Lane County, Oregon
Terwilliger Hot Springs
Terwilliger Hot Springs — more commonly known as Cougar Hot Springs — sits in the Willamette National Forest about an hour east of Eugene, Oregon.
- River
About this place
Terwilliger Hot Springs — more commonly known as Cougar Hot Springs — sits in the Willamette National Forest about an hour east of Eugene, Oregon. It's one of the Pacific Northwest's most popular clothing-optional hot springs, managed by the US Forest Service as a day-use area. The site features five natural soaking pools cascading down a forested hillside, each progressively cooler as water flows downward. Temperatures range from around 108°F in the uppermost pool to the mid-90s in the lower pools, making it easy to find your comfort zone. A quarter-mile trail from the parking area winds through old-growth forest before dropping into a rocky, fern-draped ravine where the pools are tucked. Moss-covered logs and dense foliage create an intimate, cathedral-like atmosphere. Clothing-optional use is the longstanding norm here and widely accepted, though you'll occasionally encounter textile visitors who aren't aware of the culture. The springs are open year-round, but winter access depends on road conditions — snow can close the access road from late fall through spring. The Forest Service charges a day-use fee at the trailhead. This is public land, not a commercial resort, so there are no amenities beyond vault toilets near the parking area. Pack out everything you bring in.
Visitor notes
Contributed by ClothingOptional.org Editorial Team
Who visits
Terwilliger draws a mix of seasoned naturists, backpackers, and college-age visitors from Eugene and the Willamette Valley. You'll see couples, solo soakers, and small groups, with a generally laid-back, respectful vibe. Weekends can get crowded, especially in summer. The steep trail and rustic setting mean it skews younger and more physically active than commercial resorts, though you'll find all ages on quieter weekdays.
How to find it
From Eugene, take Highway 126 east toward Blue River. About four miles past the town of Blue River, turn south onto Forest Road 19 (Aufderheide Scenic Byway). The trailhead parking area is roughly five miles up on the right. The quarter-mile trail is well-maintained but descends steeply in places. No reservations needed — it's first-come, first-served public land with a Forest Service day-use fee collected at the trailhead.
Things to watch out for
Road 19 is not plowed in winter and typically closes due to snow from November through April or May, depending on the season. Check Forest Service conditions before heading out. The springs themselves stay warm year-round, but access is the limiting factor. Summers and weekends see heavy use — arrive early or visit midweek for a quieter experience. No cell service in the area, so download directions ahead of time.
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Etiquette & ground rules
Clothing-optional is standard practice, but suits are allowed if you prefer. Bring a towel to sit on at the pools' edges. No glass containers, soap, or shampoo in the water. Keep voices low — sound carries in the canyon. If pools are crowded, don't linger indefinitely in prime spots. Pack out all trash. Photography etiquette: ask before shooting if people are in frame. The Forest Service occasionally patrols for fee compliance and behavioral issues.
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