Bright blue geothermal pools sit on a terraced, mossy hillside overlooking a rushing river in a dense, green forest.

Terwilliger (Cougar) Hot Springs: What to Know

Before You Go

Located within the lovely forest of Oregon’s Cascade Mountains, Terwilliger Hot Springs (often called Cougar Hot Springs) is one of the state’s most popular destinations. Surrounded by fragrant evergreens and fed by naturally heated mineral water, the serene setting offers a peaceful retreat in a tranquil environment. Just 1 hr 30 min from our property, visiting Cougar Hot Springs is the perfect day trip and one of the best things to do in Oregon.



Keep reading to learn more about the hot springs and what you should know before you go.

A person wearing a blue jacket rests against a log beside a steaming geothermal pool in a natural, rocky landscape.

The Hot Springs

At Terwilliger Hot Springs, the soaking experience is centered around a series of four natural, rock-lined pools that step down the hillside. Each one has its own temperature and vibe, so part of the fun is moving between them to find your favorite.


  • Top Pool (Hottest): The uppermost pool is the hottest, often reaching around 110–112°F. This is where the fresh mineral water first emerges from the source, so it’s also the cleanest and clearest. 
  • Second Pool: Just below the source, the second pool is slightly cooler (but still quite hot) and very popular. It offers a good balance between heat and comfort, making it one of the most sought-after spots. 
  • Third Pool: As the water continues to cool, the third pool offers a noticeably milder soak. It’s a great option if the upper pools feel too intense, and it’s often a bit quieter since many visitors gravitate toward the hotter pools above.
  • Fourth Pool (Coolest): The lowest pool is the coolest of the four, though still pleasantly warm. It’s ideal for cooling off after spending time in the hotter pools or for those who prefer a more gentle soak.



Overall, the pools at Terwilliger create a natural progression from hot to warm. Many visitors to these beautiful Oregon hot springs enjoy starting at the top and gradually working their way down—or alternating between pools—to get the most out of their soak.

Natural stone hot spring pools steaming in a lush, forested mountain setting with a wooden walkway nearby.

Getting There

The hot springs are located off Aufderheide Drive (Forest Road 19) in the Willamette National Forest. Parking at the springs is extremely limited, so arriving early is recommended in order to get a spot.


There is a fee station at the parking area. The cost for admission to the springs, trail, and lagoon is $12 per person, per two hours. Facilities are minimal, with vault toilets available, but there are no official changing rooms, so plan accordingly.


Getting to Terwilliger Hot Springs from the parking lot requires a short but scenic hike of about half a mile along a well-maintained trail through the forest. The walk is relatively easy, making it accessible for most visitors. Sturdy shoes are encouraged, especially in wet or muddy conditions.

Two tiered, turquoise-colored natural hot spring pools surrounded by a lush pine forest.

Know Before You Go

Below are some of the most important things to know about the hot springs before visiting. 


  • The springs are clothing-optional, which can be surprising if you’re not expecting it. 
  • There is an age requirement of 12 and up.
  • Alcohol is prohibited.
  • Glass containers are prohibited.
  • Bring your own towel and water.
  • Soap, shampoo, and other products are not allowed in the water.
  • The hot springs are for day use only and are open from sunrise to sunset. 
  • This is a protected natural area, so pack out everything you take in. 
  • Bring sandals for walking between pools, as the ground can be uneven and slippery. The pool bottoms can also contain small rocks and debris that make wearing water-friendly shoes more comfortable. 
  • Because of its popularity, the springs can get busy, particularly on weekends and during warmer months. Visiting early in the morning or later in the evening can offer a quieter experience.



Whether you’re seeking relaxation after a hike or simply looking for a unique natural getaway, Terwilliger Hot Springs offers a tranquil escape in one of Oregon’s most beautiful forest settings.

Stay at Casey’s Riverside RV Park

End your relaxing day at the hot springs by staying at Casey’s Riverside RV Park in Westfir, Oregon. Our property features RV sites with full hook-ups as well as two vacation homes, allowing you to customize your stay with us. 


As one of the best Oregon camping locations, we offer amenities such as complimentary internet access, cable television, a seasonal swimming pool, a dog park, fire pits, and clean, modern bathroom facilities. We also have an on-site laundry facility and a camp store with basic camping necessities and supplies. 


Book your reservation with us today and relax in scenic beauty!