Brief report:
First time I hiked to Mt. Baden-Powell was starting from Islip Saddle parking lot, traversing thru Mt. Hawkings, Throop Peak, on 5/20/2000. Even in mid-May there was snow above 8000 ft.
My second hike to Mt. Baden-Powell I did it on Christmas' eve, 12/24/2000, using the Vincent Gap trail approach. I remember there were some icy sections I carefully had to traverse with my lightweight hiking boots. I did this hike late, starting at 2:00pm and so when I encountered the icy sections the trail was shaded. Stayed only a few minutes at the summit and got back to my car by 6:00pm.
Third hike up to Baden-Powell: I did this one on 12/8/2001 starting from Vincent Gap (6565 ft). Mainly it was a snow hike up to 9000 ft. At 9250 ft, it turned icy (about 1" of ice). Had to deployed my crampons for the last 150 vertical feet. Excellent views from the summit on this cool Saturday afternoon; could see Santa Catalina island, Pacific Ocean, downtown LA, San Jacinto, San Gorgonio, and even the snow-capped Sierras (perhaps, Olancha Peak).
Additional info about climbing Mt. Baden-Powell can be found here.