I-15 Utah Road Conditions

I-15 crosses 401 miles of Utah, between the Arizona line and the Idaho line. That is 28% of I-15's 1,433 miles.

Inside Utah it meets I-80 at Salt Lake City, I-84 West at Ogden, and I-70.

By mile marker, I-15 passes Saint George 7 · Provo 265 · Salt Lake City 308 · Ogden 343.

No full closures are reported on I-15 in Utah as of Oct 8, 2026 8:18 PM MDT, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.

NOAA 1991–2020 Climate Normals, from 3 weather stations in Utah. A dash is a figure that station does not report, not a zero.

Towns Along I-15 in Utah

From St. George to Garland, with the position of each town measured along this stretch itself — counted from the St. George end, not from a state milepost, so it will not match the numbers on the signs.

1. 6 mi St. George
2. 225 mi Nephi
3. 260 mi Springville 1.4 mi off the road
4. 265 mi Provo 2.2 mi off the road
5. 283 mi Lehi
6. 301 mi Taylorsville 2.5 mi off the road
7. 310 mi Salt Lake City 1.1 mi off the road
8. 325 mi Farmington
9. 337 mi Sunset
10. 344 mi Ogden 2.0 mi off the road
11. 350 mi Farr West
12. 383 mi Garland 1.4 mi off the road

Places from the US Census Gazetteer and population estimates, both public domain; distances measured along this page's own route geometry.

Utah Traction Law & Snow Tire Requirements

Utah's traction law can be in force before a single flake falls — UDOT may require compliance up to 24 hours ahead of a storm. What you need depends on what you drive rather than on which road you are on, and in the Cottonwood Canyons it depends on how worn your tires are.

What the traction law requires

On an all-wheel or four-wheel drive vehicle the minimum is mud and snow (M+S or M/S) tires on all four wheels. On a two-wheel drive it is three-peak mountain-snowflake tires on all four — a stricter tire for the vehicle that needs it more. Either way, traction devices count instead: UDOT's term covers tire chains, tire studs and snow socks, on at least the drive wheels.

Class 1

Trucks, buses and larger RVs only — anything over 12,000 lbs gross weight. A car is not affected.

Class 2

All vehicles, cars included. Your drivetrain decides which minimum applies to you.

Class 3

Big and Little Cottonwood Canyons, and the only level that measures your tires: at least 5/32-inch of tread on M+S or snow tires, or traction devices instead. The beacons at the canyon mouths flashing is what tells you it is on.

Enforcement

Non-compliance is a citation from local police — in the Cottonwood Canyons the Cottonwood Heights and Sandy City departments, with the Salt Lake County Sheriff's Office; UDOT does not publish a fixed amount.

How you will know it is active

• Road signs and message boards on the segment itself
• The flashing beacons at the mouths of Big and Little Cottonwood Canyons
• The UDOT Traffic app and UDOT's own social accounts

Which class is posted is UDOT's to decide and it can change a day before the weather does. This page does not carry it — UDOT Traffic ↗ is the authority before you set off.

Source: UDOT, checked August 26, 2026.

Related Roads

I-15 in Utah Road Weather FAQ

Is Interstate 15 in Utah closed right now?

No full closures are reported on I-15 in Utah. No lane closures or roadworks are reported either.

What are I-15 in Utah road conditions today?

The map on this page colors the route along I-15 in Utah by what is on the pavement right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Oct 8, 2026 8:18 PM MDT. Right now temperatures run from 68°F to 91°F and the strongest wind is 11 mph.

What is the Utah traction law?

On an all-wheel or four-wheel drive vehicle the minimum is mud and snow (M+S or M/S) tires on all four wheels. On a two-wheel drive it is three-peak mountain-snowflake tires on all four — a stricter tire for the vehicle that needs it more. Either way, traction devices count instead: UDOT's term covers tire chains, tire studs and snow socks, on at least the drive wheels.

What happens if you ignore the Utah traction law?

Non-compliance is a citation from local police — in the Cottonwood Canyons the Cottonwood Heights and Sandy City departments, with the Salt Lake County Sheriff's Office; UDOT does not publish a fixed amount.

Do I need chains to drive I-15 in Utah in winter?

Not always. It depends which of 3 requirements is posted: "Class 1" — trucks, buses and larger RVs only — anything over 12,000 lbs gross weight. A car is not affected. "Class 2" — all vehicles, cars included. Your drivetrain decides which minimum applies to you. "Class 3" — big and Little Cottonwood Canyons, and the only level that measures your tires: at least 5/32-inch of tread on M+S or snow tires, or traction devices instead. The beacons at the canyon mouths flashing is what tells you it is on.

How often are I-15 in Utah road conditions updated?

The road surface and weather layers are rebuilt whenever this page is opened with data more than ten minutes old, and refreshed on a schedule in between, so nothing here is more than about two hours old even on a road nobody has looked at. Closures and road blocks are re-imported from the state 511 feeds every fifteen minutes, and the written state-by-state summaries are refreshed daily. Every section on this page carries the time its data was fetched.