60 Hikes within 60 miles: Denver and Boulder” by Kim Lipker
“This is a crowded “Boulder Trail,” but it’s also a true gem and an excellent workout. Green Mountain Loop is comprised of four unique trails: Gregory Canyon Trail, Ranger trail, E.M. Greenman Trail, and Saddle Back Trail
Distance: 4.5 miles
Difficulty: Difficult
Elevation Range: 5,900 to 7,800 feet
My stats:
This was a brutal hike. It is an excellent workout. It was also very technical because it was mostly jutting rock and you had to pay attention to almost every step without a lot of payout at the end.
Distance: 4.49 miles
Time: 3:05:11 hours
Elevation: 5,780 ft
Elevation Gain: 2,234 ft
Here are the pics: