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Hiking trails & Routes
United States
California
Siskiyou County

Castle Lake Trail #4W02

Moderate

2.8

(9)

32

hikers

Castle Lake Trail #4W02

00:35

1.34km

130m

Hiking

Embark on the Castle Lake Trail #4W02, a moderate hike that covers 0.8 miles (1.3 km) and climbs 425 feet (130 metres) in about 35 minutes. As you ascend, you'll quickly leave the main lake behind, entering peaceful pine forests. The path can be rocky, but the effort is rewarded…

Last updated: April 23, 2026

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Waypoints

A

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Parking

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1

385 m

Castle Lake

Highlight • Lake

This stunning glacial lake is a popular destination for hiking, camping, and even fishing. From here you can climb up to Heart Lake and enjoy some amazing views of Mount …

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1.34 km

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Way Types & Surfaces

Way Types

1.29 km

< 100 m

Surfaces

1.29 km

< 100 m

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Elevation

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Weather

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Today

Thursday 28 May

18°C

4°C

78 %

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Max wind speed: 8.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

How long does it typically take to hike this trail?

The specific Komoot tour for Castle Lake Trail #4W02 is estimated to take approximately 35 minutes to complete. However, the full trail system can be much longer, ranging from 8.1 to nearly 11 miles round trip depending on your destination, such as Mount Bradley Lookout, which would take considerably more time.

What is the terrain like on the Castle Lake Trail #4W02?

The trail offers diverse terrain. It starts near Castle Lake, potentially crossing a small delta and Castle Lake Creek where your feet might get wet. It then ascends through pine forests, becoming rocky with tree roots, leading to a saddle. Further along, you'll encounter eroded sections, a lush meadow, and a climb to a ridge with expansive views. The surfaces are often rocky and uneven, with evidence of glacial scoring.

Is the Castle Lake Trail #4W02 suitable for beginners?

This trail is generally considered moderate to challenging, suitable for experienced hikers due to significant elevation gain and rocky, uneven surfaces. It's not recommended for beginners. If you're looking for an easier option in the area, the shorter Castle Lake Shore Trail (about 1 mile round trip with negligible elevation) might be more appropriate.

Where does the trail start and where can I park?

The trail begins near Castle Lake in the Shasta-Trinity National Forest. Parking is available at the Castle Lake trailhead. It's advisable to arrive early, especially during peak season, as parking can fill up quickly.

Are dogs allowed on the trail?

Yes, dogs are generally allowed on trails within the Shasta-Trinity National Forest, including Castle Lake Trail #4W02. However, they must be kept on a leash to protect wildlife and ensure a pleasant experience for all hikers. Always practice Leave No Trace principles and pack out all pet waste.

Do I need a permit or is there an entrance fee for the Shasta-Trinity National Forest?

Typically, there are no entrance fees to access the general areas of the Shasta-Trinity National Forest for day hiking. However, specific activities or certain developed recreation sites might require a permit or fee. For this trail, a wilderness permit is not generally required for day use, but it's always a good idea to check the official Shasta-Trinity National Forest website for the most current regulations before your visit.

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

The trail offers year-round beauty, but the best time for hiking is generally from late spring through early fall (June to October) when snow has melted and conditions are most favorable. Even in early summer, you might encounter patches of snow and ice at higher elevations. Winter hiking is possible but significantly more challenging and requires appropriate gear and experience.

What notable features or viewpoints can I expect along the way?

This trail is renowned for its spectacular views. You'll pass Castle Lake, and from a saddle above it, you can see Mount Shasta beyond Little Castle Lake. Further along, the ridge offers expansive, uninterrupted vistas of Mount Shasta, the Klamath Mountains, the Eddy Range, and the dramatic Castle Crags Wilderness. You might also encounter a small tarn and lush meadows.

Does the trail intersect other well-known paths?

Yes, the route for Castle Lake Trail #4W02 intersects with or runs concurrently with sections of other trails. Specifically, it covers 100% of the official Castle Lake Trail #4W02, and also includes parts of the Castle Lake Trail #4W02 (Little Castle Lake / Mt Bradley), Heart Lake Trail, and Castle Shore Trail #5W06.

What should I bring for a hike on this trail?

Given the challenging and varied terrain, sturdy, ankle-bracing footwear is highly recommended. Bring plenty of water, snacks, and layers of clothing as weather can change quickly. A downloaded map is advisable as some parts of the path may be overgrown or have fallen logs, making navigation challenging. Sun protection and basic first-aid supplies are also essential.

Are there opportunities for swimming along the trail?

Yes, there are opportunities for swimming in the warmer months. You can swim in Castle Lake, and the trail also provides access to Little Castle Lake and Heart Lake. Heart Lake is known to warm up with the weather due to its shallow depth, making it a popular spot for a dip.

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