Originally Posted by abmj-jr

As for the breathing challenged, the elevation on the Valley floor is approximately 4,000 +/- feet. The drive into the Valley will climb a little higher but shouldn't be too onerous. Be aware, however, that other areas of the Park are considerably higher and more challenging. Glacier Point, Tuolumne Meadows, White Wolf and the Tioga Pass Road are probably not a good idea for someone who uses a concentrator.