Lone Pine Lake is completely thawed. Saw some pan-sized trout darting around on Tuesday. There's also a hot spot on the creek at the Alabama Hills before you head up to the Portal (Just park with all the other anglers). Good luck.
I'll be doing a warm-up hike to Lone Pine Lake the day before our day hike to Whitney in mid-July -- what weight fly-rod would you take up there? I'm guessing about a 3- or 4-wt. Any favorite flies prove successful?