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Guide To Backpacking The Maroon Bells Four Pass Loop

The Maroon Bells Four Pass Loop is 1 of the most stunning backpacking trips in North America! Here are our essential tips for planning this backpacking trip and for hiking all four of these strenuous mountain passes (P.S. You can do it in 1 day).

This blog was updated in March 2023 for accuracy and updated info on the new permit requirement.

There are many great blogs that I mention at the bottom with detailed descriptions of how to hike the Four Pass Loop at Maroon Bells. However, in this blog, I want to give you tips for planning your trip and for when you are on the trail. There were things I was worried about and these tips would’ve helped me a lot when I was planning our trip especially since I’m fairly new to backpacking. 

Overview Of Backpacking The Maroon Bells Four Pass Loop

Length: 26.7 mile loop
Elevation gain/loss: 7,500 feet

The trail is very well marked so you don’t need to worry too much about navigation. We average about 2 miles per hour and we were a little slower than that for this hike, probably due to the weight of our bags. 

This hike takes you through four valleys and to get from one valley to the next you need to go over the lowest point of the surrounding mountain ranges, or the “pass”.

The four passes in clockwise order are West Maroon Pass, Frigid Air Pass, Trail Rider Pass, and Buckskin Pass.

Each pass is over 12,000 feet high and for three of them, you must gain and then lose 3,000 feet to get over them.

It’s cruel torture, but oh so worth every grueling step.

Related: 7-Day Colorado Road Trip Itinerary

Getting a Permit to Backpack Maroon Bells Four Pass Loop

It is now required to get an overnight permit in advance.

Overnight Parking: Where to leave your car?

Where you decide to park depends on a few factors such as:

  • When do you want to start your hike?
  • How many days do you want to be in the backcountry?
  • Are you trying to save money?
  • Are you going on a popular weekend or a less crowded weekday?

We only wanted two nights/three days in the backcountry which meant we wanted to start our hike by 4 pm and be done by about noon the third day.

Important: You can only drive to the trailhead before 8 am and after 5 pm as the road to the trailhead is only open to busses and campers staying at the campground from 8-5.

Parking at Maroon Bells Trailhead – Least time consuming/most crowded option

We contemplated waiting to drive to the trailhead until after 5 pm but that meant we’d be risking the parking lot being full or not being able to find a parking spot for our large RV we were driving.

In retrospect, parking probably wouldn’t have been a problem for us after 5 pm on a Sunday (there were quite a few spots open when we arrived on the bus at 3:30) however, if we had waited to drive up at 5 pm, we probably wouldn’t have started on the trail until close to 6 pm and I don’t think we’d have made it to the campsites right before the first pass that I had hoped to get to. It is doable though, especially if you don’t intend on hiking very far on the first day.  More on this below.

Parking in Aspen + Bussing – Cheap option

We chose to save some money and park at Buttermilk Ski Resort. It’s only $6 per day there and you can hop on the free public Aspen bus to get to Aspen Highland where you will have to pay $8 per adult and $6 per child for a round-trip bus ticket to the trailhead.

Parking at Buttermilk is allowed for only 4 days though.  You can park at Aspen Highland (where you get on the bus) but it costs $25 per day on the weekend and $20 during the week so by parking at Buttermilk we save almost $50!

If you are trying to save time, parking up at the trailhead is a better option as long as you can time it before 8 am or after 5 pm and also get a parking spot.

I was surprised that there was plenty of parking on a Sunday afternoon in August and there would’ve been a place for my RV to park. The nice thing about parking up at the trailhead is that when you finish, you can jump right in your car and be on your way instead of taking a few hours for all the different buses when we finish Tuesday morning.

If you do park at the trailhead, you may have to pay $10/day if the ranger station is open. 

Getting To and From The Trailhead By Bus

How we did this was so easy! The bus stop is directly adjacent to the Buttermilk parking area.

To get to the Four Pass Loop trailhead:
  • We hopped on the free BRT bus towards Aspen and rode it just over a mile to the roundabout.
  • When you get off walk behind the bus (don’t cross the street) to the sidewalk and wait at the bus stop on the east side of the sidewalk. It’s pretty obvious. Then you get on the CM (Castle Maroon) bus which will take you for free to Aspen Highland. Both these buses were very short rides (5 minutes each). 
  • At Aspen Highland, you will be dropped off directly in front of the sports store. Walk in the revolving door to buy your tickets and the marked bus that’s directly in front of the building will take you up to the trailhead on a guided tour. 

If you are not used to using buses, use Google Maps when you get to the Buttermilk parking area it might help you feel reassured that you get on the right bus. Open up Maps and input Aspen Highland. Hit directions. Then tap the bus icon. It tells you which buses to look for and when they will arrive. 

To get back to Buttermilk:
  • If you leave your car there you’ll jump on the CM (Castle/Maroon) bus and get off at the roundabout.
  • Then, walk across the street and find the pedestrian tunnel that takes you under Highway 82. You’ll see the bus stop here and the BRT to Glenwood bus which comes by every ten minutes or so will bring you back to buttermilk. Remember to request the stop by pulling the cord when you see Buttermilk pop up.

Related: How to Use Your Smartphone as a GPS

It’s also important to note that there is more than one bus running on Highway 82 that can get you to and from the roundabout beside the BRT.  That is why we recommend using your Google Maps app to cross-reference which bus is fastest when you get there.

Storing Food

Bear canisters are required for all backpackers. Since we only carried one bear canister among 3 hikers, it was hard to fit enough food in it for all of us for two nights.

We didn’t bring rope to hang our bear canister however we met other hikers who didn’t hang their bear can and they said a bear moved theirs during the night (I don’t know if it’s true or not but just a warning). 

Carrying Water

We carried in two water bottles each plus one extra (a total of 7 water bottles) so we didn’t need to stop and fill water from the creek the first night. That gave us enough water to drink when hiking to the campsite, drinking water at the campsite, boiling water for pasta in our Jetboil, washing out the Jetboil, and making coffee in the morning.

When we started hiking day 2, we crossed a stream early on and refilled all 7 water bottles. We didn’t have our gravity bag and while that may have been helpful towards the end of the hike, our HydroBlu Clear Flow water bottles which have filters built-in seemed to be enough. You could easily bring a Gravity Bag instead and just use it to fill all the water bottles you’ve brought with you each time you get to a water-filling location.

We carry 4 Hydro Blu Clear Flows that have filters and then 3 backups that we pour into the filtering bottles when needed.

Overall, there aren’t a ton of places to get water but there are enough.  If you are hiking clockwise, there are places to fill water at these points:
  • If you are camping at Crater Lake campground, the only place to fill water is from Crater Lake which, due to the drought at the time of hiking in 2018, is more like a pond than a lake in the fall.
  • Mile 4.5: When you cross the stream from west to east
  • There is nowhere to get water between West Maroon (Pass 1) and Frigid Air Pass (Pass 2)
  • Mile 12: After you descend from the 2nd pass through Fravert Basin, you’ll enter a forest.  A long 3-mile descent will bring you to a river crossing where you’ll have to remove your shoes and cross the frigid waters.
  • Mile 15.5:  When you crest the incredibly steep hill and the final stretch of Trail Rider Pass comes into view, you will also have an incredible Snowmass Peak towering above a small lake.  If you must, you can fill water from this pond.
  • Mile 17.5: After descending Trail Rider Pass, Snowmass Lake is your next water source
  • Mile 18.5: A mile after leaving Snowmass Lake you’ll cross a creek on two large logs.  This is a good spot to fill water and is the last good water source for a while.
  • Mile 22.8: .8 miles after descending Buckskin Pass and just after the junction to Willow Pass (stay right), there is a straightaway descent and there will be a wide-open space for camping.  To get to that site you have to hop over a stream.  The stream isn’t large but it’s sufficient if you need water.
  • Mile 23.5: A mile and a half from Buckskin Pass, you will cross a stream and though the stream may be running very small in late summer, you can still fill here if you need to.

Backpacking Pack List

Download our free backpacking pack list.

Dehydrated meals may be better for this type of trip just to save space. I’m not a fan of dehydrated meals and I prefer having whole foods but that made it hard to fit it all in the bear canister.

Important: It’s really cold at 10-12,000 feet (duh). The forecast for Aspen said a high of 70-80 and a low of 48. Reasonable. Except Aspen is 3000 ft lower than where we camped. Bring gloves! You will need them if you’re hiking early in the morning or late in the day and if not they’re helpful for when you’re sleeping.

I wish I had had my Woolx baselayers & socks with me!

I’ve also since upgraded to this sleeping bag and am much happier and warmer when backpacking!

Related: Ultimate Backpacking Pack List

Maroon Bells Four Pass Loop Campsites

There are a few regulations about backcountry camping and campfires that you have to follow:

  • Camping is not allowed within one hundred (100) feet of any lake, stream, or trail
  • Camping is prohibited within 1/4 mile of Crater Lake or Snowmass Lake except for designated campsites. In addition, campfires are not permitted within 1/4 mile of Crater Lake or Snowmass Lake.
  • Camping and campfires are not allowed within 100 feet of a water source such as lakes or streams
  • Campfires are not allowed above 10,800 ft. elevation

Related: Things To Do Along The Million Dollar Highway

Do The Four Pass Loop Clockwise

Right before Crater Lake, there is a sign to go left on Trail 1970 if you are hiking clockwise, or right on Trail 1975 toward Buckskin Pass if you are going counterclockwise.

I was very happy hiking it clockwise because then the views continuously get better throughout the hike.

Also, coming up Trail Rider Pass from the valley is super steep so I preferred doing that section uphill only because I think it would’ve hurt worse downhilling it.

In my opinion, Trail Rider Pass to Buckskin Pass was the best part on the Four Pass Loop but honestly, the whole thing is incredible so don’t worry too much about the direction, just leave enough time to take in the views at the bottom of lake and by the lake below Trail Rider Pass. 

Here’s our itinerary of how long it took us to hike each section an where we camped.  We did also include distances, elevation gain, and other recommended camping spots because while we had an epic time, hiking all 4 passes in 1 day is hard.  

On the other hand, if you follow our itinerary you get total Badass cred to say you hiked all 4 passes in 1 day with a heavy backpack.

3-Day Four Pass Loop Backpacking Itinerary

Day 1- Trailhead To Our First Backcountry Campsites

Maroon Bells Trailhead to Crater Lake campsites: 2 miles, 800 feet elevation gain, 1:00 hour
Crater Lake campsites to first Backcountry campsites: 2 miles, 800 feet elevation gain, 1:15 hours

When you start the hike it’s very straightforward. Follow the signs for Crater Lake and it will take you about an hour to get to the lake since it’s pretty steep and rocky right from the get-go.

There were many designated campsites right by the lake (and almost all were open on a Sunday night). They are numbered 1-11. If you start late and are worried about how far you can make it before nightfall; this is an easy place to camp if you just want to get out there and start your adventure. 

Crater Lake, Backpacking the Maroon Bells Four Pass Loop
Crater Lake

Like I said, we wanted to cover more ground, which I’m glad we did because there isn’t as huge of a wow factor between Crater Lake and the first pass. Plus, it’s a solid climb the whole way up to the first pass and it was nice to get most of the ascent done with that first night. 

As you leave Crater Lake you will be hugging the right side of the valley for the next 5.5 miles. About an hour past Crater Lake, you will reach the first creek crossing at 3.5 miles. When we were there the creek was very low but it’s obvious by the number of rocks lining the creek bed that at certain times of the year it is a huge creek. 

Preparation: Pack essentials for changing conditions; weather can shift quickly in the area.

Over that hour, after you pass designated campsites at Crater Lake, you’ll hike past all the rock scree at the base of the Maroon Bells.  About an hour past Crater Lake, you will reach the first creek crossing at 3.5 miles. When we were there the creek was very low but it’s obvious by the number of rocks lining the creek bed that at certain times of the year it is a huge creek.

After that, you will start a steady ascent up through willow trees and shrubbery, then finally you get to a patch of pine trees that have some nice campsites. This is where we chose to spend our first night and it was almost precisely at mile 4.  It was a pleasant spot to pick but if I had known there were campsites closer to the first pass, I would’ve pushed on and slept as close to the pass as I could.

Backcountry camping, Backpacking the Maroon Bells Four Pass Loop
The first backcountry camping spot at mile 4

There are quite a few sites 1/2-1 mile before the summit of Maroon Pass that looked even more stunning but remember, the higher you get, the colder it becomes at night.  When hiking past those sites the next morning we saw everyone’s tents covered in frost.

We didn’t get much sleep because of the cold and when we hiked past the tents higher up the next morning we noticed how much ice was on them. (See packing tips below)

Day 2: Over All Four Passes In One Day

6:00-8:00 am
First Backcountry Campsites (Mile 4) to West Maroon Pass: 2.5 miles, 2000 feet elevation gain

From where we slept the first night to the top of the pass was about 2.5 miles and took exactly 2 hours. There was one creek crossing early on where we refilled all our water bottles and that lasted us until the creek by Fravert Basin at about noon that day.

Going over the pass is exhausting. You gain the last 800 ft in .7 and your legs feel it.

At the top of the pass, we dropped our bags and scrambled up the rocks to the left to take in the gorgeous views that extend south to Crested Butte and beyond. A great 15-minute detour if you ask me. 

West Maroon Pass, Backpacking the Maroon Bells Four Pass Loop

Related: 7 Epic Things to do in Crested Butte

8:15-10:00 am

West Maroon Pass to Frigid Air Pass: 2.4 miles, 800 feet elevation loss, 700 feet elevation gain

Descending West Maroon Pass, Backpacking the Maroon Bells Four Pass Loop
Descending West Maroon Pass,

The downhill off the pass was quick and the views started getting good. It was a pretty short 1 hour and 45 minutes to cover the 2.4 miles from Maroon Pass to Frigid Air Pass.  The only really hard part is the last 15 minutes to the top of Frigid Air Pass.

There are signs marking the trail but remember there will be two junctions and both times you go right.  The second right is where a pond used to be but it was completely dried up when we were there.

Base of Frigid Air Pass, Backpacking the Maroon Bells Four Pass Loop
Junction at the base of Frigid Air Pass where a pond used to be

Take in the views from the top and power up with a snack and a second cup of coffee because the next seven miles to Trail Rider pass is long.  Some parts get quite boring and some, extremely hard.

Frigid Air Pass, Backpacking the Maroon Bells Four Pass Loop
Frigid Air Pass

Frigid Air Pass to River Crossing: 4 miles, 1900 feet elevation loss

The descent to Fravert Basin campsite is 4 miles and took us exactly 2 hours.

Fravert Basin, Backpacking the Maroon Bells Four Pass Loop

It was 1.3 miles to get to the forest (this section had some great campsites if you are making this a longer hike) and then another 1.4 to get to the waterfall that drops into the lower basin. There are even better campsites with views of the waterfall here.

A short stint here will get you to a creek crossing that we did have to take our shoes off for. This is where we also refilled our water bottles again.

River Crossing, Backpacking the Maroon Bells Four Pass Loop
River crossing
River Crossing to Trail Junction: .9 miles, 200 feet elevation loss

Next, it’s .9 to get to the junction where you go right towards Trail Rider Pass, and here’s where the fun begins. Fuel up, and take your electrolytes so you can power up the next one-hour climb.

1st trail junction, Backpacking the Maroon Bells Four Pass Loop
When you reach this trail junction, it’s time for the steep ascent
1st Trail Junction to 2nd Trail Junction: 1 mile, 1100 feet elevation gain

It took us exactly 1 hour and 10 minutes to climb the one mile from the start of the hill to the junction for Geneva.

By the time you reach this junction, you think you have to be at the pass and can’t imagine climbing more but you’re just getting warmed up!  Be warned, even though you’ve been climbing a steep trail for more than an hour, you’ve still got over an hour to the top of Trail Rider Pass on equally as steep terrain. 

Lead King Basin, Backpacking the Maroon Bells Four Pass Loop
Lead King Basin

2nd Trail Junction to Lead King Basin: .5 miles, 200 feet elevation gain

It took us 25 minutes to get to the lake where we rested for 15 minutes and took in the best views of the entire hike. I love alpine lakes and this one did not disappoint. If you want to extend your adventure, camp on the small lake here for a night. 

Little lake in Lead King Basin, Backpacking the Maroon Bells Four Pass Loop
The little lake in Lead King Basin
Lead King Basin to Trail Rider Pass: .6 miles, 700 feet elevation gain

From the lake, it took us 40 minutes to get to the top of Pass, and seeing the view of Snowmass Lake after three hours of climbing felt like we had just reached heaven. We again rested for ten minutes while taking in the views of the two lakes on each side of the pass. It was mind-blowing!

final ascent of Trail Rider Pass, Backpacking the Maroon Bells Four Pass Loop
The final ascent of Trail Rider Pass, Backpacking the Maroon Bells Four Pass Loop

Trail Rider Pass to Snowmass Lake: 2.2 miles, 1500 feet elevation gain

It was just a little over an hour to descend the 2+ miles to Snowmass Lake during which you have insanely beautiful views of the Lake.

Snowmass Lake, Backpacking the Maroon Bells Four Pass Loop
Snowmass Lake
Dinner and chill at Snowmass Lake

We followed the sign toward the campground at Snowmass Lake but only to give us a spot to sit for almost an hour to prepare dinner and take pictures. 

Snowmass Lake, Backpacking the Maroon Bells Four Pass Loop
Snowmass Lake


Snowmass Lake to Buckskin Pass: 3.8 miles, 1700 feet elevation gain

We wanted to go for all four passes in one day.  There was rain in the forecast for the next day and we didn’t like the idea of crossing the last pass in possible lightning storms so we decided to push on and hoped we could make it over the last pass and find a campsite before it was dark. (We barely made it btw)

Head back to the sign junction where you turned to Snowmass Lake and this time head on the for Maroon Snowmass Trail.  Follow it through some mellow forest trails before two even steeper but much shorter climbs. It was 6 miles to go from Snowmass Lake to the first campsite on the other side of Buckskin Pass and it took us three hours. 

It takes only an hour and a half to get to the top of the first climb.  This is the point where you leave the safety of the forest and campsites, which meant getting over the pass and down to the next set of campsites took another hour and a half. This is good to remember in case nightfall is approaching and you aren’t sure if you’ll make it to the next campsite. There isn’t anywhere to camp in between these two spots. 

Ascending Buckskin Pass, Backpacking the Maroon Bells Four Pass Loop
Ascending Buckskin Pass

Buckskin Pass to Treeline (first campsites): .8 miles, 700 feet elevation loss

Buckskin Pass, Backpacking the Maroon Bells Four Pass Loop
Buckskin Pass

Once you arrive at the top of Buckskin Pass it’s only 4.6 miles back to the trailhead.

The trail descends quickly down switchbacks into a steep gulch. After .7 you’ll pass a trail junction to Willow Pass where you keep right, heading for the tree line that harbors great campsites. This is where we spent our second night. 

Descending Buckskin Pass, Backpacking the Maroon Bells Four Pass Loop
Descending Buckskin Pass into the Gulch

Day 3: A Quick and Easy Descent

Treeline (first campsites) to Trailhead: 3.8 miles, 2200 feet elevation loss

We woke to the sound of rain and thunder the next morning and were glad we didn’t have any passes to cross.  It was only 3 miles back to the trailhead but with tired feet, it felt like forever. 

The final 4 miles, Backpacking the Maroon Bells Four Pass Loop
The final 4 miles

Luckily the rain didn’t last long and the clouds stayed high allowing us to soak in the gorgeous mountain views for our final hour and a half hike back to the start. We were a little early for the bus so we had to wait at least 45 min plus the 20 min ride back to Aspen Highlands. 

The Maroon Bells, Backpacking the Maroon Bells Four Pass Loop
The Maroon Bells at dawn

There you go. All our insider knowledge into backpacking Maroon Bells Four Pass Loop. It was wonderfully hard and stunning but next time I plan on thru-hiking it from Crested Butte to Maroon Bells trailhead via the Trail Rider/Snowmass side. No offense to West Maroon Pass but I liked that side a lot more.  

Related: How To Train For A Strenuous Hike

Fit to hike, hiking training program

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