Difficulty PG Distance 2.1 to 5 miles Rating: 7-8 Riverside & San Bernardino Season: Fall/Early Winter Season: Late Winter/Spring

Los Santos/Trans Preserve Loop (Santa Rosa Plateau Ecological Reserve)


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San Jacinto from the Los Santos Trail
Descending the Trans Preserve Trail
Descending the Trans Preserve Trail

Los Santos/Trans Preserve Loop (Santa Rosa Plateau Ecological Reserve)

    • Location: Murrieta, in southwest Riverside County.  From I-15, take the Clinton Keith road exit.  Turn right and head southwest for 5.1 miles.  Once you are in the reserve, take a  sharp right onto Tenaja Road.  Go 0.7 miles and park at the Hidden Valley Trailhead on the left side of the road.   Admission fee is $3 per adult or $2 per child.
    • Agency: Santa Rosa Plateau Ecological Reserve
    • Distance:  4.8 miles
    • Elevation gain: 500 feet
    • Difficulty Rating: PG
    • Suggested time: 2 hours
    • Best season:  October – May
    • USGS topo map:  Wildomar
    • Recommended guidebook: Afoot and Afield: Orange County
    • Recommended gear: sun hat
    • More information: here; park map here; Everytrail report here
    • Rating: 7

This enjoyable hike samples some of the best non-Vernal Pools/Historic Adobes scenery of the Santa Rosa Plateau Ecological Reserve (although both of those landmarks can be easily added to this route.)  While it lacks the wide-ranging views provided by the hike to Monument Hill, the hike offers more variety as it passes through wide meadows, rolling hills and shaded oak woodlands.

0:00 - Hidden Valley Trailhead (click thumbnails to see the full sized versions)
0:00 – Hidden Valley Trailhead (click thumbnails to see the full sized versions)

From the parking area, head right on the Hidden Valley Trail. After 0.2 miles, turn right on the single-track Los Santos Trail which winds its way uphill, providing nice views of San Jacinto and San Gorgonio (provided the weather is clear). At 0.8 miles, you enter a grove of oaks and shortly after the trail bends sharply left and heads south (stay straight and ignore the trail branching off to the right.)

0:19 - Through the oak grove before the junction at the top of the Los Santos Trail (times are approximate)
0:19 – Through the oak grove before the junction at the top of the Los Santos Trail (times are approximate)

The trail then dips down into a ravine, crosses a footbridge and reaches another junction with the Hidden Valley Trail. Turn right and head uphill, still on the Los Santos Trail, making a short but steep ascent. After following a ridge, the trail dips in and out of another canyon before joining the Vernal Pools Trail at 2.4 miles, the approximate half way point.

0:28 - Footbridge at the bottom of the first hill on the Los Santos Trail
0:28 – Footbridge at the bottom of the first hill on the Los Santos Trail

Head left (east) on the Vernal Pools Trail for a level 0.3 miles, bringing you to a junction. If there have been recent rains, consider continuing on to see the pools, but if you are not hiking during the wet season, turn left and begin a scenic descent on the Trans-Preserve Trail ( a segment shared with the Vernal Pools/Historic Adobes loop described on this site, but in the other direction). As you make your way along the gnarled-branched oaks, you will get glimpses of the wide meadow below and perhaps San Gorgonio Mountain in the distance.

1:00 - Bench beneath an oak at the beginning of the Trans Preserve Trail
1:00 – Bench beneath an oak at the beginning of the Trans Preserve Trail

The trail drops into a wide field near a knoll known as Poppy Hill, passing an intersection with the Hidden Valley Trail, and continues north. You drop into another woodland, cross a footbridge and come out at an intersection with the Coyote Trail. Bear left and follow the Coyote Trail for half a mile to the trailhead.

1:30 - Open field before the junction between the Trans Preserve and Hidden Valley Trails
1:30 – Open field before the junction between the Trans Preserve and Hidden Valley Trails

Text and photography copyright 2013 by David W. Lockeretz, all rights reserved. Information and opinions provided are kept current to the best of the author’s ability. All readers hike at their own risk, and should be aware of the possible dangers of hiking, walking and other outdoor activities. By reading this, you agree not to hold the author or publisher of the content on this web site responsible for any injuries or inconveniences that may result from hiking on this trail. Check the informational links provided for up to date trail condition information.

1:42 - Woodlands on the Trans Preserve Trail shortly before the junction with the Coyote Trail
1:42 – Woodlands on the Trans Preserve Trail shortly before the junction with the Coyote Trail
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