocks State Park, offering a glimpse into thousands of years of human history.

Does the loop connect with other trails?

Yes, the route also passes through sections of the Over-the-Rock Trail, North Spur Approach, Crack House Approach, Hostess Gully trail, Shock and Awe Shelter trail, Big Time trail, and Fruit Pie trail. This offers opportunities to observe climbers or explore further if you wish.

What kind of views can I expect along the way?

The trail offers fantastic panoramic views. You'll get some of the best views of the ancient geology within Castle Rocks State Park, including the towering Castle Rock. Key viewpoints include the View of Castle Rocks Geological Area, View of the Valley, and a View of the Albion Mountains from Stines Creek Picnic Area.

What makes this trail a must-do in Castle Rocks State Park?

This trail stands out for its unique combination of accessible hiking, stunning ancient geological formations, and significant archaeological sites. It offers 360-degree views of extensive boulder formations and provides a rare opportunity to see prehistoric pictographs and rock shelters, making it a culturally rich and visually rewarding experience for all ages.

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