Terwilliger (Cougar) Hot Springs, Oregon

What it is

Terwilliger (often called Cougar Hot Springs) is a managed hot spring site in the Willamette National Forest, reached by a short walk down Rider Creek Trail. The soaking area is a set of four pools arranged like steps in a narrow ravine, divided by rock walls. The Forest Service reports temperatures ranging roughly from 85°F (29°C) in the lower pool to about 112°F (44°C) in the upper pool.

What to expect on site

This is a popular stop with a defined day-use system and clear rules. It is explicitly clothing optional in the pool area, but visible public nudity from Forest Road 19 is prohibited. Amenities are limited but thoughtful, you will typically see a clothing rack and trash receptacles, and the site is meant for soaking rather than hanging out all day.

Why it feels different

The ravine layout creates a quiet, tucked-in feel even when it is busy. It is still a natural setting though, with loose rock, slick steps, and a history of fire impacts in the surrounding forest.

Getting there

The parking area is on Forest Service Road 19 (Aufderheide Scenic Byway). From Blue River, you reach FS Road 19 off Highway 126, then follow the byway south to the signed parking lot. The Forest Service notes that FS Road 19 is not maintained for snow and ice, so winter travel can be slow or impractical.

Trail and parking

The walk to the pools is about 0.25 miles, short but not flat, and it can be slippery in wet or icy weather. Parking is limited, and the Forest Service asks visitors not to double park and not to park along FS Road 19 because it creates hazards. Larger vehicles and trailers may need to use designated pullouts or nearby day use parking areas.

Hours, cleaning, and fees

This is day use only and is closed from sundown to sunrise. The Forest Service also lists a Thursday morning closure (8:00 a.m. to 12:00 p.m.) for cleaning. A timed-use fee applies, check the Forest Service page before you arrive because details can change.

Best for

Terwilliger works well for adults and confident teens who want a short approach hike and a choice of pool temperatures. It is one of the more structured wild-style springs in Oregon, which helps keep the site from feeling chaotic on busy days.

Not ideal for

This is usually not a great pick for families with small kids, mainly because it is clothing optional, the pools sit in a steep ravine, and there are no restrooms at the site. If you need toilets, picnic space, or a fully managed pool deck, a developed resort spring will be easier.

Mobility realities

The route includes uneven ground, steps, and slippery rock, and the pools themselves are not designed for step-free entry. Wheelchair users should assume it is not accessible. If mobility is a concern, plan for slow movement and bring grippy footwear you can safely get wet.

Forest hazards and footing

The Forest Service notes lingering hazards in the broader area after the Terwilliger Fire, including the risk of weakened trees, loose rocks, flooding, and debris flows. Move carefully on wet steps and do not assume handholds are solid. If conditions look sketchy, turn around early, the trail is short but the consequences can be big.

Heat and soak management

Temperatures vary pool to pool, and the warmest pool can feel intense. Ease in slowly, take breaks, and hydrate. Avoid soaking if you feel lightheaded. Keep soap, shampoo, and oils out of the pools.

Rules and courtesy

Alcohol is prohibited, and the site is closed from sundown to sunrise. Keep nudity out of view from FS Road 19. Do not bring pets to the hot springs area (service animals are handled under specific rules). Keep voices low, share space, and pack out what you bring in.

Is Terwilliger Hot Springs clothing optional?

Yes. The Forest Service describes it as clothing optional, but public nudity visible from Forest Road 19 is prohibited. Bring a suit if you prefer coverage and be discreet near the trail and parking.

Are there restrooms at the hot springs?

No. Plan accordingly before you turn off Highway 126, and do not treat the woods around the pools as a bathroom.

Do I need a reservation?

No reservations are offered. Access is first come, first served, with a timed-use fee. Arriving earlier in the day usually reduces the wait.

Can I camp nearby?

Camping is restricted to developed campgrounds in the Cougar Recreation Area. Do not camp at the hot springs or in the parking area.