It has a very low slope angle of about 5%, so it would be really more like a hike, esp in such low gravity.
Unlike Mt Everest, a mountain formed by a collision of tectonic plates, Olympic is a shield volcano and they are the opposite to mountains in terms of slope angles.
- low gravity: -1 difficulty
- less traction because low gravity: +1 difficulty
- supply chain from earth: +1 difficulty
- full spacesuit in addition to supplies: +1 difficulty
So overall my pseudo math: +2 difficulty