Driving I-70 to Breckenridge and Vail in Winter: Traction Law, Chain Law and Traffic Tips (2026–27)

Most trips from Denver International Airport to Breckenridge, Keystone or Vail run on I-70, one of the busiest mountain highways in the country. In winter it climbs past 11,000 feet at the Eisenhower Tunnel and crosses Vail Pass at 10,662 feet. Here is what to know before you drive it this season.

Colorado's Traction Law (Code 15)

From September 1 to May 31, CDOT can put the Traction Law into effect on I-70 between Dotsero and Morrison. That covers the whole drive from the Denver foothills to Summit County and Vail. When it's active, every vehicle needs one of these:

• Tires with at least 3/16 inch of tread that are winter, mud-and-snow (M+S) or all-weather rated

• A 4WD or AWD vehicle with at least 3/16 inch of tread

• Chains or an approved alternative traction device, such as an AutoSock

Drivers who aren't properly equipped can be fined more than $130, and more than $650 if their vehicle blocks the road.

Passenger Vehicle Chain Law (Code 16)

In severe storms, CDOT can activate the Passenger Vehicle Chain Law. It's the last step before the highway closes, and it applies to every vehicle, 4WD and AWD included: you need chains or an approved traction device. Many rental car companies restrict the use of chains, so check your contract before you count on them.

When I-70 traffic is worst

CDOT's ski-season guidance flags two windows to avoid:

• Westbound, to the mountains: Friday afternoons, roughly 2 to 7 p.m.

• Eastbound, back to Denver: Sunday afternoons and evenings, roughly 3 to 6 p.m.

Traffic can start building before noon on busy weekends. Leaving mid-week or early in the morning helps, and on Sundays, staying in the mountains for dinner can save you hours. On weekends and holidays, the eastbound Mountain Express Lane, a toll lane between Empire and Idaho Springs, opens during peak hours. In heavy traffic, CDOT may also meter vehicles at the Eisenhower-Johnson Memorial Tunnel.

Before you leave, check conditions at COtrip.org or in the COtrip app.

Winter driving checklist

• Check COtrip.org for closures, Traction Law and Chain Law alerts

• Make sure your tires meet the 3/16 inch tread rule

• Fill the tank and the washer fluid before leaving Denver

• Pack water, snacks, warm layers, a blanket and a phone charger

• Leave extra space between vehicles and give yourself extra time

• Drink plenty of water: the drive climbs from about 5,300 feet in Denver to more than 11,000 feet

When it makes sense to skip the drive

If you're landing at DEN after a long flight, traveling with kids or ski gear, or heading up on a storm weekend, a private shuttle takes the tires, chains, traffic and parking off your plate. Ski Lift Limousine drivers run I-70 all season in Sprinter vans and SUVs fitted with snow tires, and they track your flight so your pickup matches your actual arrival.

Routes: Denver Airport to Breckenridge · Denver Airport to Vail · Denver Airport to Keystone · Breckenridge to Vail. Get your price in the Ski Lift app.

I-70 winter driving FAQ

When is the Colorado Traction Law in effect on I-70?

It can be activated from September 1 to May 31 on I-70 between Dotsero and Morrison. CDOT announces it on COtrip.org and on highway message signs when conditions require it.

Is AWD enough for the Traction Law?

Yes, as long as the tires have at least 3/16 inch of tread. It is not enough when the Passenger Vehicle Chain Law (Code 16) is active; then every vehicle needs chains or an approved traction device.

How long does it take to drive from Denver Airport to Breckenridge in winter?

About 2 hours for the roughly 104 miles in good conditions. Weekend traffic and storms can add an hour or more.

How long does it take to drive from Denver Airport to Vail?

About 2 to 2.5 hours for roughly 120 miles in good conditions, crossing both the Eisenhower Tunnel and Vail Pass.

Sources: CDOT: How to avoid I-70 ski traffic and COtrip.org. Rules and schedules can change, so check CDOT before you travel.