Do you need tire chains to drive around Durango?
On a normal day, no. The rules only kick in when the Colorado Department of Transportation (CDOT) turns them on. CDOT says it can activate a Traction Law or Chain Law on any state highway, and it warns drivers with highway signs, COtrip.org and text or email alerts.
Durango's own streets are a separate matter. CDOT plows state highways, and cities plow their own local roads. So the law matters most when you leave town on a state road, like US 550 north toward Silverton. That route climbs over Coal Bank Pass, which tops out at 10,640 feet, according to Wikipedia's summary of USGS data. The drop on the south side toward Durango is steep.
What does the Traction Law require?
It depends on what you drive. Here's the short version, from the Colorado State Patrol and CDOT:
- AWD or 4WD: tires with at least 3/16 inch of tread that are rated mountain-snowflake, M+S or all-weather. Or chains, or an approved traction device, on two or more drive tires.
- 2WD: no tire-only option. The State Patrol says that under SB25-069, a two-wheel-drive vehicle needs chains or an approved device on two or more drive tires when the law is active. Better tires don't change that.
Does all-wheel drive get you out of it? Not by itself. CDOT's own FAQ says AWD and 4WD comply only if every tire has the minimum tread. It also says that when it comes to stopping or turning, nothing matters more than your tires.
What is the Chain Law?
This one is the last step before a road closes. CDOT calls the Passenger Vehicle Chain Law its final safety measure in a severe storm. While it's on, every vehicle needs chains or an approved alternative traction device. Good tires don't get you out of it. Cable chains and tire socks like AutoSock are on CDOT's approved list, so check yours before you buy.
What if you drive a truck or tow a trailer?
Trucks play by different rules. Under the State Patrol's commercial-vehicle rule, anything over 16,000 pounds used in commerce, or carrying 16 or more people with the driver, must carry chains from September 1 to May 31 on listed roads. All of US 550 is on that list. A pickup towing a trailer can land under the rule too if it meets the weight test.
How much is the ticket?
That depends on which official page you read, and that's worth knowing. CDOT's Traction Law page lists a $100 fine plus a $33 surcharge, rising to $500 plus $157 if you block a travel lane. A November 2025 CDOT news release says $50 plus $17. The State Patrol's chain-law page says up to $500 plus a $79 surcharge, or $1,000 plus $157 if you're stuck and blocking the road.
So which number applies? We can't say. What CDOT's FAQ does say is that troopers enforce these laws as a secondary offense. They can cite you only if you crash or hold up traffic.
What else should you carry in winter?
CDOT's winter-driving advice is plain. Pack a first aid kit, extra water and a snow emergency kit. Clear the snow and ice off your car before you go, and give plows three to four car lengths of room (CDOT). Passing a snowplow that's running in tandem formation is a Class A offense under Colorado's Tandem Snowplow Law. CDOT also tells drivers to avoid the brunt of a storm if they can.
Check your tread before the first storm, on all four tires. The 3/16-inch minimum applies to every one of them, and CDOT's Winter Wise campaign hands out "Check Your Tread" cards at its events.
How do you check conditions before you go?
Use COtrip.org or call 511. You can also sign up for CDOT alerts by text or email. Check before every winter trip over a pass, not just the big storms. Our guide to Durango in winter covers what locals pack, and the answer on how cold Durango gets gives the winter temperature numbers.