Depends on what you consider the best conditions and what type of terrain you are looking for.
It is great spring like conditions right now. Any mtn with a reasonable amount of east and south facing terrain will has great corn snow. (Squaw, Heavenly, Alpine Meadows and Kirkwood -Chair 4). The temps are suppose to stay warm Monday & Tuesday. Chasing the sun and corn snow is probably the best option. Rent some wide skis if you do have any. Wide skis make the corn easier particularly when to the corn is 3-4" deep.
After that things are suppose to cool down a little bit. The windows for good corn will get smaller and be a little later in the day.
If you are looking for wintry snow, Kirkwood's north facing terrain typically holds up the best IMO. The some of double diamond stuff off chair 10 tend to stay cold in the shady gullies.
MT Rose is another option to try.