Travel Center

Colorado's Chain Law

September 1st to May 31st all commercial vehicles traveling on I-70 between milepost 133 (Edwards exit) and milepost 259 (Morrison exit) must carry sufficient chains to be in compliance with the Colorado chain law. The law requires commercial vehicles to carry chains on this segment of I-70 from September 1st to May 31st each year.

Chains Required SignWhy is the Chain Law Necessary?
Chains help commercial vehicles traverse the steep climbs often present in the high country.  Without chains, vehicles often become disabled, causing traffic delays and sometimes road closures.  For the safety of the traveling public, it is critical to utilize chains to be in compliance with Colorado’s chain law.

Commercial Vehicle Definition
Colorado’s chain law applies to all state, federal and Interstate highways and was initially enacted in 1996. Colorado’s chain law defines commercial vehicles as being used in commerce to transport passengers or property and fitting into one of the following categories:

  • Gross combination weight rating of 26,001 or more lbs. inclusive of a towed unit which has a gross vehicle weight ration of more than 10,000 lbs
  • Gross vehicle weight rating of 26,001 or more lbs
  • Designed to transport 16 or more passengers, including the driver

What About Passenger Vehicles?
A chain law restriction for vehicles weighing less than 26,001 lbs. including passenger vehicles, crossovers, SUVs, and small trucks can be put into effect in Colorado at any time when weather conditions are severe, primarily on roadways with significant ascending and descending grades.

Stay Informed
The chain law can go in effect at anytime between Sept. 1 and May 31.  To stay informed about road conditions, road closures and the chain law, sign up for email and text message alerts.

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Colorado: The Official State Web Portal