Did Shasta via Avi gully on June 21st. It was full snow from Bunny Flat TH to the summit and back. We started at 4am on nice n crisp snow, summited at mid-day and were back at the car 3 hrs later. The hike/slide down from Lake Helen was very soft and slushy. Stats: 8 hrs up, 3 hrs down for 12. miles RT and 7.5k climb. Great day on the mtn. but as the others have stated above, you need to be in shape and be comfortable with crampons, ice ax and icy terrain challenges plus night navigation.
Strava link:
https://www.strava.com/activities/1047864473
Hope this helps!