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For additional, more comprehensive material than I could ever provide
on the trails I have listed below as well as on other Colorado 4WD trails,
I highly recommend 4WD Adventures: Colorado (pictured below) by
Peter Massey and Jeanne Wilson (or their three regional volumes of the
state) and Guide to Colorado Backroads & 4-Wheel Drive Trails
by Charles Wells, who has two volumes which cover the southern (pictured
below) and northern part of the state. Both series compliment each other
very well.
The ratings I have posted are using Colorado's 10-scale.
Also, I should mention that scenic trails outweigh the technical stuff for me in terms of my preference and what I have driven to this point. My 4Runner is capable enough for all but only eight trails (more extreme in nature) in the state, which is good enough for me, especially since those last ones offer no additional scenic value over their adjacent roads. Over time, I'm sure I'll have reports here that will be the most challenging for my vehicle, but until then, it's not the destination, but rather, the journey for me.
I have a lot of updates that should be added, both adding or replacing galleries in the existing write-ups and adding a number of trails I don't have listed yet. I'll work on them as time and motivation allow.
Let's
get going! 
San Juan Mountains
Arrastra
Gulch & Little Giant Basin
Black Bear Pass
Burns Gulch
California
& Hurricane Passes
Corkscrew Gulch
Engineer
Pass
Eureka Gulch
Governor Basin
Imogene Pass
Kendall Mountain
Kennebec
Pass
Ophir Pass
Stony Pass
2002 Colorado 4Runner Jamboree
Elk Mountains
Lead King Basin
Pearl Pass with Montezuma
Basin
Reno
Divide with American Flag Mountain
Schofield
Pass
Taylor Pass
Sawatch Range
Baldwin
Lakes
Hancock
Pass
Iron
Chest
Mt.
Antero
Pomeroy
Lakes
Tincup
Pass
Tomichi
Pass
Sangre de Cristo
Mountains
Hayden Pass
Hermit Pass
Medano
Pass
Trinchera
Peak
Front Range
Argentine
Pass
Bald
Mountain snow run
Castle Gulch
China
Wall
Glacier
Ridge with SOB Hill
Radical
Hill
Red
Cone
Saints
John Road
Santa
Fe Peak
Webster Pass
Yankee Hill snow run
Mosquito
Range
Mosquito
Pass
Mt. Bross
Elkhead Mountains
Ellis
Jeep Trail
New Mexico
Goose Lake, Red River
Utah
Chicken
Corners with Hurrah Pass
Lockhart
Basin
White Rim