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Hiking trails & Routes
United States
New Hampshire
Coos County

Unknown Pond Trail

Moderate

4.8

(6861)

9,057

hikers

Unknown Pond Trail

01:26

3.61km

430m

Hiking

The Unknown Pond Trail offers a moderate hiking experience through varied forest, starting with open woods and transitioning into beautiful birch glades, particularly striking in autumn. You'll follow a brook, which can be wet and muddy in places, before the path begins its steeper ascent. This 2.2-mile (3.6 km) route involves a significant elevation gain of 1417 feet (432 metres), typically taking about 1 hour and 25 minutes to complete. Your reward is the secluded Unknown Pond, a tranquil tarn nestled below The Horn, where you can enjoy peaceful views of the peak reflected in its waters.

Access to the trailhead is usually via Mill Brook Road, a dirt road that is subject to seasonal closures, so always check current conditions before you plan your trip. Keep in mind that while the listed stats are for a segment, an out-and-back hike to Unknown Pond usually extends to about 4.6 miles round-trip and takes closer to 2.5 hours. If you're considering an overnight adventure, designated tent sites and an outhouse are available at the pond.

This trail is situated within New Hampshire's expansive White Mountain National Forest, an area renowned for its natural beauty and diverse ecosystems. The journey through different forest types, from open woods to birch glades, showcases the region's rich flora. Unknown Pond itself is a classic tarn, a mountain lake formed by glacial activity, adding a geological point of interest to your hike. It's a great option if you're looking for a peaceful escape into the heart of the White Mountains.

Last updated: April 23, 2026

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1

3.40 km

Unknown Pond

Highlight • Lake

Unknown Pond is a small reservoir in White Mountain National Forest. There are some primitive backcountry campsites and a picnic area near the water, making this a great spot for a break. This is also a great spot for viewing wildlife.

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3.61 km

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Way Types & Surfaces

Way Types

3.58 km

< 100 m

Surfaces

3.57 km

< 100 m

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Weather

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Today

Monday 17 August

22°C

16°C

77 %

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Max wind speed: 4.0 km/h

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Frequently Asked Questions

Where can I park for the Unknown Pond Trail?

The primary access point for the Unknown Pond Trail is via Mill Brook Road, which leads to the trailhead. Please note that Mill Brook Road is a dirt road and is seasonally closed, typically during winter months. Check local forest service updates for current road conditions before planning your trip.

Is the Unknown Pond Trail dog-friendly?

Yes, the Unknown Pond Trail is dog-friendly. Dogs are generally allowed in the White Mountain National Forest, but they must be kept on a leash at all times to protect wildlife and ensure a pleasant experience for all hikers.

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

The trail offers different experiences throughout the year. Spring can be wet and muddy, especially after snowmelt. Summer provides lush greenery. Autumn is particularly scenic with vibrant birch glades. Winter transforms the area into a 'winter wonderland' around Unknown Pond, though winter hiking requires appropriate gear and experience.

Are there any permits or fees required to hike in the White Mountain National Forest?

For day hikes in the White Mountain National Forest, permits are generally not required. However, some trailheads or parking areas may require a recreation pass (such as the America the Beautiful Pass or a local White Mountain National Forest pass). It's always best to check the specific requirements for the Mill Brook Road trailhead before you go.

How challenging is the Unknown Pond Trail and how long does it typically take?

The Unknown Pond Trail is generally rated as moderate. The out-and-back hike to Unknown Pond is approximately 4.6 miles round-trip with an elevation gain of about 1400 feet. Most hikers complete this section in about 2.5 hours. The initial mile is relatively easy, becoming steeper as you approach the pond.

What kind of terrain and scenery can I expect on the trail?

The trail begins by following a brook, passing a small cascade. Expect potentially wet and muddy sections, especially lower down. It ascends through open forest, transitioning into beautiful birch glades, and then into darker spruce and fir trees higher up. The main scenic highlight is the secluded Unknown Pond, offering magnificent views of The Horn.

What can I see along the route?

The primary destination and highlight is Unknown Pond itself, a serene tarn nestled in the forest with views of The Horn. Along the way, you'll experience diverse forest types, from open woods to stunning birch glades. While extensive long-distance views are not common directly on the trail, the forest scenery is very pleasant.

Does the trail connect to other hiking routes?

Yes, the Unknown Pond Trail connects with other well-known paths. It intersects with sections of the Cohos Trail and the Kilkenny Ridge Trail, allowing for longer and more challenging loop options to summits like The Horn, The Bulge, and Mount Cabot for experienced hikers.

Are there options for an overnight stay near Unknown Pond?

Yes, Unknown Pond offers designated tent sites and an outhouse, making it a suitable and popular spot for an overnight backpacking trip. Remember to practice Leave No Trace principles.

What should I pack for a hike on this trail?

Given the moderate difficulty and varied terrain, pack essentials like sturdy hiking boots, layers of clothing, rain gear, plenty of water, snacks, a map and compass (or GPS device), and a first-aid kit. Insect repellent is also recommended, especially during warmer months. If hiking in winter, bring appropriate cold-weather gear and traction devices.

Is the Unknown Pond Trail suitable for families with children?

The initial mile of the trail is relatively easy, which might be suitable for families with younger children. However, the trail becomes steeper and potentially muddy closer to Unknown Pond. Families with older, more experienced children who are comfortable with moderate climbs should find it enjoyable. Consider the round-trip distance and elevation gain when planning with children.

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