Got to the trailhead at Logan Pass around 630am and it was filling up decently quick. I did this trail in late September and it definitely gets cold the higher you hike. This can be a pretty strenuous hike so bring plenty of water and be prepared. Definitely recommend this hike. If you're feeling up for it then head up the Garden Wall Trail turnoff to check out the Grinnell Glacier Overlook! Highline Trail is also a very popular trail so there'll be people around.