Salt Lake City to Las Vegas — Weather & Driving Conditions
Driving from Salt Lake City, UT to Las Vegas, NV? This 426-mile route follows I-15. TripCaptain checks the weather at every stop along the way — not just at each end — so you can see where conditions change before you pick a departure time.
Quick answer
- Distance: 426 mi (685 km)
- Typical drive time: ~6 hr 30 min without stops
- Main highway: I-15
- Watch for: Heavy Snow, Flash Flooding, Extreme Heat
What to watch for on this route
In the planner, TripCaptain highlights forecast weather risks between Salt Lake City, UT and Las Vegas, NV and summarizes the analysis with a Hazard Score™ from 0 to 100. A higher score indicates lower forecast risk, without guaranteeing road conditions.
- Heavy Snow: I-15 climbs over high terrain near Cedar City, where winter snow and chain controls catch travelers off guard between two desert stretches.
- Flash Flooding: The Virgin River Gorge funnels desert downpours into flash floods; intense rain can close this narrow Arizona section of I-15.
- Extreme Heat: Summer temperatures near St. George and into Nevada exceed 43°C (110°F), raising the risk of tire blowouts and engine overheating.
When to go, season by season
- Spring (Mar–May): Excellent driving overall. Snow can still reach the Cedar City climb in March. Watch for gusty winds across open desert.
- Summer (Jun–Aug): Extreme desert heat south of Cedar City. Drive early or late, carry extra water, and watch for monsoon flash floods in the Virgin River Gorge.
- Fall (Sep–Nov): The best season — cooling desert temperatures and clear skies. The first mountain snow near Cedar City can arrive in November.
- Winter (Dec–Feb): The desert ends are mild, but the climb near Cedar City sees snow, ice, and chain controls. Check Utah and Nevada road conditions before driving.
Compare departure times
Open Salt Lake City to Las Vegas in the planner to check the forecast for your date and compare nearby hours within your plan's limits. Save the trip to follow changing conditions in Live Mode.
Fuel, EV range, and rest stops
See a weather-adjusted fuel or EV energy estimate for the drive, sensible break points across the 426 miles, and a packing list matched to the conditions ahead.
Ready to plan your Salt Lake City to Las Vegas trip?
Check forecast conditions along this route, compare nearby departure hours, and save your plan to follow changes in Live Mode.
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