by orion » Mon Jun 14, 2010 5:09 pm
...a few weeks from your trip, at least, probably more.
Those lakes are in a sort of bowl on the north side of the mountain, so they melt slower, and that shady draw leading up to Grant Lakes turn-off starts at 9000', so I'm guessing a snowline above 9500' would be a good idea. That may sound like a ridiculously high snowline to wait for, and then you see it and it makes sense. Right now the snowline is pegged around 7000'.
You could go earlier, but those lakes kinda lose their point with all the snow. You'll be getting your drinking water from streams anyway, and won't want to approach the half-melted shoreline with ice overhangs and hidden ponds you could posthole into. I camped on the exposed ridge to the east of the lakes, with snowfields running down both sides. It would have been pretty miserable if the weather turned. When I came down the draw there were dozens of footprints of those who had turned back.
Maybe try Jack Main Canyon instead, starting from Hetch Hetchy. Wherever the snowline will be, there is something cool to see from Lake Vernon on.