I came here on a weekday after work close to 7PM, and the parking lot was full so I parked along the street. The trail goes up Gregory Canyon and reaches a viewpoint, and then it goes pretty much alongside Flagstaff Road on the way down. The first half climbing up was quite nice and nature-y, and the view was quite pleasant with rolling mountains in the distance. Coming back down on the path but basically cutting through the road wasnt as pleasant because although I was personally in nature, the sounds of the street ruined that experience a bit. Nonetheless, it was a good hike, took me about 1.5 hours to complete the loop.

We did the 3.6 mile loop on 11 June. There are definitely areas that are rocky, so wear proper shoes. Plenty of shade along the route. You do cross a road 4-5 times on the way down (if you go clockwise) so just be careful of cars flying down the road. Overall, great hike!

Although the lot parking is limited, you are able to park on one side of the road. Be aware that there is a $5 daily fee to park. Registering your car online at Boulder OSMP for an annual pass for $25 is a great deal.

Absolutely beautiful and breathtaking views. Showed up a little late so we couldnt complete any trails as it got dark quickly but none the less we still managed to push on even in the dark pitch black night.. Its a different vibe hiking at night!!! Ill be back on time so we can knock out all the trails

Nice after work activity. We came from Denver and it wasnt too bad. Really wonderful views with a lot of hiking opportunities.

Easy access to the Flatiron trails! You will need to pay $5 cash for a days parking permit, or $25 online for an annual permit, if theres parking available. TIP: Get there by 7am to find parking!

Excellent rock climbing. Great trails. Beautiful views.

The many different levels of trails is awesome. Having MS makes hiking difficult most days, but even 5 minutes into a walk produces the most beautiful views. Definitely my new go to place.

Beautiful hike. The only difficult part is all the rocks at the beginning of the trail. You have to watch where youre walking for a good portion of it so you dont hurt your ankle. That was frustrating because I want to look at the view not the ground. Once you get past the rocky part the trail opens up to a dirt road and becomes very peaceful and beautiful, definitely recommend.

Good trail! A lot of steps. If youve ever done Mt Sanitas, it is very similar. Escalates quickly. More of an incline. Technically moderate but can feel hard for newer hikers.

A few parking spots at the end and several along the road there. Theres a portable toilet at the trailhead also.

A little more intense of a hike than we were anticipating. Really cool place though. :-)

Lovely green trail bracketed by towering rocks. Be warned though, it is unrelentingly steep all the way up.

Headed into Boulder to try out the Flagstaff Mountain Summit trail via Gregory Canyon. A 5.4 mile out and back with a starting elevation of 5797 and gain of 1430 and an average grade of about 15% with several areas hitting as much as 45%. Rated as moderate on the Alltrails app 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 didnt 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 experience these views again I would do the Ute and Range View Trail as an alternative.

Rocks-hopper friendly. Be prepared to put some energies if you go out of the standard trail and decide to take the shortcuts to the amphitheatre and beyond. Trails are well signaled and maintained. Hiking equipment is recommended.

Plenty of wildlife. Can get your heart pounding in some spots.

Very pretty and a fun hike for 8 and 10 year old, but vry busy.

Best spot in Boulder to hike great views throughout the whole trail go the extra mile and head up the green mountain get an amazing view that make the hike well worth it.

It has nice view and good breathing place I like the place

Nice park for family activities from picket Ball to bbq

Great awesome hike right outside of Boulder,connects to other trail heads making it longer if you want ,I would rate it as moderate as in the beginning it has some steep incline. We took our 10 month old puppy and she loved it !

Beautiful trail, and very cool at the base! But nobody wears masks, it’s quite popular, and there’s limited room to step off the trail!

Definitely an amazing place with an amazing view

Well traveled with different levels of difficulty. Beautiful views. Relaxing with low stress.

Amazing day rock climbing! Love the trail, though its super busy and parking is a nightmare!

Great local area for trails

I do a lovely but challenging little 3 mile-ish trail run from here. Start on the Amphitheater trail, then take the Saddle Rock trail uphill (and up and up!) to the split with EM Greenman. Take Greenman until it meets the Ranger Trail and turn downhill to the right to take Ranger. After you pass the picnic shelter youll meet up with Gregory Canyon trail. Take that down to the trailhead. Voila! There are some spectacular sunrise views if you go early.

Many trails for different skill levels... fabulous views!

Great place to walk I love it

Love this trail! Great for a quick hike or run. Easy and fun so great for kids as well

Nice, moderately strenuous hike with nice views

Great place to go have some awesome views

A little icy but beautiful views.

I usually load around 50-75lbs in my pack and hit this on the reg!! Its beautiful!! Def take your time and enjoy the views!!! The first picture is PAST Realization Point btw!!!

Amazing trail for hikers

Loved the trek through the nature

Fun hike that you can easily make into a long loop that skirts up and around Flagstaff road. Rather strenuous hike in some areas but worth the lookout over realization point at the top.

Anqxing hike with great magestic rocks!

Hazy from California fires

Some very steep trails - look at the map. Also parking is $5 and you need cash!!Very packed on the weekend.

Blend with the nature, enjoy the wind

Spectacular views, and really fun hikes, I highly recommend checking this place out. Friendly heads up though for fellow out-of-towners, if youre not use to the altitude, you will get winded and dehydrated quickly.Make sure you bring plenty of water, and decent shoes if you climb some of the steeper trails. But if nature hikes are your thing, you wont be disappointed.

Best spot to start the flatirons

Geourgeous views!

Some real mad formations of rock, made me think wow how did these get here ? Then you remember take every breath like its your last and altitude sickness is no joke.

INCREDIBLE...

Awesome. Would be better if the parking lot was open

Beautiful spot! You will need hiking shoes. There is a loop trail that brings you back to the parking lot. Its quite a climb, but so pretty.

The start of Gregory trail is 15 paces to the right of the formal trailhead. If you go across a nice bridge, you have gone too far already. Parallel parking needs to be measured and striped.

Beautiful!

Careful where you park theres random no parking signs I didnt even notice and got a ticket but very nice trails great views as well

Great hike

Good walk for me and the dogs!!!!

Great trail, head up to Flagstaff then back down the stairs. Great views.

Good parking in the lot and along the road. There is a fee.

I fancy myself a pretty decent hiker, really leaning into that Boulder-er than thou mentality on the trail when I seemingly zip past lowlanders out for a stroll, but... this trail kicked my butt! The backside, once you get to the mostly-level section, is a lot of fun to cruise through and enjoy what feels like some deep woods action. My wife and I went on an early Fall day and there werent a whole lot of people out which, when coupled with a short section involving a ladder - that apparently struck a chord with my inner child, who thoroughly enjoyed the mere idea of a ladder on a hiking trail - made for a wonderful hike. We went counterclockwise, so the Amphitheater trail was our descent (highly recommend doing the trail in this direction). However, I was jokingly referring to that last part as The Quad Quiver-er, cause man... my legs were shakin pretty good. At any rate, smile, pretend youre not breathing heavily, and lord your hiking superiority over the tourists, like a proper Boulderite.

Magical and much less traveled than chautauqua. Beautiful sites. Though parking is kind of annoying.

Amazing views. Some of the trails arent very defined.

Had an awesome time hiking. Highly recommend this place

Amazing views!!

Lots of wildlife. Keep a good look out

If you love to hike or ride or 4x4 or ect... lol its the rockies, you cant go wrong

Gregory Gregory....This is, essentially, a death sentence, if youre unprepared without quality shoes, and adequate water.The payoffs and scenery are lovely throughout this hike though!! You get a lovely overlook of Boulder at many different sections, then another section will be straight up mountains!It was strenuous but rewarding!

Its a way to get to Green Mountain--my favorite Boulder hike.

Lovely, shaded, fairly hard hike up the saddle. Enjoyment marred by two cars getting broken into while the owners were hiking. We were fine but a young Canadian couple surely was given a lasting, negative impression....

Think of anything. Live life in your head? Go for a great hike email the office and breathe in the breathtaking views. The trail to devils thumb Rock is so soothing to the soul. All at the rangers station about why Chiquita is such a grreeaaattttt gathering place for everyone including the Texas teachers association. Many happy returns for soothing my head trauma.

Flatirons are worth the hike!

Nice place for hiking

To avoid Chautauqua crowds, this trail head makes a great substitute with plenty of options and best boulder views. About 2 hour climb to the top for a group with smaller kiddos.

It has good access to trails, but the parking is very limited.

A small lot that fills up quick, but there is parking on the road as well. The hike itself up Flagstaff is a couple hours out and back, but not very difficult. There were a decent amount of people as well. The route is fairly obvious, but it is not marked with cairns or blazes.

This place is though. Let me say congrats to those faithful to the trails and climbing.

Get there on a week day to avoid 10k people and their dogs

One of my favorite places to take my dog, visitors, or friends!

Bring cash ($5) if you plan on parking in the lot area anywhere past the sign that says pay fee lot (I saw someone get a ticket that was parked on the side after that sign..the hike is worth every penny of the $5!! I took Gregory to Ranger all the way up to West to the summit...then back down by E.M to Saddle Rock to the parking lot, was 5 Miles & approx 2400 elevation gain...again, worth every step!! Had to use spikes on a decent portion of it, especially down E.M. & Saddle, this was a tough, steep rocky hike, with beautiful views..I loved everything about it!!

Great hike up to Realization Point. Great views and some challenging inclines. I wore my two-year old and she climbed a good portion of it as well. Fantastic hike for the family that gives you a true Rocky mountain feel.

Lovely

End of July status update: restrooms still under repair. Porter potties were a bit grim, but at least there. Trail open and in pretty fair shape having been diverted round trail damage.

Great place for a hike.

Nice hike too much city noise. Go right on Gregory for the easier hike left for a tough climb.

This is the best hike we have found in Colorado so far. Although it was a bit treacherous, it was nothing that we couldnt handle. Absolutely beautiful!

Relaxing and calm great nature walk

Love love love this trail. Gorgeous

Great viee of the city, lots of other hikers to share it with.

Great views!

This is one of my favorite trail heads in the Boulder area; its a great starting point for any hikes you want to take up Green Mountain. This is a very popular spot, so if you want parking, plan on getting there early. The trailhead includes restrooms and trash cans, but no water.

Absolutely wonderful for rookies. Two hours up to Saddle. One and a half down. 1500 elevation maybe. 150 floors per Fitbit. About 6 miles all told. Trail is generally rocky but safe. Started getting altitude effects at top. View back to Boulder is great. And the other way you see snow in the central range. Couple of beautiful babbling brooks. Met many other hikers abd joggers who were all very courteous and friendly. Wonderful experience.

Really beautiful place. One of the best hiking spots in Boulder

Terrific view and easy hike

Did 2 awesome hikes starting from here. Royal Archa and Green Mountain. Parking is only $5.

Great little hike

Wish there were better/more detailed maps on the trail. Glad we were in a group with a hiker who knows the trail because i would have worried about getting lost. Great hike though!

Beautiful views and challenging trail!

Fantastic trail hike. Steady incline. Partial shade. Beautiful view back down toward Boulder. Def fits into doing Flat Iron trip as well.

Access point to many trails of varying difficulty levels on the slopes of the Flatirons.

Whew! Its a nice hike, works your legs! Its not too scenic, and really gets your blood pumping when you walk!

Chautauqua Park is wonderful. Its so nice to walk out of the town and into the mountains on some beautiful hiking trails.

Limited parking and costs $5 without Boulder plates.

Wonderful trail

Excellent hike. Not hard at all. Lots to see.