Grizzly Peak is special. The view at the top is one of the best I’ve seen of Jefferson. You are so close. I did this trail on November 12th and did not need a permit as limited entry is Memorial Day to Oct 31. There was crunchy snow at the top, but it was not slippery. Some downed trees and it feels like you are climbing for a long time. So worth it though. It is mainly a spectacular view of Jefferson. It is NOT 360 degrees to include other peaks due to trees. You can see Jack and Sisters, but the views are just okay. If Jefferson is your target, this is your trail. Road is paved most of the way to trailhead and even gravel part is good.