Hello High Sierra Topix,
I'm posting here at the suggestion of maverick (and thank you for the nudge). I found this board by googling "sierra mosquito report" while preparing for a recent trip, and lo here you are, and here am I.
I grew up vacationing in the Sierra, and have lived in the central Sierra off and on for the last 15 years. I am lucky to have recently returned full-time to the Yosemite area. My Significant Other and I got distracted from backpacking in recent years (okay, I'll spill: Golf is sooooo much more fun than I can conscientiously justify), but now that I'm living near Yosemite again (and have a new job that allows for vacation), we are planning to double down for the 2015 season.
My S.O. and I are both finicky about mosquitoes -- we routinely carry Bug Shirts, and we always carry nasty DEET, and we have found the added weight and chemical ickiness to be well worth it for trips that we would otherwise have terminated early -- so I sincerely appreciated finding the HST's Mosquito Report. Hopefully I can share some trail beta and some love in return.