California’s hottest hot spring comes out of the ground at 194 degrees, and reaching it takes a two-day hike
The water at Sespe Hot Springs comes out of the ground at 194 degrees — hot enough to scald skin on contact — and there’s no trailhead shortcut to reach it. This is California’s hottest hot spring, and getting there means committing to real mileage, not a quick soak-and-go.
It sits in the Sespe Wilderness, a stretch of Los Padres National Forest about 21 miles north of Ojai. By the time that boiling source water mixes with the creek downstream, the soaking pools settle into a far friendlier 105 degrees or so — test the water before you get anywhere near the source itself.
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The route (and the shorter alternative)
Most people start at the Piedra Blanca Trailhead and follow the Sespe River Trail up the canyon. Willett Hot Springs shows up first — just under 20 miles round trip with about 2,486 feet of climbing — and plenty of backpackers call that close enough and turn around there.
Sespe Hot Springs itself means pushing further: the full round trip from Piedra Blanca runs 30.4 miles with roughly 3,622 feet of elevation gain, typically spread across two or three days. There’s a steeper shortcut too — Johnston Ridge Trail out of Mutau Flat covers just 17.2 miles round trip but crams in 3,638 feet of climbing, and honestly, steady extra mileage beats that kind of grade every time.
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Permits, fees, and the condor sanctuary next door
Piedra Blanca is the only fee trailhead in Los Padres National Forest, so parking there means a $5 Adventure Pass — or an America the Beautiful pass, which covers it too. Backcountry camping itself is free with no wilderness permit required, though you’ll need a free campfire permit for a stove or fire, easy to grab online or from any forest officer before you go.
Keep an eye out for California condors circling overhead — the Sespe Condor Sanctuary next door has been off-limits to the public since 1947, when the Forest Service set the land aside to give the nearly extinct birds a safe place to breed. Stay on the trail; unauthorized entry into the sanctuary carries fines up to $5,000 and possible jail time, and that closure is actively enforced through at least October 2027.
When to actually go
Skip this one in summer. Sespe Creek runs low by midsummer, heat in this part of the Transverse Ranges climbs well past comfortable for a multi-day carry, and wildfire risk peaks in these mountains right about now.
Spring and fall are the real windows for this hike, so if you’re already thinking about it, let this be your nudge to start planning a fall trip instead. Cooler air, better water levels, and a lot fewer people fighting you for a spot by the pools — worth the wait.
Trip tips: grab a rental car to reach the Ojai-area trailheads, lock in a hotel in town before you set out, or roll in with a camper van and just sleep at the trailhead instead.
Rules and fees change — always confirm current requirements before you go.
