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Diemer Trail is a 6.5 mile heavily 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.

Length 6.5 mi Elevation gain 679 ft Route type Loop
Kid friendly Hiking Horseback riding Nature trips Walking Bird watching Running Views Wild flowers Wildlife Bugs No dogs
Description
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Getting There

As of January 06, 2020, users have reported that there are temporary closures in this area. Please consult the park's website before visiting. 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.

Chino Hills State Park 909 780-6222

From the 91 Freeway, exit at Imperial Highway proceed north to Kellogg Drive. Exit at Kellogg and head north to the last intersection. Make a right turn on Yorba Linda blvd, followed by a left on Fairmont. Head North past the Yorba Linda education center and make a left at Rim Crest. The trail head is located at the northeast end of Rim Crest Drive just next to the last house.

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Reviews (174)
Photos (407)
Recordings (199)
Completed (396)
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Bobby Arteaga
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSeptember 7, 2020
Hiking

Loved it!!’ Start off early to beat the heat

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Pheobe Alverson
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJuly 28, 2020
Hiking

Decent trail. I like the ups and downs along the first half. I'm not a huge fan of Telegraph canyon. There's not a ton of variety in the trail, and it's usually pretty heavily trafficked.

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Roopa Bhoj
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarJuly 4, 2020
Hiking

No shade at all and it got really hot by 10AM

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Rak Din
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJune 29, 2020
Hiking

One of my favorite local trails. Unusually and unfortunately lots of trash today some likely unintentional (caps, masks) but some inexcusable (Dingtea container, party cups, food wrappers).

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Rak Din
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMay 22, 2020
Hiking

Great spring evening hike when animals are catching dinners before sunset. We saw a hawk swoop down and snatch a rat on Easy Street, a crow patiently wait and catch a large lizard on Telegraph, and a tarantula hawk wasp (large dark blue wasp with transparent orange wings) dragging a still-kicking tarantula more than 5x its weight along South Ridge. By the way, don’t mess with these wasps because their stings are among the most painful of all insects. They are also along Telegraph.

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Daniel Vasquez
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HikingNo shade
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Mike Van
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarFebruary 6, 2020
Hiking

Diemer/Lil Cyn/Coyote Trail Loop : From Rim Crest trail head east to Little Canyon. Take Little Canyon down to Telegraph Canyon Road and go west to the Coyote Trail entrance at 1.6 mile mark. Head up Coyote Trail back to South Ridge. Take South Ridge west to Diemer and head down to Telegraph Canyon Road. Take Telegraph east to Easy Street and finish back at Rim Crest. This loop trail can be done with several variations for a hike a tad over 6 miles.

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Mike Van
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarJanuary 20, 2020
Hiking

Saw a coyote again on South Ridge and got pic, but he was far away. Think he was the same one from 4 days ago, on the same hill.

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Mike Van
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarJanuary 17, 2020
Hiking

Saw another coyote on South Ridge that did not run, 20-25 yds away, until I pulled out camera. Darn!

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Kisbel De La Rosa
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarDecember 28, 2019
HikingClosedMuddy

Great and lovely hike. I would rate this hike Easy more than Moderate. Didn’t realize the park was closed due muddy/wet ground. Special note: this park is closed 48 hours after a rainstorm. ;)

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Li Ham
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HikingMuddy
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Mike Van
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarDecember 18, 2019
Hiking

Nothing unusual, except I did see a coyote on South Ridge just after Little Canyon, so that was cool. Ran before I could take a picture.

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Brian Krueger
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RunningMuddy
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Raffy Afarian
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Hiking

No dogs allowed. Didn’t know till we got there. That’s why we cut it short.

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Rebecca Chatham
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Hiking

Not really into it.

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Kassie Gutierrez
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarOctober 10, 2019
HikingOff trailOver grown

Nice hike, just missed my turn to finish the diemer loop trail, but didn’t see anywhere to change direction other than walk straight. Some parts of hike are getting overgrown. I did see a tarantula as well as a rattlesnake.

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Vishal Baheti
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarSeptember 30, 2019
Hiking

Saw 1 tarantula. Started at ridgecrest, got there around 6:45 am. Entire hike took about 2 hours and 30 minutes. If you have this app on while hiking, it’s very easy to follow the trail. Some ups and downs in the first quarter but relatively plane field after that. Would definitely recommend this hike!

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Prince Bhojwani
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarSeptember 30, 2019
Hiking

Saw a tarantula

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Mike Van
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarAugust 20, 2019
Hiking

Decent size rattlesnake and lots of tarantulas today.

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Mike Van
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarJuly 17, 2019
Hiking

Saw a deer (doe) today and a tarantula. No chance for a picture though.

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Christine Lister
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJuly 5, 2019
HikingOver grown

I started and ended this hike from Ridgecrest. Took longer than I anticipated but it was a good workout. Most of the trail is in full sun so get an early start. The junction at Diemer isn’t marked from Southridge but it’s easy to find.

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Mike Van
Yellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarGray StarGray StarJuly 4, 2019
Hiking

Lots of Blue-belly Fence Lizards today and three Alligator lizards, which I took pics of. I also saw a coyote but was not quick enough for the picture before it ducked into the bush.

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Rak Din
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HikingOver grown
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Larissa Bahr
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HikingOver grown
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Mike Van
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HikingOver grown

Four tarantulas but no snakes today.

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Tom Weber
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJune 3, 2019
Hiking

Great hike. Overcast so it was not too warm. The mustard is drying out but still lots of wild flowers to see. 3 hours all together with a snack break at the Nature Center.

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Chris Fuentes
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarMay 10, 2019
Running

Preparing for a spartan race, I thought I’d get some distance training. For the most part, the trail is open. Only a little portion of the trail is very over grown. Lightly trafficked. Rattlesnakes are out so be alert

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Rak Din
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMay 1, 2019
Hiking

It’s amazing how much the vegetation has grown since the recent rains. It’s the most that I’ve seen in over 10 years. South Ridge Trail has so much growth you cannot see the OC basin. Even Telegraph Canyon which is normally a dry and dusty dirt road with side vegetation no more than 2 feet tall, is overwhelmed with growth and plenty of shade. Butterflies, birds and bunnies everywhere. Lots of bees too but the plants are so high you can only hear them. A benefit is the mountain bikers cannot zoom by at full speed like they normally do without getting slapped by the mustard plants! If you haven’t been here in a while, now is the time to enjoy before the vegetation browns after summer.

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