The backside of Baldy is called the burn, a huge fire toasted warmsprings canyon in 2007 and turned the trees into tooth picks.
It hasn't been snowing there so it may be a little shredded up but... hit international and duck the rope, venture as far skiers left as you dare but if you want to make it back to the lift stick close to the ridge.
it only takes a couple runs to understand the layout of the terrain. If you can park a car out board ranch and do laps in the burn all day. The farther out warmsprings you go=better snow but be careful because you're not in the resort any more.
the trees between the gondola and old olympic might have some crud still to be had.
the terrain accessed by Frenchmen's lift is my favorite. the trees can get tight but the snow stays good. Recommend dropping in between upper graduate and cancan off lower college.
the backside of dollar might be good but i'd wager it's super sun baked.
hope you enjoy some of my favorite runs.