You can get to Hidden Valley all winter I believe. I haven't gone to it but have ridden in the Terrain Park and Flat Top in the park. RMNP is kind of amazing. Several friends hit that up every now and then mid winter.
Jones Pass. Blah. It's alright. Jones/Butler Gulch are early season spots. Once the snow has piled up you are better going to that other well known lost ski area. Berthoud Pass. People can knock it, but more bang for your buck there than anywhere else in the Front Range. World class too.
Geneva Basin, meh. I've been there twice and I don't think I'll ever go again. The big plus is the hut. That is pretty nice. You could definitely have a good time staying there, bring wood to burn. The terrain is pretty low angle although I did not get over to the Duck Creek area because of the very real avalanche danger in that zone. Fairly easy skin to the top. The other problem is that area has a lot of sun exposure. So the snow gets manky fairly quick. There is a reason it closed down, and that is probably the primary reason. Crappy snow conditions when other areas are just fine. You can probably drive in fairly close using the Grant side of the Guanella Pass depending on the time of year and how much snow has recently fallen.
Porcupine Gulch, no real experience with that one at all. I've heard of it.
Last edited by killclimbz; 10-03-2013 at 06:12 PM.