Question for the group on how to do a successful summit next summer.

My son (15) and I tried to Summit this summer (June) in a day hike; we made it up the switch backs to Trail Crest (well within 200 feet) when he started feeling so bad that eventually I decided to turn around. We've been at 13,000+ before without problem and he's normally the way stronger hiker on like a regular 15 mi hike. He walked down fine albeit very slowly (exhausted). Bummer.

We want to try again next year and I want to avoid a repeat but I'm not sure what caused it. No headache, no throwing up. Now he did have an episode 48 hours before we took off with throwing up several times (not at any elevation).

Any suggestions on what to do different next time? I really, really would hate to turn around at 75% done again. I just have to get to the summit! smile