Hi Mark,
We hiked up NAP, which is clear of snow. On the way out, we walked over to the OLD Army area, still snow on the cornice. There was a nice NPS gal (she placed the new register on Langley that morning) we met along the trail; she advised strongly against OAP. Good enough for me; I'm a fair weather hiker gal so NAP much safer for me!
Gina