Keystone is probably your best bet, but there are a number of alternatives you should know about. ... First, there are two other night skiing areas in Colorado that should be mentioned. Silver Creek(Sol Vista now) is a small but very well put together night skiing area. It has a very smooth high speed Leitner quad on its main mountain that is never crowded at night. The 5(4??) runs are lighted much better than any of the runs at Keystone. It is only 1000 ft. vertical, but the good part is that it is easy to get in 10,000 vt./hr.. I never have been able to get in much vertical at Keystone. For flat out run and gun at night, I vote for Siver Creek! ... The other night ski area is Hesperus. It is about ten miles west of Durango and is small by western standards. Don't let the small put you off. I have heard it described as gnarly, and it is lit on 80% of its ski area. It is a real hoot after a day of skiing up at D.M.R.. ... Two other ski areas in the country deserve mention in the night skiing area. Park City has a real nice night skiing operation, but not nearly so extensive as Keystone(I would guess about half as much.). Given the fact that you can now purchase a lift ticket good for Deer Valley, Park City, and The Canyons, I think the choice for the Park City area has become much more competitive. The lift system at Park City is first rate and the new giant in the U.S. ski industry is The Canyons. It is worth checking out! ... The other ski area is Squaw Valley. It has a three mile long night skiing run that is serviced by its cable car. The Cable car is real nice on a cold night, but is a lot slower than an open lift. The run is a nice one, but can get boring pretty quick. I include it because of all of the wonderful terrain and ski areas in the vacinity and the fact that it is easy to get some terrific package deals through the Reno casinos. --- Hope you have a great season both night and day this year!!