Historyperson: be careful of the definition of "open". It's true that many of the roads can get you close or even to trailheads in mid-June, but there's still a huge amount of snow. For the northern Sierra, this is now an all-time record year for water content -- meaning a very dense and slow melting snowpack. The semi-good news is below about 7,000 feet, it's below average so that'll melt out early (and is even gone in some places). Above that, though, it'll be mid-July before travel is reasonable. Streams will probably stay very high until late July.
Which reminds me, in addition to snow depth, stream crossings are an even more critical consideration. So plan your routes with those in mind. If there's not a bridge, it may be unsafe into at least mid-July, maybe longer.
And, as I write, this just in:
https://www.nps.gov/yose/blogs/update-f ... 6-2017.htm 91" at Tuolumne!! (8,600'). That's not going away in the near or far future.
