Hi Krishna. This is going to be a tricky year for flowers, because while the general snowpack is much much lower than usual (some 30% of normal is one of the numbers I have read), there will still have to be warm enough temperatures to melt what is there (for the flowers to poke through) Normally, I have found that middle July is good for around 8-9 thousand feet, and middle/second week of August is good for the high country (based on Northern Sierra & Hikes to Dana, which is usually still covered in snow until the end of June - starting elev around 9.5 thousand ft, ends at 13 thousand). It might be earlier this year; I will be interested to read what others have to say.