Several friends and I attempted Big Four in the middle of December via the Dry Creek route. Big Four is by far a spectacular mountain that offers a great climbing experience. The Becky guide gives a good description for the Dry Creek route. We parked at the Mount Dickerman trailhead and crossed the road and entered the forest directly across from the parking lot. There is a sporadically flagged trail leading to the log crossing over a small creek. We crossed the river and headed SW till we hit Dry Creek. Hiked up Dry creek and started climbing through the rock band by mainly pulling through steep trees which placed us at the far right side of the upper basin. Make a leftward traverse across the large avalanche basin till you get to the base of a long snow gully. Be careful at the base of the snow gully, there seemed to be a small glacier with several open crevasses. Ascend up the snow gully till you top out then traverse to the summit. There is some steep snow in the gully. We encountered sections of 45 to 50 degree snow.
If you attempt this mountain, please pay attention to avy danger. Half way up the gully we were diagonally traversing up a 45-degree slope when the whole thing shifted that made me have to change my shorts once I got back to the car. Needless to say we head down quickly. When we attempted Big Four the avy conditions were very low and we still had problems. Since then, two friends went back and attempted it again and got higher but couldn't find a way around avy prone slopes in the upper gully. They also mentioned something about a huge nasty cornice at the top of the gully. Have fun and be careful!