El Paso is completely void of MX tracks (comment based on my once a year trip to El Paso). They used to have them many moons ago. I go back each summer with dreams of finding a track.... but end up doing the dez riding stint. I'm going to EP again in July.
There is a private track west of I10. You can see some of it from the road... but you gotta look. It's just south of the Sunland exit. They wrap the jumps with chain so it's unrideable unless you know the owner. It may not be used/maintained anymore.
I highly recommend Zak Mashburn. He's based here in the DFW area and does schools all over. He caters to all abilities and specializes in the little guys. I attended a 6 hour vet class with 4 other riders and learned a ton. I'm guilty of going riding and not focusing on a section of the track. I just get out and ride. Zak will break a track down to sections and drill you through each of the sections. I got a flat half way through the class and he handed me his 08 KXF450 to finish the day with.
He can be reached at 254.592.5131 or
zak@familypowersports.com