The schools in Lake Arrowhead are a source of pride among the locals. Many have received awards for academic excellence. Although we enjoy rather mild winters, the probability of snow is greatest between November and March. Snow has been known to fall as late as Mother's Day. It can rain or snow when you least expect it.
Preparation is the key .
A pack, like the type used for earthquake preparedness, is good to have in your vehicle at all times. The CHP sometimes will require that even 4X4's put on chains. Minimally, they will require you have chains in your vehicle and may want to see them. Also, make sure you know how to put on your chains without assistance, how to operate the four-wheel drive system you own, and that the system is operating properly before coming up. Last, Southern Californians rarely have any experience driving on snow or ice.