You can expect to find moose in the half-mile stretch just north of Onahu Creek Trailhead, along the Onahu Trail. Willow areas along the Colorado River next to Timber Creek Campground and at Lulu City are other good viewing locations.
As for snow, if you visit in the winter you'll see it everywhere. Also the higher your elevation the more snow you'll see. There may also be snow storms in the spring and fall. For more information on the weather in Rocky Mountain visit, http://www.nps.gov/romo/planyourvisit/weather.htm
Enjoy your trip and be sure to stop back at OhRanger.com and post your pictures and stories!