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Deer Springs Trail to San Jacinto Peak

Riverside · Managed by Mount San Jacinto State Park (California State Parks) · Region: San Jacinto Mountains
Difficulty 68/100 · Very strenuousout and back#10ers#peak-bagging#idyllwild#pct
Distance
18.4 mi
Total gain
5,300 ft
Net gain
5,300 ft
Net loss
5,300 ft
Days
2–3
Permit
Required
Campfires
Campfires prohibited

Overview

The Deer Springs Trail is the grand route from Idyllwild to the top of the San Jacinto Mountains: 9.2 miles and 5,300 feet of climbing through forest and PCT country to the 10,834-foot summit — the most scenic of the three classic Idyllwild approaches.

Highlights

  • Suicide Rock's cliff views early in the climb
  • The PCT corridor through the summit country
  • Little Round Valley as the standard high camp
  • The 10,834-foot summit with the desert 8,000 feet below

How hard is Deer Springs Trail to San Jacinto Peak?

CaliPeaks rates this route 68/100 (Very strenuous). The score weights five factors: climbing counts for 45% — 5,300 ft puts this trip at 44% of the reference climb; distance 20% at 18.4 miles; maximum altitude 15% at 10,712 ft; route technicality 10% (established trail throughout); and trip length 10% at 3 days. A score under 20 suits first-time backpackers; 60+ means serious endurance. See how we score difficulty for the full method.

Logistics

  • Trailhead: Deer Springs Trailhead (Idyllwild) · parking: Deer Springs trailhead on Highway 243 near Idyllwild
  • Water: Seasonal springs near Little Round Valley and the PCT; treat all water and confirm flow.
  • Resupply: None; Idyllwild has full services.
  • Shuttle: Not needed for an out-and-back.
  • Stove required: yes — no fires possible on this route

Permits

  • Agency: Mount San Jacinto State Park (California State Parks)
  • Reserve or apply on parks.ca.gov
  • Quota: Primitive wilderness campgrounds — camping permit $5 per person.
  • Reservation window: Permits issued at the Idyllwild Ranger Station; wilderness sites are not reservable.

Campfires & stove regulations

Campfires prohibited. Campfires are prohibited in the state wilderness. Only portable stoves with an on/off switch are permitted. Current fire restrictions. Rules change with conditions — always confirm with the managing agency before your trip.

Best time to go

Best months: June, July, August, September, October.

Snow: The upper trail can hold snow into June.

Heat: The lower trail is warm; the summit is cool.

Bugs: Minimal.

Weather forecast

Know before you go

  • Rated Extremely Strenuous by the park — pace it over two to three days
  • Stoves only; campfires prohibited in the wilderness
  • Water is seasonal above 8,000 feet
  • Dogs are prohibited in the wilderness

Sources & citations

Data compiled 2026 from public agency and reference sources. All descriptive text on this page is original; verify current conditions with the managing agency before your trip.

  1. SRTM90 elevation data (sampled). OpenTopoData (SRTM, NASA/USGS-derived open data) via Photon geocoding (OpenStreetMap). https://www.opentopodata.org/. Accessed 2026-09-10. Elevation sampled at geocoded coordinates; location from OpenStreetMap data (ODbL).
  2. Hiking Trails — Mount San Jacinto State Park. California State Parks. https://www.parks.ca.gov/?page_id=30375. Accessed 2026-09-07. License: Public domain (US government work). Deer Springs Trail to San Jacinto Peak (18.4 mi round trip, 5,300 ft elevation gain), rated Extremely Strenuous.
  3. Mount San Jacinto State Park. California State Parks. https://www.parks.ca.gov/?page_id=636. Accessed 2026-09-07. License: Public domain (US government work). Wilderness camping permit ($5/person), campfire prohibition and stove rule, dogs prohibited.
  4. San Jacinto Peak. Wikipedia. https://en.wikipedia.org/wiki/San_Jacinto_Peak. Accessed 2026-09-07. License: CC BY-SA 4.0. Summit elevation (10,834 ft).