3.2
(21)
55
hikers
Acid Canyon Loop
00:55
3.28km
60m
Hiking
The Acid Canyon Loop offers a refreshing, accessible hike through diverse terrain just minutes from downtown Los Alamos. You'll navigate a mix of bedrock fire road and natural paths, winding through open pine stands and descending into the canyon for scenic views. This family-friendly route is an easy 2.0 miles (3.3 km) long with 203 feet (62 metres) of elevation gain, taking about 54 minutes to complete, and provides a moderate workout on its ascent.
To plan your visit, be aware that the trailhead can be a bit hard to find, so GPS is a good idea. Wear sturdy shoes for the uneven sections and carry water, especially during summer when thunderstorms are possible. It's also worth noting that there have been discussions about potential radiation concerns in the area, which you should research before your trip.
Historically significant, the trail system was built around 1920 by the Los Alamos Ranch School, and the area's unique geography played a role in the Manhattan Project. It's a great way to experience the natural beauty and historical context of Los Alamos, offering canyon views and diverse plant life like ponderosa pine and mountain mahogany.
Last updated: June 9, 2026
Waypoints
Start point
Parking
Get Directions
947 m
Acid Canyon Trail
Highlight (Segment) • Trail
Tip by
2.99 km
Ashley Pond Park
Highlight • Historical Site
Tip by
3.28 km
End point
Parking
Way Types & Surfaces
Way Types
1.65 km
1.43 km
< 100 m
< 100 m
< 100 m
Surfaces
1.38 km
1.34 km
277 m
209 m
< 100 m
< 100 m
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Elevation
Highest point (2,230 m)
Lowest point (2,170 m)
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Weather
Powered by Foreca
Friday 10 July
34°C
18°C
0 %
Additional weather tips
Max wind speed: 16.0 km/h
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This route was planned by komoot.
Frequently Asked Questions
Where can I park to access the Acid Canyon Loop?
The trail is easily accessible from downtown Los Alamos. Ample parking is available at the Aquatic Center Trailhead, which is a convenient starting point.
Is the Acid Canyon Loop dog-friendly?
Yes, leashed dogs are permitted on the trail, making it a great option for a walk with your canine companion.
What is the best time of year to hike this loop?
The trail can be enjoyed year-round, but be aware that during winter months, the presence of snow and ice can make it more challenging to traverse. Spring, summer, and fall generally offer more comfortable conditions.
Do I need a permit or pay an entrance fee for the Acid Canyon Loop?
No, there are no permits or entrance fees required to hike this trail.
How long does it typically take to hike the Acid Canyon Loop?
The loop is relatively short, usually taking around 55 minutes to complete, depending on your pace and how often you stop to enjoy the scenery.
Is the trail suitable for beginners or families?
Yes, it's rated as an easy to moderate hike and is generally suitable for most fitness levels, including families and those with varying abilities. While there is a steep incline on the return leg, it's manageable for many.
What is the terrain like on the Acid Canyon Loop?
The terrain is varied, with sections of packed dirt, asphalt, paved, and unpaved paths. Much of the loop follows a bedrock fire road through ponderosa pine stands, and you'll encounter switchbacks and small wooden bridges. Some parts can be uneven, and the second half includes a steeper climb.
What can I see along the route?
You'll experience picturesque views of the canyon and surrounding mountains. The trail itself is known as the Acid Canyon Trail. A common starting point, Ashley Pond Park, is also a historical site related to the Manhattan Project.
Does the trail connect to other paths in the area?
Yes, the Acid Canyon Loop is part of a larger network. It connects to trails like the Ranch School Trail, South Pueblo Bench Trail, Pueblo Canyon Rim, Walnut Canyon, and Bayo Canyon trails, offering options for longer hikes.
Are there any historical points of interest along the way?
The Acid Canyon Trail was originally built around 1920 by the Los Alamos Ranch School. Additionally, Ashley Pond Park, a common starting point, is part of the Manhattan Project National Historic Park.
What should I know about the steep section of the trail?
The second half of the loop includes a steeper incline, which can be a moderate workout, especially if you're not accustomed to inclines or are visiting from sea level. It's a good idea to be prepared for this section.
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