RoadAheadNowCheck a route

I-15 · Utah

Salt Lake City to
St. George

I-15 runs from the Wasatch Front through central Utah before dropping toward the warmer southwest. Winter weather, wind and temperature can change materially across the route even when either endpoint looks quiet.

~300 miles ~4h 40m planning baseline 6 checkpoints
Check this route

THE DRIVE AT A GLANCE

Checkpoints that change the picture.

These are selected weather samples, not continuous monitoring of every mile.

  1. Salt Lake City

    ~0h from departure · Official point forecast

  2. Nephi

    ~1h 15m from departure · Official point forecast

  3. Fillmore

    ~2h 15m from departure · Official point forecast

  4. Beaver

    ~3h 5m from departure · Official point forecast

  5. Cedar City

    ~3h 55m from departure · Official point forecast

  6. St. George

    ~4h 40m from departure · Official point forecast

Know the limits of this route check.

Live road closures, camera feeds and observed pavement conditions are not integrated for this route. Use the official road-authority links above. NWS weather coverage depends on a successful, current response at each checkpoint.

See data sources & coverage

KEEP PLANNING

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I-80

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Also browse:I-15 selected-corridor planner →

ROUTE INTELLIGENCE

Know the route, the handoffs and the blind spots.

Everything below comes from the fixed corridor catalogue and verified source scope — not a generic interstate claim.

Compare departure windowsBudget & breaksCompare corridor facts →
One-way baseline~300 mi

Rounded corridor distance, not address-to-address routing.

Driving baseline~4h 40m

Before stops, congestion or closure delay.

Weather samples6

Selected checkpoints with arrival-time forecasts.

State handoffs1

Utah

OFFICIAL SOURCE HANDOFF

Every state still has its own road authority.

Opening a source is not the same as integrating its live feed. The status below says exactly what RoadAheadNow does.

UDOT TrafficUtahOFFICIAL LINK

QUICK ANSWERS

What this route page can — and cannot — tell you.

Does RoadAheadNow confirm that I-15 from Salt Lake City to St. George is open?

No. The weather comparison does not clear road access. Check the listed state road authorities for current restrictions, incidents and closures.

How many weather checkpoints are used between Salt Lake City and St. George?

This corridor uses 6 selected checkpoints over a rounded ~300-mile planning baseline. They are samples, not continuous coverage of every mile.

Which official road sources should I check?

The listed corridor crosses 1 state: UDOT Traffic (Utah). If your real route changes, check the authorities for the route you actually drive.

What road data is integrated on this page?

No live road-condition feed is integrated on this corridor; official road authorities are linked separately. NWS hourly weather and current official alerts are checked on request at the selected checkpoints.

Keep planning Salt Lake City to St. George.

Understand the public route facts or prepare your own budget and breaks. Neither action makes a live road-status check.

Compare corridor facts Build a trip plan

PUT THE INFORMATION TO WORK

Keep the next step close.

Data · STATE-LINE HANDOFFS

Multi-State Road Trips: Which Road Sources to Check

Build an official-source checklist for every state your corridor crosses, including short sections that endpoint-only planning can miss.

Read the guide

Planning · BEFORE YOU LEAVE

Road Trip Weather Checklist: Before You Leave

Review your route, arrival clocks, forecast gaps and official road sources in a practical order, then keep a private trip checklist.

Read the guide