Altitude Series: Bighorn and Ontario Peak (14.8 mi / 4,668 ft gain)

Join us for the next hike in our Altitude Series, a structured training track designed to build the endurance, pace, and elevation tolerance needed for bigger mountain objectives such as San Jacinto, San Gorgonio, and Mt. Whitney.

This route ascends Bighorn Peak (8,441 ft) and Ontario Peak (8,696 ft) via Icehouse Canyon, two of the tallest and most prominent peaks in the Angeles National Forest. The trail climbs through Icehouse Canyon to Icehouse Saddle before following the Ontario Peak Trail along a long ridge connecting both summits. The hike covers approximately 14.8 miles round trip with 4,668 ft of cumulative elevation gain and typically takes 7–8 hours depending on pace and breaks. Expect sustained climbing and a long descent back through the canyon.

Here’s the full activity from our last Cucamonga day, including all splits and details, to give a clear sense of how the day flows:
https://www.strava.com/activities/17911124879

Who This Hike Is Suited For:

• Hikers comfortable with 10+ mile routes
• Ability to sustain a steady climbing pace on long uphill terrain
• Ability to maintain continuous forward movement for 7–8 hours
• Experience fueling and hydrating during extended efforts

Group Size & Admission Policy: Group size is intentionally limited to maintain safety, cohesion, and steady mountain pacing on long, sustained routes.

All hikers will initially be placed on the waitlist. Admission is based on pace compatibility and experience with sustained elevation routes.

First-Time Participants (Altitude Series):
If you have not previously hiked with us on a comparable route, please message the organizer with:

1. Date of your most recent 10+ mile hike
2. Distance, elevation gain, and completion time
3. Your average moving pace
4. Comparable peaks or routes completed

Submission of this information does not guarantee admission. We intend to keep the group intentionally small and will admit hikers off the waitlist as space allows, based on overall pace compatibility and training alignment.

Trailhead: Icehouse Canyon Trailhead
Parking: Icehouse Canyon Parking Lot (Adventure Pass required)

Route Map:
https://www.alltrails.com/trail/us/california/bighorn-peak-and-ontario-peak?u=i&sh=pxabuh

Essentials:
• Water (2.5-3L; electrolytes recommended)
• Snacks/fuel
• Hat, sunscreen, sunglasses
• Hiking poles (recommended, especially for the descent)
• Extra layers for summit conditions

Note on Punctuality & RSVP: Please be on time — we’ll wait up to 5 minutes past the start. If you’re running late, you can post your ETA in the event discussion, but the group may still begin without you. If your plans change, please update your RSVP — it helps us know who to expect on the trail.

Disclaimer & Safety Notice: Not So Casual Hikes are challenging outings designed for hikers in strong shape who know their limits and show up prepared. Organizers are volunteers—not guides—and cannot be responsible for your pace, navigation, or safety. We hike at a steady pace and the group may spread out. Please be prepared to navigate independently if you fall behind, though we’ll aim to check in at major junctions when possible. By signing up, you accept full responsibility for your fitness, gear, hydration, and navigation, and agree to hold harmless the Organizer, Co-Organizer, Assistant Organizers, and fellow participants for any incidents or injuries. Participation also means you agree to Meetup’s Terms of Service. Hiking carries inherent risks, including trip/fall injuries, bee stings, poison oak, ticks, snakes, coyotes, or mountain lions. Be prepared for sun exposure, heat, or marine layer conditions depending on the day.