We took the road from Joshua Tree to Dillon Rd via Geology Tour Rd (on our way to Desert Palm Springs).
A note, Entering Joshua Tree National Park pass was $20, paid at the park entrance (further details: https://www.nps.gov/jotr/planyourvisit/fees.htm)
The ride had lots of great scenery, would very much recommend. It was an nice mellow ride, so those new to off-roading (like us) should feel comfortable, as long as your vehicle has sufficient clearance, as one or two sections would likely be impassable without. For reference, our Jeep Rubicon was totally unfazed by the adventure, but the two of us had a great time and would absolutely ride again.
IMPORTANT: Traveled this trail many many times. If you do not have 4 wheel drive make sure someone that does knows you're going or is going with you.
HIGH clearance is required right before the end of the off road section of the trail as you enter Joshua Tree. There is a section and depending on the condition you will NOT be able to pass without clearance. The boulders can be significant enough that if you are not jacked pretty good or don't have skid plates it's damage waiting to happen.
Just thought I'd write this as some of the reviews indicate they've not finished the trail and I assure you it is as I say at the end if coming from the low desert. At least it was as of about 6 months prior to this posting.
Hope this helps.
We took this road from Indio into Joshua tree. It was about 15 miles to gte intersection of geology tour rd. Another 5-6 miles to pavement. It was fun and rewarding. I would suggest high clearance 4x4. Great vistas from the top of the pass and some neat close quarters canyons.
This is a road that's difficult to find on Dillon Rd where a gps comes in handy. Paved for the first mile or two then becomes dirt after crossing the wash. After carefully crossing the wash the pavement picks up for another 100 feet and that was it. You definitely will need to be driving an off road vehicle to continue. Note that this area at the wash are very popular to firearm owners, so don't be alarmed to see many people target shooting around there. This road has been neglected if not totally ignored by the City from maintenance so expect to see pot holes. There an abandoned mine a mile away after wash not really worth checking. Go hike somewhere else. Ironically this dirt road is very popular with Desert Jeep Tours.
Mr. G. on Berdoo Canyon Road Drive
Fun, easy road. Did not drive the whole trail. Went about half way then i decided to pull over and play with my Mossberg. Trails offers plenty of spots to do stuff like that. Can get busy on the weekends.