Ask anyone who skis Colorado what the hardest part is and a lot of them won’t say the skiing — they’ll say I-70. The interstate funnels every Front Range skier through the same mountain corridor, and on a sunny weekend after a storm it can turn a 90-minute drive into four hours. You can’t avoid I-70, but you can absolutely out-smart the worst of it.
The worst times to drive (and the fix)
| Direction | Worst window | Beat it by |
|---|---|---|
| Westbound (to the mountains) | Sat & Sun ~7–11 a.m. | Be past Georgetown before 7 a.m., or leave after ~11 a.m. |
| Eastbound (back to Denver) | Sun ~11 a.m.–6 p.m. | Leave before ~11 a.m. or after ~6 p.m. — or ski Sunday and drive Monday |
| After a big storm | Any daylight hours | Expect closures and chain laws; add hours or wait it out |
Know the chain & traction laws
When it’s snowy, CDOT activates two levels on I-70:
- Traction Law (Code 15): every vehicle needs snow tires, a 4WD/AWD, or chains/traction devices — and tires need adequate tread.
- Passenger Vehicle Chain Law (Code 16): the strictest — every vehicle needs chains or an approved alternate traction device (like AutoSocks).
Getting caught without proper equipment (or spinning out and blocking a lane) carries steep fines. If you’re in a 2WD rental, carry traction devices and know how to put them on before you’re standing in a storm on the shoulder.
The chokepoints
Traffic reliably stacks up at a few spots: the climb up Floyd Hill (long-running construction), the Georgetown-to-Silverthorne stretch, the Eisenhower/Johnson Tunnel at the Continental Divide, and Vail Pass. Storms and crashes at any of these can back the whole corridor up.
Local tricks that actually work
- Ski midweek if you possibly can — Tuesday/Wednesday I-70 is a different world, and the mountains are emptier too.
- Stay overnight in Frisco, Dillon, or Silverthorne instead of driving back Sunday — the value of skipping the Sunday eastbound jam is hard to overstate.
- Watch COtrip (CDOT’s app/site) for real-time closures, chain laws, and cameras before you leave and along the way.
- Consider the bus: CDOT’s Bustang/Snowstang and some resort shuttles run the corridor — let someone else drive the storm.
- Carry a winter car kit — and never head up on empty; getting stuck for hours in a canyon is real. Our ski packing list covers what to bring.
Skip the drive: ski shuttles & transit
Don’t want to fight I-70 or drive through a storm? You have real options — and for a lot of visitors, letting someone else drive is the smartest move of the trip.
- Epic Mountain Express — the largest private shuttle from Denver International Airport to Summit County, Vail, and beyond, with door-to-door and shared-van service. The go-to if you’re flying in without a car.
- Summit Express & Peak 1 Express — Summit-County-focused airport shuttles serving Breckenridge, Frisco, Keystone, Copper, and the surrounding towns.
- CDOT Snowstang & Bustang — the state’s public buses. Snowstang runs direct weekend service to select resorts in season; the Bustang West Line runs the I-70 corridor year-round. Budget-friendly, and you skip the parking.
- Pegasus — CDOT’s newer shared-ride service connecting Denver with the Vail/Avon area along I-70.
- Free local shuttles — once you’re here, the free Summit Stage and town shuttles (Breckenridge’s Free Ride and others) get you around without a car.
Schedules, seasons, and booking change year to year — check each service before you plan.
I-70 ski traffic FAQ
What time should I leave Denver to beat I-70 ski traffic?
For weekend westbound, aim to be past Georgetown before about 7 a.m., or wait and leave after ~11 a.m. Coming home, leave the mountains before ~11 a.m. or after ~6 p.m. on Sundays — or ski Sunday and drive back Monday.
Do I need chains to drive I-70 to the ski resorts?
When it's snowing, yes — CDOT activates a Traction Law (snow tires, AWD/4WD, or traction devices) and, in worse conditions, a Passenger Vehicle Chain Law (chains or approved traction devices for all vehicles). Carry traction devices, especially in a 2WD rental, and know how to use them.
When is I-70 the worst for ski traffic?
Westbound Saturday and Sunday mornings (roughly 7–11 a.m.) and eastbound Sunday afternoons (about 11 a.m.–6 p.m.), and any daylight hours during or right after a big storm.
Is there a way to avoid driving I-70 to the resorts?
Somewhat — CDOT's Bustang/Snowstang buses and some resort shuttles run the corridor, and staying overnight in a Summit County town lets you avoid the worst same-day jams. There's no fast alternate highway; US-40 over Berthoud Pass serves Winter Park but is its own mountain drive.
Related: Colorado skiing guide · Epic vs. Ikon · Ski trip packing list · Summit County towns · Where to stay
Written by
Melissa
Melissa splits her year between Texas and Summit County, Colorado, where she has spent countless summers and winters hiking, skiing, fishing, and exploring the high country. She started Breckenmendations to help visitors make the most of Colorado's mountains with the gear, tips, and local know-how she wishes she'd had on her first trip up I-70.
Breckenmendations is written by locals who actually hike, ski, and explore Colorado — see how we pick what we recommend.