From GNP web site:
Ptarmigan Lake to Ptarmigan Tunnel/ 0.9 mi.
Projected initial clearing date: 7/12/2018 per 650
Ptarmigan Tunnel Doors: Projected opening 7/13/2018 per 650
I just came back from Many Glacier. The tunnel isn't open yet.
People have been going up to the tunnel from the MG side.
Some snow crossings left(I think).
The tunnel could open before then but depends on the trail on the north side(shadier side) to be safe hiking.
That's what I was told a couple years ago.
pete