Explore Want to do - view hand-curated trail maps and driving directions as well as detailed reviews and photos from hikers, campers and nature lovers like you.

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hiking
8 hours ago

Just did this trail today. It was my sister and my 2 children ages 11 and 8 and they loved it! We did Ape Trail that was above ground and once we got done we walked back and then went underground. I’m not sure which one we did I’m seeing a lot of posts where people say they did the Upper Cave area but crawled and we didn’t crawl at all. It was an open area cave but pitch black. I used a head flash light and my cell light and my kids had their own lights as well. We didn’t finish the cave trail due to my son sprang his ankle . The terrain is very unsteady so watch your step. Other than that it was really fun and awesome. I’m definitely coming back but more in the spring or summer time. Happy Hiking!

Trail is impassible without snow shoes and ice picks even in June. If you plan to hike this trail wait until late July August (I found this out the hard way)

Ice last on north side out of sun
Still quite doable

Did the upper caves (the challenging ones) and absolutely adored it. It gets a bit challenging in some parts but I wouldn’t consider it very hard. I enjoyed all the way.
I would recommend wearing a nice coat since the temperature is Lower downt there and definitely two sources of light (head lamp and flashlight will do) some light gloves might be helpful as well and I wouldn’t take kids younger than 8 or 9 (not only for the physical part but the fact that it’s completely dark and might find it scary)

By the way, you will need a permit in dashboard of the car to park in the lot.

hiking
5 days ago

We did this trail after going to alum cave first. I would not suggest that you do both in one day unless you are conditioned. Chimney is strenuous. Trail started to get crowded. Go early!It’s a nice trail but it is a thigh killer. Would def go back especially to finish the trail where it is closed at the top.

hiking
5 days ago

Hiked 11/10. Trails are well packed, definitely need spikes the whole way up. Poles are helpful at chasm crossing. Trail is hard to find above treeline, but is still well packed. Look for the giant cairns.

hiking
6 days ago

Did both caves. Did this hike without hiking baby. And I would never do this with hiking baby. Helmet is a good idea for upper trail. Recommend 2 sources of light. 1 for use 1 for backup. You do not want to be in the upper cave without light. Rope is installed for 8ft climb. Was completely alone on upper cave. Honestly not smart to do upper cave alone. Learned my lesson on that one. I am a big guy and there is a lot of tight spaces. But I did it with a camera bag and backpack. Was alone for most of the lower cave.

A 360 view at the top! First hour is tiring then it actually gets more gradual as you get closer. Today, in November, it had snow about half way up or the last third. it's all packed down though. you don't need spikes but polls are helpful.

Waterfall is currently iced up and slow flowing. Not one of the most exciting destinations to visit amongst the Rocky Mountain trails. Would recommend traversing past and head over to Mills Lake.

backpacking
6 days ago

I got engaged on Mount Si! Great day to go for a hike. Very clear and the trail was well maintained. There is a small spot where a tree has fallen over the trail and people have made a trail through it, but coming back down it’s hard to tell where it is. All over perfect day.

hiking
6 days ago

This trail cranked me.

Not very scenic from the trailhead until 2 miles in. The top of the tree line was covered in snow and it was very windy. By then we were just trucking through knee deep snow. Would do again in summertime.

Beautiful trail which suffered from the 2016 fires. They have made some great progress in restoring the trail and even though the end of the trail is still closed to hikers, it's well worth the 1.75 mile hike to the new overlook

Beautiful even in snow-packed conditions. The falls are mostly frozen over right now, but there’s lots of easy trails in the area. Good grips on shoes (or traction clamps for shoes) would have made it easier, but still fun! And dress warm!!!

10 days ago

hiking
10 days ago

Only thing keeping it from getting 5 stars is the last section being closed since the 2016 fires, I understand why it's still closed but can't say it isn't disappointing. They have put in some great work to get the trail to the point it's at, but ending where it did was a bit of a tease. As is still a nice short hike with a good climb for the last third.

hiking
11 days ago

Great hike! It took us about 3 hours up and down, with lots of stops for pictures and a little rest at the top. Inclines are steep and it was pretty slippery, but overall fine. Views at the top are gorgeous and well worth the climb.

hiking
11 days ago

This was awesome!! It took my girlfriend and me a little over two hours to complete and there were definitely some steep inclines and declines! Not for the faint of heart, but the views at the end are worth every second!! 10/10!

I hiked this trail in 1972 and it was an amazing journey. A fellow wanderer and I took off one morning from Glacier Basin Campground and parked at Bear Lake. Hiked up and over the mountain and camped in a primitive campground. Got scared like I've never been scared in my life from some animal noises outside the tent. I lost the coin toss and had to see what it was. Never been so happy to see a porcupine in my life! The next day we hiked on down to Grand Lake and caught a ride with some hippies in a VW bus who took us back across Trail Ridge Road to our car. As I recall the total hike was about 16 miles and it was through some of the most beautiful country I've ever seen. I would love to think I could do it again some day, but I'm pushing 70, so memories will have to suffice.

It was beautiful trail inside and out. We had our 1 year old son on my husband's back and were able to do about 95% of the cave until it was just too small to crawl through with a child on your back. the terrain is a but rough for a child under 4 to walk. We loved it.

hiking
12 days ago

This was beyond the MOST steps I’ve climbed in quite some time! Awesome views. Got to the top and there’s somewhere you can sit! Although about 0.25 miles away is the chimney tops itself, it was blocked off due to the fire. There is a gate blocking it off.

hiking
12 days ago

Such a beautiful trail. We hiked up on Saturday and couldn’t complete it due to a snow storm and little visibility. Definitely would recommend using yak tracks or micro spikes on a better day. There is snow and ice pretty much the entire trail. There were still quite a few people on the trail.

Went up today solo, got spooked for no reason and turned back until I met with another group and they were kind enough to let me join them. It was raining on and off and we ended up crossing through two waterfalls, be very careful with your footing or you may be swept away and unless you're super careful you will likely get wet regardless. I was able to do the whole trip without trekking poles or spikes though poles would have made at least one crossing easier. Today there was 1-2" of snow at the top and it did snow on us towards the top. Really a lovely hike and I look forward to going back in fair weather!

hiking
12 days ago

Can you say STAIRS, stairs, and some more STAIRS !
But TOTALLY worth the climb!!!! Absolutely beautiful!
You are literally on top of the world ☺️❤️.

hiking
13 days ago

A great day hike in the rain and snow.
There are two sections where the water is really flowing. The first one is quite deep, 90% of people turned back and didn't cross it that we saw.
The second one is easy, go up the hill 50 ft, it is only 2 foot wide, jump it.
Interesting easy hike. Can hear the I-90 freeway the whole hike, didn't like that.

Stair master climb. Top is awesome.

trail running
15 days ago

Good technical trail for running. A lot of gain on the way to the top. Will have to come back when its sunny and clear, nothing but most, rain and the occasional frozen rain waves. There are places snow is either on or next to the trail.

18 days ago

The rain has arrived. Trail was not really muddy or slippery, though the top was shrouded in clouds with zero views. Good exercise as usual. Tip for getting some view under such weather: at the UPPER talus loop trail junction take a detour onto talus loop trail. In about five minutes you will arrive at the talus pile. This is low enough that it can be below the clouds, but high enough to have a descent view.

Very slippery in winter, wear good shoes with grip. Husband slipped three times. Beautiful falls.

Great trail! Very rainy and foggy, but still amazing views and flora. It is longer than the beta shows. I got kind of confused between the water washes and the trail near the top and my phones GPS was not reading correctly.

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