I found this trip report on Rae Lakes last year, someone was able to pass Glen Pass
without any problems, that's encouraging for this year in late May as well.. although
you never know til you get up there.
Yes they were able, but you have to take into consideration whether the person who
wrote that was experienced or not. It is easier for someone who has gone over the pass
before to do the trail with some snow on it, if they pick the right time of the day so
the snow is not hard/icy or to soft (postholing). If tracks from previous backpackers are
present then it will be easier, just be very cautious.