Agua Caliente County Park
By the HotSpringsFind editorial team · How we compile records · Reviewed September 2026
Agua Caliente County Park is a developed hot spring listed near Julian, California. Reported soak temperature: 102°F. See the visit fact sheet.
Current status
San Diego County desert camping park at the edge of Anza-Borrego near Julian with three mineral pools (outdoor 90°F all-ages pool, children's 92°F pool, glass-walled 102°F indoor spa 14+), open only Labor Day weekend through Memorial Day — closed all summer — with day-use 9:30am-5pm, $5 parking plus $7/person pool fee for non-campers.
Checked September 2026 · verified against an official source · 4 sources ↓
Before you go
- Status: Open — last verified below — confirm via San Diego County Parks — Agua Caliente County Park (official).
- Cost: Reported $5 — confirm current rates before visiting.
- Getting there: No verified hike distance on record — confirm the route and road conditions.
- Water: Reported soak temperature 102°F — always test the water before entering.
- Rules: Reported clothing required; pets reported not allowed — confirm current rules.
- Conditions: check weather, fire closures, and land-manager alerts the week you go — mountain access changes seasonally.
- Reservations/permits: No permits; camping reservable via San Diego County Parks reservation center (877) 565-3600 or online — cabins and hookup sites sell out for winter weekends.
- Best time to go: November-February weekdays; winter weekends and holiday periods are the busiest — it's the park's peak season.
- Clothing reality: Official: swimwear required in pools (county park family facility). Customary reality: everyone wears swimsuits. Not clothing optional.
- Kids: Allowed.
- Cell service: spotty — download maps and tell someone your plan.
- Accessibility: Developed county park with pools adjacent to parking; indoor spa building is enclosed — reasonable mobility access, call park (760) 765-1188 for specifics.
- SEASONAL CLOSURE — park is closed June through August (roughly Memorial Day to Labor Day weekend) every year due to desert heat; also closes for August heat alongside other desert parks
- Pool entry for non-campers is $7/person ON TOP of $5 day-use parking; campers soak free
- Indoor therapeutic spa is 14+ only; 9:30-10:30am daily is adults-only (21+); Fri-Sat 6-9pm indoor is adult campers only
- Outdoor pools close at 5pm Sun-Thu; evening Fri-Sat sessions (6-9pm) are campers-only
- No dogs anywhere — not on trails or pool decks
- No alcohol in pool areas
- Campground showers are coin-op: 50 cents per 4 minutes, quarters available at ranger station
- Remote location ~2 hrs east of San Diego via Hwy 78/S2 — fuel up in Julian or Ocotillo Wells; last miles on the historic Great Southern Overland Stage Route (County Rd S2)
- Hazard: Extreme desert heat outside the open season — the park itself closes for it
- Hazard: Winter driving can bring snow/ice on the approach over the mountains via Julian
- Hazard: Summer wildfires occasionally affect access
- Hazard: Remote — limited services nearby
About this spring
910-acre San Diego County park on the old Butterfield stage route at the edge of Anza-Borrego Desert — geothermal springs feed an outdoor pool, a children's pool and an indoor ~102°F therapeutic spa; 140 campsites plus cabins. Fee: $5 day-use parking + $7/person pool entry. Open ONLY Labor Day weekend-Memorial Day — closed in summer heat.
Agua Caliente County Park is a 910 acres (370 ha; 1.42 sq mi) park with geothermally heated springs. The park is located just west of Anza-Borrego Desert State Park, in eastern San Diego County, California. Agua Caliente is located about 110 miles (180 km) east of downtown San Diego. Spring water feed pools include an outdoor swimming pool, an outdoor wading pool for children, and an indoor 102 °F (39 °C) therapeutic spa. Site amenities include a caravan area, full and partial hookup RV sites, non-hookup sites, tent camping, and cabins. Facilities include shuffle board, horseshoes, day use picnic area, and dressing rooms. 3.95 miles (6.36 km) hiking trails from flat terrain to steep rocky trails.
Text from the Wikipedia article “Agua Caliente County Park”, available under CC BY-SA.
Directions & trailhead access
39555 Great Southern Overland Stage Route (Hwy S2), ~22 mi south of CA-78.
California geothermal context
California spans several geothermal provinces: the volcanic Cascades and Modoc Plateau in the northeast, Sierra Nevada granite seeps along the eastern front, Mojave and Colorado Desert springs in the south, and the famously mineral-rich Big Sur coast. Fire season (roughly June–November) closes access to many backcountry springs without warning — always check for current fire restrictions.
What a developed site means here
A developed site sits between primitive and resort: improved soaking infrastructure — built tubs, decks, stairs, sometimes changing rooms or vault toilets — often run by a land trust, nonprofit, or small operator. Expect modest fees or donation requests, posted etiquette rules, and more predictable conditions than a wild pool.
Best time to visit
Year-Round (Best: May – October)Pool temperatures and access can change with weather and season. Outdoor ambient temperatures fluctuate significantly across California. Late spring through autumn offers the most comfortable road access.
Fact sheet
| Reported soak temp | 102°F |
|---|---|
| Source temp (historical) | 102°F |
| Trail access | Recorded coordinates — access unverified |
| Access fee | Reported $5 — verify |
| Clothing policy | Reported clothing required |
| Pet policy | Reported no pets |
| Geothermal data reference | NOAA Thermal Springs List (1980 archive) |
| Check land status | San Diego County Parks — Agua Caliente County Park (official) |
Agua Caliente County Park FAQ
Is Agua Caliente County Park open right now?
San Diego County desert camping park at the edge of Anza-Borrego near Julian with three mineral pools (outdoor 90°F all-ages pool, children's 92°F pool, glass-walled 102°F indoor spa 14+), open only Labor Day weekend through Memorial Day — closed all summer — with day-use 9:30am-5pm, $5 parking plus $7/person pool fee for non-campers. (Status verified against an official source, last checked September 2026.)
Is Agua Caliente County Park free?
Agua Caliente County Park is listed with reported fees near Julian. Fees are reported; confirm admission, parking and permit costs with the site manager.
What temperature is Agua Caliente County Park?
Agua Caliente County Park has a reported soak temperature of 102°F and a historical source temperature of 102°F in survey records. Historical data may not reflect current conditions — always test water before entering.
Is Agua Caliente County Park clothing optional?
Agua Caliente County Park is listed as swimsuit-required in directory records. Confirm current rules before visiting, as policies change.
How do you access Agua Caliente County Park?
Agua Caliente County Park is on public land — verify current road access, fees and rules with the land manager before visiting.
Where to stay in Julian
Julian is a mountain-town stop before or after the Agua Caliente desert trip. The county park is a separate drive down to Highway S2; check seasonal opening and reserve park camping separately.
Check the road and access notes above before you book.
We may earn a commission from bookings through these links, at no extra cost to you.
Sources & references
- San Diego County Parks — Agua Caliente County Park (official) — official · 2026-09
- San Diego County Parks — Park Notices & Closures (official) — official · 2026-09
- San Diego County News Center — August park closures — news · 2024
- CATRAVELTIMES Agua Caliente guide (trip report) — community · 2026-05
Details above were verified against the named sources on their listed dates — conditions change, so recheck before traveling. · How we verify our data · Report a correction
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