Forums Splitboard Talk Forum Splitboarding Mt. Rainier Reply To: Splitboarding Mt. Rainier April 28, 2006 at 1:51 am #588476 Jon Dahl 384 Posts I can vouch for sun cups of tremendous size in the late season. A few years back I did Adams in late July and found the sun cup from hell on my way down, exited it upside down, and did my only ice axe self arrest boarding. I’d watch conditions and plan on moving my trip up a few weeks myself if possible, especially if you are dead set on the split. Otherwise you may be better served with a solid board (lighter) on your back. And be aware of the weather here, unlike other fourteeners Rainier can become quite nasty. Well know fact is that the weather on her can be the closest you can get to the Himalaya’s w/o actually leaving the continent!