Mosquito Pass

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4.7/5 (126 reviews)
Leadville, Colorado (Lake County)
Last Updated: 07/26/2023

Trail Information

Highlights

Altitude Category Icon Altitude
Camping Category Icon Camping
Iconic Category Icon Iconic
Mine Category Icon Mine
Overland Category Icon Overland
Rock Category Icon Rock
Scenic Category Icon Scenic
Mosquito Pass (elevation 13,185'), between Alma and Leadville, Colorado, is among the highest Colorado passes accessible to 4WD vehicles. The views from here are spectacular, especially in early autumn when the valley’s foliage begins to change color. The vibrant gold, amber, and green colors provide a stark contrast to the drab brown stone and paled grasses covering the high treeless ridges. Earlier in the summer, the alpine grasses and wildflowers are spectacular. However, check with the Forest Service District Offices because Mosquito Pass opens late due to snow blocking the road. Pike National Forest/South Park Ranger District (719) 836-2031 San Isabel National Forest/Leadville Ranger District (719) 486-0749

Trail Difficulty and Assessment

Trail Navigation

Mosquito Pass is a very rocky road. From east or west, the lower portions are mostly dirt and gravel. As you gain elevation, the rocks become larger (6" to 8" diameter). Several segments of the road are entirely covered in loose stones up to 10" diameter, giving the sensation of driving on bowling balls. At the highest elevations, there are numerous switchbacks, but all are sufficiently wide so as not to require three-point turns. At these locations, trail surface is exposed bedrock. Mosquito Pass also includes a few shelf road portions that preclude passing.

Trail Reviews

4.7/5 (126)
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3400
Open
Rated 5/5
Visited: 09/23/2023
Difficulty Accuracy: Spot On

This is a fun trail. It’s rocky and slow going at times but well worth the effort. The views were phenomenal, add in the rich mining history and you have the makings of an iconic Colorado trail.
Trail Review: Mosquito Pass - Tim N.
Trail Review: Mosquito Pass - Tim N.
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Open
Rated 5/5
Visited: 09/17/2023
Difficulty Accuracy: Harder

Wife and I drove (well, the wife did all the driving) Mosquito Pass from Alma to Leadville this afternoon. Beautiful day, all the snow from earlier in the week has melted and there is no snow on the road. We lived in Leadville about 20 years ago and used to run Mosquito Pass several times a year. I feel like the Alma side is MUCH more difficult that it was when we lived there. We agreed the Alma side is now a solid '4' vs the '3' we were expecting. Ran it solo with our '21 Jeep Wrangler Rubicon (Diesel). It's completely stock on the OEM 33" and we didn't have any issues. Few spots where I guided her through (especially big rock right after the false summit waypoint). As always, a beautiful drive and only a few other vehicles today.
Trail Review: Mosquito Pass - Matthew Griffin
Trail Review: Mosquito Pass - Matthew Griffin
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Open
Rated 5/5
Visited: 09/03/2023
Difficulty Accuracy: Harder

We went Leadville to Alma and it was a rocky ride but worth it because of the great views. A little tight on some of the shelf roads and scraped a little on the east side where i probably could have picked a better line?
Trail Review: Mosquito Pass - Bob Maloney
Trail Review: Mosquito Pass - Bob Maloney
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Rated 5/5
Visited: 09/03/2023
Difficulty Accuracy: Harder

Agree with the others saying that the difficulty is more like a 4. There are some bigger rocks to get over and some narrow spots between the edge of the trail and some boulders.
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Open
Rated 4/5
Visited: 09/02/2023
Difficulty Accuracy: Harder

I completely understand both perspectives as a driver and a passenger can be quite different. From the driver's point of view, this experience seems to be a lot of fun and enjoyable. On the other hand, the passenger (wife) didn't have the same level of enjoyment and felt tossed around quite a bit. If you're someone who loves the thrill of being in control behind the wheel, this activity is definitely for you. Driving from the east to west direction appears to be the optimal route, with the east side offering a more challenging and exciting experience. The uphill obstacles seem to add an extra level of excitement. However, it's important to note that as a passenger, this experience might not be as pleasant. The constant tossing around could potentially be uncomfortable, especially for those who prefer a smoother ride. It's worth considering the preferences and comfort of all passengers before embarking on this adventure. In the end, it's all about personal preference and what each individual is seeking from this experience. So, if you're someone who enjoys the thrill and adventure of being behind the wheel, this activity might be perfect for you. Just make sure to take into consideration the comfort of your passengers, especially if they prefer a more relaxed ride.
Trail Review: Mosquito Pass - Scott Core

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