Diemer Trail

MODERATE 56 reviews
#6 of 28 trails in

Diemer Trail is a 3.7 mile lightly trafficked loop trail located near Yorba Linda, California that features beautiful wild flowers and is rated as moderate. The trail offers a number of activity options and is best used from March until October. Horses are also able to use this trail.

3.7 miles
452 feet

kid friendly



horseback riding

nature trips

trail running



wild flowers


no dogs

Rolling Hills easy access to great hiking in Orange County Entering the Chino Hills State park from the south Entrance at Rim crest Dr. puts you right in the middle of a great park with an abundance of wildlife and scenery. The hike starts off on the south ridge trail from Rim crest dr. Hike west along the south ridge trail as it allows you views of Orange County. At about 2miles, the road forks. follow to the right on Diemer trail. Diemer trail winds down the hill for about a quarter mile. At the bottom, head east on Telegraph Canyon back 2 miles until you see the trailhead for easy street. head south on easy street trail and back to Rim crest dr. The ridge portion offers scenic views but little shaded areas. Telegraph Canyon offers great shaded areas to stop for a snack and cool down. The easy street trail a smaller trail that is off limits to mountain biking, but still be aware as bikers tend to ignore this rule. Easy street is also a moderately steep climb just over .3 mile.

4 days ago

I began this trail at Rimcrest drive. This is a residential area where street parking is available. When I used this app for directions it did not take me to an accessible area. The app took me to Diemer road to begin the hike. Diemer road ends with a private road that is gated off and you cannot access the trail here. If you begin this trail at Rimcrest Drive the trail begins with a fork in three directions. Left is the Telegraph Road Trail, straight ahead is the Easy Street Trail and to the right is the South Ridge Trail. Be warned that to the the South Ridge Trail is a much longer Trail and without a map, could be very easy to get lost because there are many other trails that stem from it. I began by starting at Telegraph road (big steep hill to the left). The beginning of the trail offers a few pretty lookouts, we could see Catalina from the top. This trail will eventually fork in two directions. If you want to loop back to the beginning, stay to the right. The trail to the left will require you to back track. Taking the trail to the right began with a downward sloping trail. This part of the trail had some water damage, and gravel was loose, so watch your footing. The trail will eventually fork again. To stay on the loop and get back to beginning stay to the right. The trail to the left will take you back towards Carbon canyon. This portion of the loop was pretty easy, ran into many bikers here. The Easy Street Trail stems off to the right randomly, looks kind of sketchy and would be really easy to miss if you are not paying attention and don’t have a map. Easy Street is very narrow, and at the beginning winds through a bunch of trees (which is nice because it’s the rare shaded area of this hike). The trail ends up having a drop off at your left. This portion is short and will take you back to Rimcrest where you began. This was a good loop and I will definitely do it again. *trail heads are not well marked, so bring a map **there is very little shade cover, so on a hot day wear a hat and bring plenty of water ***watch out for snakes and coyotes

1 month ago

This hike is the best in the springtime (March-June). It is lush and green rolling hills everywhere and very pretty. If you go in the summer/fall it’s a stark contrast. It is brown, dry, dead, ugly and HOT since there are few trees and virtually NO shade on the trails. I do not recommend going on a hot day. Trail signs are a little hard to see so pay attention or you may end up spending a few hours hiking (unless that’s what you wanted).

1 month ago

this route ca be accessed diectly from Yorba Linda residential neighborhood onto South Ridge trail or from Carbon Canyon Rd. for a longer hike. Parking at the State Park Discovery Center is well worth the $5 fee & makes this trip about 6.5 miles. The park changes quite a bit seasonally & from year to year. Too many mountain bikers to be a peaceful hike, but most share the wide trail.

1 month ago

This is a great hike. Has more than one trail and hilly.

trail running
5 months ago

Always enjoy running this route. Disturbing when encountering people who feel the rules don't apply to them - like the obese woman in the shocking pink t-shirt walking her French bulldog off leash on Telegraph Canyon Trail between Diemer Trail and Easy Street Trail. I shouldn't have to worry about encountering an unleashed dog in an area where no dogs are allowed. Hate it when the few spoil it for the many.

6 months ago

Great hike, multiple trails.

7 months ago

Nice trail! Not a very shaded trail so better bring a hat and put on some sunscreen if your prone to burning. Watch out for people on bicycles along the trail. Nice views and fairly easy terrain. Get there early as parking along the street can get busy on the weekend.

9 months ago

Nice trail with scenery and light traffic

11 months ago

On a clear day after the rain, was able to see panoramic views all the way to Catalina. If you start the trail going left from the trailhead, it's an easy to moderate level of effort.

Saturday, November 05, 2016

Good trail...the inclines were steep and if you are out of shape they take a toll on you, but when you have completed any of the trails...you will feel like you worked out!

Friday, July 29, 2016

great scenic hike.

Saturday, February 13, 2016

Good distance hike. My 7 year old son was able to complete the trail with little trouble.

Friday, September 25, 2015

5.7 mi via EZ Street. Saw my first coven.

Monday, January 26, 2015

There is no trail to access here, it is all developed residential area.

Thursday, May 22, 2014

Did this on 5/19/14. This is a great hike. Lots to see. When entering there are three trails to choose from. All are part of a huge loop. We went left up S Ridge. We passed a trial the led to Telegraph but we continued north. This was our first time doing this trail. Unsure if the trial looped we decided to come back. Saw another hiker and was told that if we did continue north we would be able to loop into Telegraph will try this next time. We did continue back south and the small trail we did see decided to take it. Went east towards telegraph and took telegraph south to another small trial that led us back west to where we started. We are definitely going back. Saw a lot of small trails that we wanted to explore. Monday was not crowded. Arrived just before 7am and the whole time we only encountered 6 other hikers and 3 mountain bikers.

trail running
Monday, October 21, 2013

Early morning run. Beautiful views. Big coyote! Might go a little later next time and let the mountain bikers go through and make some noise first!

mountain biking
Friday, August 09, 2013

At first when my friend said we should bike up this I was pretty skeptical. I saw a lot of pictures of inclines and slopes so I imagined it would be pretty difficult, and it was at some points but once you finally make your way to the top of one of the hill trails (there's one that goes left and one that goes right), the view is amazing! I went during the Summertime so a lot of the plants were dried up, but it still was an amazing sight! On another note, there are some watermelon, squash looking plants growing on the side of one of the trails! It was pretty cool! There was also an awesome looking ranger station/recreational area towards the end of the trail when it connects to the dirt road! I also saw a pair of foxes, which was nice. Watch out for those blue bodies/orange winged wasps too! Their strings are painful, but not deadly, and they only sting when provoked so keep your distance!

Tuesday, August 07, 2012

This trail was perfect for a morning hike. Pretty well used trail. Nice views and some great flowers. Saw the most insane swarm of the biggest and brightest dragonflies I've ever seen. Few bunnies and lots of squirrels. Saw a couple snake paths but no snakes.

Saturday, April 07, 2012

This hike is one of my favorites. There are 3 different trails that you can take to start your hike off. Southridge, Easy street and San Juan. I have completed Southridge and San Juan. Of the two, San Juan is by far the most difficult as it is all uphill. It does not start leveling out till you get around the back heading back torwards Easy Street. Also, this hike is not labeled very well as far as signs to show you where you are at and what trail you are on, so make sure to have a map with you.

5 days ago

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