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Flagstaff Mountain Summit via Gregory Canyon

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Boulder Open Space

Flagstaff Mountain Summit via Gregory Canyon is a 5.4 mile out and back trail located near Boulder, Colorado that features beautiful wild flowers and is rated as moderate. The trail is primarily used for hiking, walking, nature trips, and bird watching.

Length 5.4 mi Elevation gain 1,430 ft Route type Out & Back
Hiking Nature trips Walking Bird watching Forest Wild flowers
Description
Waypoints (0)

NOTE: Dogs are not allowed on the Boy Scouts Trail. Hikers be aware that you may not be able to complete this entire hike with a dog.

Weather
UV Index
Daylight
Reviews (107)
Photos (705)
Recordings (94)
Completed (354)
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Hope Ludvigsen
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarAugust 30, 2020
Hiking

Nice hike with nice views along the way! Would recommend walking up to the amphitheater as the turning around point.

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Jessica Fitzgerald
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarAugust 23, 2020
Hiking

Less trafficked trail compared to the rest! We hikes to the amphitheater. A little Smokey but doable!

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Lizzie Bartholomew
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HikingRocky

trail is not very well marked but easy to follow using this app. trail ended in a parking lot and not at a viewing area or something so i wasn’t a big fan of that. overall trail was okay, first mile was a lot of uphill but not too bad

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Jordan Denning
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Hiking

Found a ring near the top of flagstaff last week on Ute trail that I would like to return to the owner! Please text 970-390-1143 with a description!

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Gordie Olson
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HikingRocky
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Claire Kruljac
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Hiking

did this in early june. nice warm up trail for the season. the trail intersects with the road a couple times as well as multiple other trails so, like the other reviews say, pay attention. points off for that. my only complaint is that the trail winds around the mountain and ends in a parking lot! skip the end and take May's point instead- 1/10th of a mile to a beautiful view point of the valley and a peek of the snow capped high country.

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Tim Gaynor
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMay 23, 2020
Hiking

Hiked Saturday May 23rd, Memorial Day weekend. We arrived at the trailhead at 7:15 a.m. and had to park down the street. However most of the folks had gone on a different trail. The first 1.5 miles is quite a rocky elevation gain section. Goes along the canyon with some narrow spots. The wild flowers are out, purple, yellow and some white. The trail takes you across Flagstaff road and at that point becomes a lot less rocky and this is where you see the mtn peaks. There are some beautiful short trails off shoots that have amazing look outs. At about the 2 mile mark the trail does cross about 3 others so be careful to pay attention to where you are headed. going up maybe 6 people, coming down after 9 there were about 30 folks going up.

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Casey Reardon
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HikingRocky

Crowded.

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Olga Borysiewicz
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMarch 15, 2020
Hiking

Hiked on 3/14. Great day! Had spikes but didn’t use them. Most of the trail was fairly dry with exception of Boy Scout Trail section (snow/ice). Ended up making a loop at the end, instead of walking back on Boy Scout, walked briefly on the road and then took Flagstaff trail to Range View and back to Gregory canyon trail.

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Jared Guerrero
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Hiking

Good for dogs, couple streams. Good for trail running

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Jen Obrien
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 22, 2020
HikingIcy

Great trail. Icy and snowy still. Needed spikes.

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Tania Medel
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HikingIcyMuddy
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Kyle Helgemoe
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HikingIcy
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Jackson Fox-Bland
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HikingIcy
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Creighton Hite
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Hiking

Easy walk to summit from parking area. Amazing views of Boulder and mountain range.

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Joanna Lee
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJuly 24, 2019
Running

Not the best for trail running because the first half of the uphill is very rocky and has a lot of scrambling. However, would be a great hike. The views are absolutely beautiful at the top. Alltrails does not mention this but Boy Scout trail DOES NOT allow dogs, so basically you cannot complete this whole route with a dog.

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Amanda Schmitt
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Hiking

Hot, a lot of exposure, not enough bang for my buck.

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Colleen Roberts
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Hiking

Took me about 3 hours, and was awesome!

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Joe Perri
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HikingRocky
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Daniela Naidu
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Hiking

The first part is not well marked so I highly recommend using the trail map. You have to cross the creek twice and the first crossing is hard to find.

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T Wadsworth
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarApril 2, 2019
HikingMuddyRockyScrambleSnow

Headed into Boulder to try out the Flagstaff Mountain Summit trail via Gregory Canyon. Rated as moderate on Alltrails I would rate this more on the moderate-hard for anyone with a respiratory issue.  Although the views of Boulder and the Continental Divide are amazing even on a cloudy day, the trail I felt has much to be desired. The front half has a bit of light scrambling (if you have any kind of joint problems I advise not go this way) but once you cross the first of two small creeks the path is much less rocky and easier to navigate. There are still parts with some snow and ice and although I did have my micros with me I didn't need to use them. Also, make sure to be aware of all the trail signs as to not veer off the Gregory Canyon trail which can be easy to do.  If I were to do this again I would do the Ute and Range View Trail as an alternative to experience these views.

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Breinne M. Willingham
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Hiking

Amazing hike with breathtaking views

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Heather G.
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarMarch 5, 2019
HikingMuddySnow

I have hiked these trails before but today (just after the new snow this weekend) I was truly amazed by how new they seemed and beautiful they were! Specifically Ranger View trail was gorgeous, amazing views! Hard packed snow to an inch or two for most of the trail until you reach Boy Scout Trail. I was trail blazing for a little more than half of Boy Scout (few inches of snow) and then I was taking knee deep steps and decided to turn back the way I came. Awesome day of hiking in Boulder and I saw less than 8 people on the trail (almost never get to say that!).

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Mark Sides
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarDecember 3, 2018
Hiking

Hiked 12/2/18 - Gregory Canyon TH indicates you need to pay $5 cash to park so come with cash. Chautauqua parking is free this time of year so it's strange they require payment at Gregory Canyon.. It's possible they don't require payment but there's no sign letting you know either way. Anyway, the canyon is mostly dry but there's several small stretches that are solid ice. I just used my microspikes the whole time so I could hike fast the whole time with no worries. I used the Range View trail and hiked up to the true summit from the northwest. Came down from the summit onto the Ute trail. Nice quick hike for a morning workout. Took less than two hours RT which includes about 20 minutes exploring on the summit.

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Sam G
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarOctober 14, 2018
Hiking

The long way to get up to Flagstaff summit from the base of the canyon. Climb up gregory canyon then cross the road where there is parking just off flagstaff road if you'd rather start with a smaller amount of elevation to climb.

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