No detected openings were recorded in the last 90 days. Campsite Sniper monitors Oso Group continuously and will alert you if that changes.
Of the 2 tracked site-nights (Sep 18 – Sep 19, 2026): 2 reserved.
Currently fully reserved online
Load status
Sep 18 – Sep 19, 2026Of the 2 tracked site-nights (Sep 18 – Sep 19, 2026): 2 reserved.
Open dates by month
Sep 2026 – Sep 2026No month in range currently shows online availability. 0 open site-nights across the tracked window — all tracked site-nights are reserved.
Holiday windows
Sites open per night · of 1 site| Window | Night | Sites open | Status |
|---|---|---|---|
| Labor Day | SAT Sep 5 | 0 | None open |
| SUN Sep 6 | 0 | None open | |
| MON Sep 7 | 0 | None open |
Labor Day: no online availability on any tracked night.
About Oso Group
Overview
The Oso Group Campground is nestled in the beautiful Barton Flats area of the San Bernardino Mountains. It is surrounded by picturesque pine trees and miles of scenic landscape.
In addition to a nearby lake and river access, a variety hiking, biking and horseback riding trails can be accessed from the campground. Its location also provides a great place for visitors to relax, take in the fresh mountain air, and enjoy the beautiful scenery.
Recreation
The campground provides access to the famed Santa Ana River Trail, which when completed will travel all the way from the mountains to the pacific ocean, providing spectacular views along the way. It is currently popular for hiking, biking and horseback riding.
The Rio Monte Trail is also accessed from the campground, taking hikers to the Rio Monte Panorama, which overlooks the deep gorge of the Santa Ana River Valley.
Visitors can also enjoy fishing and non-motorized boating at the nearby Jenks Lake, a small mountain lake with a picnic area and access to hiking trails.
The lake is stocked with rainbow trout, as well as largemouth bass, bluegill, sunfish and catfish. Rowboats, canoes and kayaks are permitted and fishing is also available at the nearby Santa Ana River.
Facilities
The group campground offers one large group campsite, available for tent and RV camping. It can accommodate up to 100 people and about 20 vehicles. There are no utility hookups at the site and roads, as well as the parking area, are gravel and dirt.
The site is equipped with multiple tables, a campfire circle and grills. Flush toilets and drinking water are provided at the campground. Tent pads are shaded but group areas are primarily in the open.
Natural Features
The campground is located in a dense pine forest, at an elevation of about 6,400 feet. The entrance to the Oso Group Campground is the same as for the neighboring Lobo Group Campground. Both share the region with a variety of wildlife and bird species.
Nearby Attractions
The Grayback Amphitheater on State Route 38 provides evening educational programs on most Saturdays and Sundays throughout the summer months. Programs are hosted by the San Gorgonio Wilderness Association and pertain to the area's background that is rich with history.
Getting there
Take I-10 East to Redlands. Take the University Street exit, EXIT 80. Turn left (northbound) on University Street. Turn right onto E. Lugonia Avenue/SR-38. Continue on State Highway 38 for approximately 22 miles to the campground entrance.
View on Recreation.gov ↗ Get directions ↗
Photo gallery
FAQ
How do I get a reservation at Oso Group?
Reservations for Oso Group are made through Recreation.gov. All 2 tracked site-nights are currently reserved; a free alert catches the next detected opening. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
Does Campsite Sniper book this campground for me?
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
How current is this availability data?
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Sep 18, 2026 16:19 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
Which sites at Oso Group fit a 35-foot RV?
1 of the 1 site that support RV analysis has a recorded maximum of 35 ft or more; the longest recorded is 40 ft.
Does Oso Group have online availability right now?
As of the Sep 18, 2026 snapshot, all 2 tracked site-nights are currently reserved. A free Campsite Sniper alert catches the next detected opening.
Stop refreshing. Let the app watch it.
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We run paced availability checks for Oso Group. One watch covers every matching site.
When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.