Mt Whitney Zone Forums General Discussion Current Conditions Mt Whitney Trail, 2018, Old

Other posts have stated that people with microspikes have down-walked the steep slope, and have done it facing the snow. It can take two hours to get down, but it is possible. Crampons would sure be best.

If I were you, I'd plan on following the switchbacks using those spikes, both up and down. It only takes a few people to establish a walkable path on the switchbacks, even if they have snow.