Cristo is a fairly wide snow gully, and is not particularly technical to ski. That said, it is steep enough to demand advanced ski abilities.
Cristo is rated D8 or D9 depending on snow conditions. For information on the D rating system, see here: http://www.wildsnow.com/articles/ratings/ski-board-d-rating-system.html
In good snow conditions, Cristo can be skied right off the summit. Depending on snowpack, there may or may not be a few rocky patches to navigate. The gully has a few rollovers, the steepest reaching 40-45 degrees. The slope has a double fall-line, and is generally a bit mellower if you stay towards the skier's right side. While not a true no-fall zone, the double fall-line nature also means that a sliding fall in the couloir could be dangerous.
Cristo Couloir is a very large avalanche path and has claimed it's share of victims. As such, this route is recommended as a spring descent in times of good stability only. Also, whether you're driving or skinning up Blue Lakes Road, be aware that several major avalanche paths threaten the road near the dam.[more]
Mountains just west of Boulder. Tons of great Alpine climbing and great ski descents. Generally there is good snow late into the spring, but doesn't really get good until mid-winter.
How to Get There
Go West out of boulder, through Nederland, and continue on. The approaches are a little longer in the spring, because of slightly lower elevations, but they average a couple of hours to the goods.
There is some camping up there, with creeks and streams to fish in, but a lot of it is private property, so be aware of where you are camping.
Nederland is going to be your best option. Go to the smokehouse and get some tasty sweet potato fries and a brew!
Be on the lookout for private property signs.