Like JBo6 says, it's totally condition dependant.
Did it last year right around the same time, maybe one week after July fourth, and, while the upper section, maybe upper third was decent(according to my partners; I bailed about halfway up), the middle and lower sections were survival skiing, at best, due to the deep suncups and runnels. . Gnarly, and very challenging. . . to say the least. .
The year before, however, skied S.S. on the fourth, and it was fantastic! Great corn, no suncups, etc, and just very fun skiing.
Kind of depends on how the spring weather treats the mountain, ie, lots of rain followed by sun, can make for very shitty conditions. Best to keep an eye on it, look for any trip reports as the time nears, etc, etc.
Good luck, and maybe see ya there!