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 18 tracked site-nights (Apr 16 – May 3, 2027): 16 open for online reservation · 2 reserved.
Where the open windows are
Load status
Apr 16 – May 3, 2027Of the open site-nights on mapped sites, 9 fall on weekdays and 7 on weekends (Fri–Sun).
Open dates by month
Apr 2027 – May 2027April holds the most room. 13 of 15 site-nights are still open there.
Holiday windows
Sites open per night · of 1 site| Window | Night | Sites open | Status |
|---|---|---|---|
| Memorial Day | FRI May 28 | 0 | None open |
| SAT May 29 | 0 | None open | |
| SUN May 30 | 0 | None open | |
| MON May 31 | 0 | None open |
Memorial Day: no online availability on any tracked night.
Availability
Most open site-nights · tracked window| Site | Open site-nights |
|---|---|
| 1 | 16 |
This site currently has 16 site-nights available.
Tracked window
CoverageCampsite Sniper's data for this facility starts Apr 16, 2027. That is about 165 days after the current snapshot was taken, so dates before Apr 16, 2027 are not covered by what Campsite Sniper tracks here — they are not known to be unavailable. The site-nights shown on this page describe Apr 16, 2027 onwards only. Check Recreation.gov for earlier dates.
Stays and site detail
Multi-night stays. 2 2-night, 2 3-night, 2 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Apr 16, 2027 at site 1.
RV length. Longest recorded site here is 40 ft. 1 site takes 25 ft, 1 site takes 35 ft, 1 site takes 40 ft.
All 1 site with current availability
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| 1 | 40 ft | None | 16 | 9 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027 +4 more |
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. The current snapshot shows substantial availability: 16 of 18 tracked site-nights are open (88.9%), though availability can change. 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 Nov 2, 2026 16:20 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.
Can I get a multi-night stay at Oso Group?
2 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Apr 16, 2027 at site 1. Confirm and book on Recreation.gov.
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.
Which month has the most availability at Oso Group?
April 2027, with 13 open site-nights in the current snapshot of 15.
When is the next open date at Oso Group?
Campsite Sniper cannot answer that from the current snapshot. The availability data held for Oso Group begins Apr 16, 2027 — about 165 days after this snapshot was taken, so any earlier dates are outside what Campsite Sniper is tracking here rather than known to be unavailable. Check Recreation.gov for dates before Apr 16, 2027.
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When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.