Willett Hot Springs

Ventura County, California · Near Fillmore
34.5820°N, 119.0440°W · 4,143 ft
108°F 64°F air · Good soaking weather 4,143 ft Open Hike US Forest Service Camping nearby (7.3 mi)

Willett Hot Springs is a hot spring in the Sespe Wilderness of Los Padres National Forest, north of Ojai in Ventura County, with a man-made collection basin to hold the water. The temperature on file is 108, a proper soak. Reaching it is the work: the nearest road is nearly four miles away and the usual route is an eleven-mile hike from the Piedra Blanca trailhead. Forest Service land, open.

Location

Mutau OHV Road, the nearest road on record, is a little under four miles off; this one is filed as a hike. The spring sits at around 4,100 feet in designated wilderness, where the climate is drier than you might guess, fourteen inches of rain and a foot of snow in an average year. Middle Lion Campground is about seven miles away.

December through February are the listed months, cool enough for a long approach and a hot soak. Wilderness rules apply in the Sespe. Camp at Middle Lion or carry gear for the trail. No fee shows up on file, and the water is near the top of comfortable soaking range. This record has a photo.

History of Willett Hot Springs

Wikipedia places the spring in the Sespe Wilderness and notes the collection basin that someone built to gather the flow. The popular approach it describes is about 11 miles on foot starting at Piedra Blanca.

Terrain

Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Willett Hot Springs.

Aerial view of the ground around Willett Hot Springs LiDAR bare-earth view of the same ground around Willett Hot Springs
Aerial LiDAR bare earth

Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.

Setting
Canyon floor
Steep ground climbs away on both sides of the spring.
Highest ground nearby
819 ft above the spring
Within a quarter mile, to the northeast
Cross-section through the spring

A slice through the ground from west to east, about 0.6 miles end to end.

Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.

Heat Below
101 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 49% of the springs on this site.

Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.

Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.

Monthly Climate
45°
Jan
45°
Feb
48°
Mar
54°
Apr
59°
May
69°
Jun
74°
Jul
74°
Aug
69°
Sep
61°
Oct
51°
Nov
44°
Dec
Annual Precip: 14.2 in Annual Snow: 11.6 in
Best Time to Visit
December Air 44°F · Water 108°F · +64° contrast
January Air 45°F · Water 108°F · +63° contrast
February Air 45°F · Water 108°F · +63° contrast
December offers 30°F more contrast than August
Current Conditions
64°F
W 5.4 mph 56% Good soaking weather
Tuesday 80° Low 46° Sunny 1% precip
Spring is +28° warmer
Wednesday 80° Low 42° Sunny 2% precip
Spring is +28° warmer
Thursday 80° Low 43° Sunny
Spring is +28° warmer
Friday 84° Low 44° Sunny
Spring is +24° warmer
Saturday 86° Low 45° Sunny
Spring is +22° warmer
Where to Stay

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Nearby Camping
Middle Lion Campground 7.3 mi away

Overview Leave the city vibe behind as you meander down a winding, partially paved, narrow road that leads you into wooded Middle Lion Campground and day use area. Relax next to the running creek, take a refreshing dip, or hike the nearby trails. Tucked away in a canyon encased by chaparral and wildflower covered mountains, Middle Lion Campground is particularly beautiful in the spring and fall, but camping is great year-round.Recreation The Lion Canyon Trail (22W06) starts at the back of the...

Reservable Yes
Reserve on Recreation.gov →
Temperature
108°F
Warm Hot Boiling
Water Temp 108°F (42°C)
Avg Air Temp 58°F
Above Ambient +50°F
Good soaking conditions September
Access
Open
Road Access Hike
Nearest Road Mutau OHV Road
Distance to Road 3.9 mi
Land
Ownership Federal
Agency US Forest Service
Designation National Forest
Unit Los Padres National Forest
Manager US Forest Service
Protection 3 - Protected, subject to extractive use
Frequently Asked Questions
What is the water temperature at Willett Hot Springs?
Willett Hot Springs has a water temperature of 108°F (42°C). This is considered a hot spring, well above body temperature.
Where is Willett Hot Springs located?
Willett Hot Springs is located in Ventura County, California at 4,143 feet elevation, near Fillmore. Coordinates: 34.5820°N, 119.0440°W.
How do I get to Willett Hot Springs?
Willett Hot Springs has Hike road access, with the nearest road being Mutau OHV Road (3.9 mi from the road).
Is Willett Hot Springs free to visit?
Willett Hot Springs has Open access. It is managed by US Forest Service.
Can I camp near Willett Hot Springs?
Yes, Middle Lion Campground is located nearby (7.3 miles away).
Sources: Wikipedia