Gregory Canyon, Ranger, E.M. Greenman, Green Mountain Saddle Rock, Amphitheater Loop

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Boulder Open Space

Gregory Canyon, Ranger, E.M. Greenman, Green Mountain Saddle Rock, Amphitheater Loop is a 5.1 mile moderately trafficked loop trail located near Boulder, Colorado that features beautiful wild flowers and is rated as difficult. The trail is primarily used for hiking, running, nature trips, and bird watching and is best used from March until October. Dogs are also able to use this trail but must be kept on leash.

Length5.1 miElevation gain2,345 ftRoute typeLoop
Dogs on leashHikingNature tripsBird watchingRunningViewsWildflowersWildlife
Waypoints (0)
Facilities
Contact
Getting There

Limited parking at the Gregory Canyon trailhead. Free to Boulder County residents, $5.00/day fee for all others.

Colorado Tourism Office, 1625 Broadway, Suite 1700 , Denver, CO, 80202, Phone: 800-COLORADO

Directions from Highway 36: Gregory Canyon Trailhead Access: Take the Baseline Road exit and travel west toward the mountains. Follow Baseline Road 1.5 miles passed the entrance for Chautaugua Park to the Gregory Canyon Trailhead. Turn left into the parking lot on a dirt road. A parking fee is charged at this trailhead for vehicles not registered in Boulder County or not displaying a Boulder Resident Permit. (Permits can be obtained at the trailhead or at the Chautaugua Park Rangers Cottage.) From the Gregory Canyon Trailhead follow the Gregory Canyon Trail to the Ranger Trail. The Ranger Trail will lead to the Greenman Trail.

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Reviews (390)
Photos (2,480)
Recordings (387)
Completed (1,636)
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Mary Popp
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Hiking

A lot of sticky snow and ice.

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Jeff Harbert
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Hiking

Glorious views and makes the steep climb worth it. Managed to get up to the top without spikes but they were very helpful on the trek back down with the snow/slush. Scenic views throughout.

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Maren Rule
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Hiking

You need to have cramps/spikes for this trail

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Juliana Todeschi
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Hiking

A little slick going up Amphitheater side and spikes and poles were extremely helpful! Going down Gregory Canyon was warm, melted, a little slushy in places. Didn’t need spikes on the way down.

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Brian Casabella
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Hiking

I intended to hike the Gregory Canyon trail and got so much more. Spikes/crampons are mandatory unless you are good at sliding.

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Wael Mansour
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Gregory canyon TH is closed (as of Friday 19th), so need to park outside. A lot of snow, tractions are needed in the steep parts

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Zack Morgan
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Hiking

It was a cool experince. I’m definatly doing it again. Weather just turned a little ugly at the top. But still really cool.

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Crystel Armenta
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Hiking

Beautiful trail but it was crowded at the beginning and at the end we encountered a bunch of a-hole runners! Don’t be inconsiderate!

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Zachary Chaffee
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Hiking

Half dozen train of runners to doge.

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Marc F
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Hiking

spikes are necessary.

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Linus Pagusara
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HikingIcy
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Stefanie Clynes
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Hiking

Great butt burner! I definitely recommend micro spikes or at the very least poles. I took my spikes on and off but per usual, super grateful I brought them.

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Alex Herbert
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Hiking

Went clockwise (up amphitheater). Easier to do the steep stuff first, especially with the ice. Didn’t need spikes on the way up, although there are plenty of spots that require great care to pass without slipping (especially near the ladder.) Not a ton of spots on the way down where spikes needed, but definitely worth bringing for those spots on the descent. As always, great views of Longs and the Indian peaks wilderness from the top.

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Stuart Williams
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Hiking
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Ryan Westerman
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Hiking
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Todd Marcacci
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Hiking
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Mena Mansour
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Hiking

With some great views!

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Harper Knight
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Hiking
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Lori Sanchez
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Hiking
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Billy Caton
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Hiking
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Nicho F
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Hiking

snowy otherwise good out

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Cate Johnson
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HikingRockyScrambleSnow
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Brissy Combs
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HikingIcy
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Amanda Kuhl
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Hiking

Covered in a blanket of snow from last night but by 830am already had tracks on all trails— lucky us not having to break trail or find the trail! This was a steep one but trail is in good condition. We used microspikes the whole time. Trail was getting real busy by early afternoon.

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Will H
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HikingIcy

VERY ICY! Hiked this loop today from the Castle Rock trailhead just up the road from Gregory Canyon since the Gregory Canyon trailhead was closed. Highly recommend spikes. Stretches of the trail are covered in ice. We did not have them and we both wiped out a few times. Nice trail, good elevation gain!

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A Chambers
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Hiking
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Shannon Brown
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Hiking
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Joah Chun
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