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Hiking trails & Routes
United States
Missouri
St. Louis County

Grotpeter Trail Loop

Easy

3.0

(18)

58

hikers

Grotpeter Trail Loop

01:55

7.14km

90m

Hiking

The Grotpeter Trail Loop in Castlewood State Park offers a varied and engaging hike, covering 4.4 miles (7.1 km) with 286 feet (87 metres) of elevation gain. You'll experience everything from gentle climbs and rolling forested sections to the challenging, rooted descent and ascent of "Cardiac Hill." This easy-rated route, taking around 1 hour and 55 minutes, provides scenic views of Kiefer Creek and bluffs, making it a dynamic outdoor experience.

Planning your visit is straightforward; the trail is accessible year-round, with spring and autumn being particularly beautiful for wildflowers and fall foliage. It's a popular multi-use path, welcoming hikers, mountain bikers, and trail runners, and is also dog-friendly as long as your pet is on a leash. The Grotpeter Trail Loop connects to several other paths in the park, allowing for customized routes.

This trail is a prominent feature of Castlewood State Park's extensive system, known for its diverse terrain that caters to various skill levels. Its unique features like "Cardiac Hill" and the

Last updated: June 9, 2026

Waypoints

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Parking

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1

1.84 km

Grotpeter Trail

Highlight (Segment) • Trail

The Grotpeter Trail is the most northern trail in the Castlewood State Park trail system. The twists and turns remind you of why so many mountain bikers love these trails, but they are perfect for a forest hike as well. The trails are pretty well-marked in this part of the park, and you'll have several options to branch off of this main trail onto some of the other shorter trails in the area.

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7.14 km

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Parking

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Way Types & Surfaces

Way Types

7.10 km

< 100 m

Surfaces

7.10 km

< 100 m

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Elevation

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Highest point (190 m)

Lowest point (120 m)

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Weather

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Today

Thursday 9 July

31°C

22°C

72 %

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Max wind speed: 9.0 km/h

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Frequently Asked Questions

How long does it typically take to hike the Grotpeter Trail Loop?

The Grotpeter Trail Loop is approximately 7.1 km (4.4 miles) long. Most hikers complete it in about 1 hour and 55 minutes, depending on their pace and how often they stop to enjoy the scenery.

What kind of terrain can I expect on this trail?

You'll find varied terrain on the Grotpeter Trail. It starts with a mellow climb, transitions into switchbacks, and includes a steeper ascent. Expect good rolling trail and hardpack sections, as well as a fun, steep, and rooted downhill leading to a rutted climb up 'Cardiac Hill.' There's also a 'rollercoaster' area with undulating ups and downs through trees, and a pleasant stretch along Keifer Creek.

Is the Grotpeter Trail Loop suitable for beginners?

While generally considered intermediate, the trail can be challenging in sections, particularly 'Cardiac Hill' with its steep, rocky descent and ascent. It's suitable for various fitness levels, but beginners should be prepared for some strenuous parts. It's also popular for trail running and mountain biking, indicating its accessibility for different outdoor enthusiasts.

What are the scenic highlights along the route?

The trail offers beautiful natural views through scenic woods, bluffs, and glimpses of the Meramec River. Initial climbs provide nice views of the creeks, and the section along Keifer Creek is particularly lovely. Keep an eye out for wildlife, especially near the water. The trail itself, known as the Grotpeter Trail, is a highlight in its own right.

What wildlife might I encounter on the Grotpeter Trail Loop?

The trail offers opportunities to observe local wildlife, particularly along the banks of Keifer Creek where animals come to drink. While specific species aren't guaranteed, you might spot various birds, small mammals, and other creatures common to Missouri's woodlands and riverine environments.

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

The Grotpeter Trail Loop can be enjoyed year-round. Spring brings lush greenery and wildflowers, while autumn offers vibrant fall foliage. Summer is popular but can be hot and humid, so an early start is recommended. Winter hiking is also possible, but be mindful of potential icy conditions on steeper sections.

Does the Grotpeter Trail Loop connect with other trails?

Yes, the Grotpeter Trail Loop is a prominent feature within Castlewood State Park and interconnects with several other paths. The route also passes through sections of the White Connector 2, White Connector 4, White Connector 5, Lone Wolf Trail, White Connector 3, Connector Trail, White Connector 1, White Connector 6, Riverscene Trail, and River Scene Trail, allowing for customized routes and distances.

Is the Grotpeter Trail Loop dog-friendly?

Yes, the Grotpeter Trail Loop is dog-friendly. However, dogs must be kept on a leash at all times to ensure the safety and enjoyment of all park visitors and wildlife.

Are there any fees or permits required to hike in Castlewood State Park?

Castlewood State Park, where the Grotpeter Trail Loop is located, generally does not require entrance fees for day use. However, it's always a good idea to check the official Missouri State Parks website for the most current information regarding any potential fees or regulations before your visit.

Where can I park for the Grotpeter Trail Loop?

Parking is available within Castlewood State Park. The Grotpeter Trail Loop is a well-known route, and there are designated parking areas that provide access to the trailhead. It's advisable to arrive early on busy days, especially weekends, to secure a spot.

What should I wear or bring for this hike?

Given the varied terrain and intermediate difficulty, wear sturdy hiking shoes with good ankle support. Bring plenty of water, especially during warmer months, and snacks. Sunscreen, insect repellent, and a map or GPS device are also recommended. Layers are always a good idea as weather conditions can change.

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