Devils Postpile National Monument, near Mammoth Lakes in California’s Sierra Nevada, protects a striking wall of basalt columns formed when lava cooled and glaciers later exposed and shaped the rock. The columns rise about 60 feet and look especially distinctive from above, where their polygonal tops are visible. A short, mostly flat trail leads to the formation; longer hikes reach Rainbow Falls and other scenery in the Reds Meadow area. The high elevation can make even an easy walk feel strenuous, so pace yourself and carry water for longer routes.
How the basalt columns formed
Devils Postpile is a wall of columnar basalt in the Reds Meadow area near Mammoth Lakes. The columns formed when lava filled part of the valley, cooled and cracked. Later glacial activity removed material from one side and exposed the formation. The rock is estimated to be less than 100,000 years old.
The columns rise to about 60 feet. Their regular shapes can look almost constructed, but they are a result of volcanic and glacial processes. From the top, you can see the polygonal patterns where the cooled basalt fractured.
Walking to the formation
The Postpile is reached on foot by a short trail through the surrounding mountain landscape. One account describes the route as a roughly one-mile round trip taking about 45 minutes; another places the formation about 0.4 miles from the shuttle stop on a fairly flat path. The exact distance depends on the starting point.
You can view the columns from below and walk up to the top for a closer look at their patterned surfaces. The area’s high elevation can make walking harder than the trail length suggests. Take your time, particularly if you are not used to being at altitude.
Continuing to Rainbow Falls
Rainbow Falls is another destination in the monument, reached by a longer hike from the Postpile area. The waterfall drops 101 feet toward the San Joaquin River. Its mist can produce a rainbow, with midday noted as a good time to see one. The added walk makes this a longer outing than the visit to the columns alone.
Carry plenty of water and sun protection if you continue to the falls. The trail extends the day’s walking, so plan for the extra distance rather than treating it as a quick detour.
Getting into Reds Meadow
Access to the monument can involve a shuttle from the Mammoth Lakes or Mammoth Mountain area. Road work and seasonal arrangements have affected vehicle access, and accounts describe narrow sections of road and limited parking. The shuttle ride has been reported as taking about 30 minutes; check current access and transport details before travelling.
A ranger station near the drop-off point has information, and facilities reported there include restrooms and a water fountain. Starting early can mean a quieter walk before more people arrive later in the day.
FAQ
How long does a visit to Devils Postpile take?
The walk to the formation takes about 45 minutes as a round trip in one account. Add more time if you climb to the top or hike onward to Rainbow Falls.
How difficult is the Devils Postpile trail?
The route to the formation is described as short and mostly flat, but the high elevation can make it feel strenuous. Take your time and carry water for longer hikes.
Can you visit Rainbow Falls from Devils Postpile?
Yes. A longer hike from the Postpile area reaches Rainbow Falls, a 101-foot waterfall. Bring plenty of water and sun protection.
Do you need to take a shuttle to Devils Postpile?
Shuttle access has been recommended because roads are narrow and parking is limited. Road work and seasonal access can affect arrangements, so check current details before you go.
