The Arête des Cosmiques is a great introduction to alpine mixed climbing, given AD grade with 200m of height gain.
This route can be climbed year round: autumn, winter and spring. It is snow covered, so crampons are generally worn throughout the climb. In mid summer the ridge can be nearly snow free, with only the odd snow patch & generally good dry foot holds and maybe some ice in the final exit chimney.
Subject to favorable weather.