I have ridden Rampart three times, but I only ride it in the winter when the trails are snow covered for that very reason. When it is dry, leave it for the two wheelers.Welcome to the forum! You will have lots of great area's to ride. Bob has surely hooked you up with some good info and a link. I am in Fort Collins which is about 2.5 hours north of you. The furthest south I have gone is Rampart Range. Its basically straight west of Castle Rock. Not much of a drive for you really. Whoops from hell and head on collisions are there to greet ya! It's a fun place but you would be best to go with a local your first time to understand the dirt bike danger lurking around each bend.
I'm always on the look out for new people to ride with so maybe we can hit some trails this summer.