I did Dana easily on June 23, last year. All snowfields then could be avoided. I had an axe which was useful on the way down, with standing glissades, but other hikers didn't have them. I'd guess it's fine without crampons. Take them along in your car, so you can leave them or take them if conditions warrant. I find the snow locally is well firmed up, and unless it's frozen in the morning, stepping up shouldn't be a problem. I wouldn't rent any considering the cost, and that you can run up nearby ***lor Peak (11,004') and/or Tioga Peak (11,513') for some exercise.