“M” Trail (Box Springs Mountain Park)

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The “M” and the ‘burbs
San Bernardino and San Gorgonio Peaks from the M Trail

Text and photography copyright 2011 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. The author does not take any responsibility for injuries sustained during hikes or walks on the routes described here. Check the informational links provided for up to date trail condition information.

“M” Trail

  • Location: Moreno Valley.  From the 60 freeway, take the Frederick St/Pigeon Pass exit.  Turn north (left if you’re coming from the west, right if from the east) and go north for 2 miles.  Turn left on Hidden Springs Drive and take a left into the park.
  • Agency: Riverside County Regional Park & Open Space District
  • Distance: 3.6 miles
  • Elevation gain: 1,300 feet
  • Difficulty Rating: PG-13 (Steepness, elevation gain, trail condition, navigation)
  • Suggested time: 2 hours
  • Best season: October – May
  • USGS topo maps: Riverside; San Bernardino South
  • Recommended Gear: hiking poles; sunblock; sun hat
  • More information: here
  • Rating: 6

The “M” towering above Moreno Valley on the slopes of Box Springs Mountain is a familiar sight to those traveling on the 60 Freeway east of Riverside. It is also a popular destination among Inland Empire hikers, offering a vigorous workout and, on clear days, some memorable views. The “M” can be reached via a 7.4-mile round trip from the west side of the park, but the more common approach is the short but vigorous “M” trail. Highlights include up-close looks at San Gorgonio and San Bernardino, and as you climb higher, San Jacinto, Old Saddleback and the San Gabriels.  There’s also some interesting geology and nice spring flowers to be seen.  Unfortunately, being as close to civilization as it is, it never really escapes the noise of the nearby roads, and there’s also a lot of graffiti.

From the lower parking lot, walk to the upper lot and pick up the trail on the opposite side of the fence.  Soon, a sign directs you left onto the “M” trail while the Hidden Springs trail goes straight. The trail ascends a few switchbacks (note that soil erosion–and people who have cut across the switchbacks–make things visually a little confusing, but keep in mind that while the trail maintains a steady grade, if it ever seems TOO steep, chances are you’re on the wrong route).

After about 400 feet of elevation gain, the trail reaches a saddle and dips a little bit before reaching a “Y” split.  (There are only a few short downhill or level stretches on the trail).  Head right, clinging to the side of the hill, and make a few more switchbacks.  Soon after, you get your first look at the M, and the antennas above it.  You also get a nice view of the Santa Ana Mountains on the left, and of the San Bernardinos on the right.  The trail climbs a ridge, makes a few more switchbacks and then meets up with the fire road.

If you want to look at the “M” from above, head left just before the fire road and walk around the antenna.  Here, you can see the “M” and enjoy a nice view of the surrounding area.


  1. Another nice hike. Thanks for posting.

    When ever I read about letters on a mountain, it reminds me of when I took my wife on the short but steep trail up “Y-Mountain” (or “Wymount”) in Provo, Utah. They’ve got a big concrete “Y” for Young, as in Brigham Young University. It’s painted white and is usually visible from anywhere in Utah Valley. Except on the early spring day we hiked up there, a light snow was falling. By the time we got to the big, white “Y,” it was pretty much invisible against the white snow on the ground. I told her she’d laugh at this years from now, but I don’t think we’ve reached that point, yet!

  2. Thanks for the great website and insightful information. I went on this trail for the first time last sat. A very good and challenging hike . The mountain top has some rewarding views of the sourounding cites and local moutian tops. Once again thanks so glad I found this site..

    1. Thanks for reading, glad you’re enjoying the site. You’re brave to be hiking the M trail in this summer heat – hope you brought extra water!

  3. Have you ever done Two Trees all the way up to the “M”?? I imagine that would be a good 6 miles each way?

  4. Yea, it’d be murder right now, doing it in October. My boys and I do Two Trees quite often. Thanks.

  5. Answering the Two Trees question: If you start at the parking lot at the end of Blaine street in Riverside Two Trees is about 3.8 round trip.

  6. Thanks for all of the tips. This trail took me about 3 hours with water breaks etc. I tracked it to be around 4.8 miles from the parking lot to touching the M sign and then back down to the parking lot. I used the address from All Trails. Really cool trail! I got great pics and some color. 🤣

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