In reply to Jacob Eagles:
Fatmap sum it up pretty well: "This previously very popular summit has now become considerably less so, following the devastating fire, closing the Grands Montets cable car. So now you must access this from the old mid station of the cable car, Lognan, 1975m, in summer. This is rarely done as it is a huge walk to the Col des Grands Montets, where the old cable car used to take you. More commonly this peak is climbed in the winter and spring"
So you have a 1200m slog from Lognan to the start of the route for a climb of little more than 250m
The entire popularity of the Petit Verte was the GM lift. It is attempted almost exclusively in winter and spring now on skis via the Col Rachasses from the Bochard lift.
I might suggest looking for a jollier day out.