Name: Coalton
Rating: 2.5

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Dogs Leashed

E-Bikes Allowed

E-bikes allowed per regulation: bouldercolorado.gov/guide/g…

Description

This section of trail is nothing special, but it makes up the southeast corner of the Dirty Bismarck ride. It allows riders to connect McCaslin and W 120th Ave. without riding any pavement.

Contacts

Local Club: Boulder Mountainbike Alliance

Nov 17, 2025: Trail Update: South St Vrain

Nov 14, 2025: Another Step Closer to new Betasso Connector

Oct 24, 2025: Boulder County Moves One Step Closer to a Safer Boulder-to-Betasso Connection

Land Manager: Boulder County, CO - Parks and Open Space

Shared By:

Michael Ahnemann with improvements by Austin Cowan

Full Details

Trail Ratings

2.5 from 19 votes

#10

in Marshall Mesa

#25227

Overall

2.5 from 19 votes

5 Star		11%
4 Star		16%
3 Star		11%
2 Star		42%
1 Star		21%

Trail Rankings

#10

in Marshall Mesa

#2,321

in Colorado

#25,227

Overall

4 Views Last Month

1,830 Since Mar 26, 2013

		44%
		38%
		13%
		0%
		6%
		0%

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Photos

May 22, 2018 near Superior, CO

Feb 26, 2018 near Superior, CO

Dirty Bismark heading west during a spring ride.

May 31, 2017 near Superior, CO

Sun setting this evening obscured by smoke from the wildfires in the north and west.

Aug 8, 2021 near Superior, CO

Looking east from the top of the hill, back to the Coalton Trailhead and car park.

Aug 8, 2021 near Superior, CO

2 Comments

Weather

Current Trail Conditions

All Clear 97 days ago

Update Conditions See History

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Check-Ins

Oct 10, 2025

Anonymous

Aug 8, 2021

Private User

May 2, 2021

Sean Marlow

Aug 1, 2020

Holly S

First ride on my bike on flat tires. Very hard, walked some 2.8mi

Sep 10, 2019

Marc Barnes

Aug 2, 2019

Ted Graham

Straight downhill to ride taking it "backwards" on an easy day.

Sep 6, 2018

Katie Purdy

Jul 1, 2018

Jill Henske Keyes

Jun 3, 2018

Jessica W

1st ride 2.8mi

May 6, 2018

Jake Oswald

Short decline/incline good training run for climbing

Nov 19, 2017

Reed Harrington

Mar 26, 2012

Ted Eliason 1

Basically a road 2.8mi — 0h 30m

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Coalton

“A mostly doubletrack/dirt road section connecting McCaslin Blvd with W 120th Ave. ”

2.8

4.5

5,949' 1,813 m

5,552' 1,692 m

398' 121 m

0' 0 m

3%

12%