Driving
Longmont to Rapid City
Updated: 01 Jun 2026
The drive from Longmont to Rapid City is approximately 450 miles. You will head north through Wyoming and into South Dakota. The drive takes about 7 hours. You will pass through beautiful mountain scenery and vast plains. This route is perfect for those who enjoy nature and outdoor activities.
Total Distance: 725 km driving distance, 550 km straight-line air distance.
Fastest Way
Driving takes 7 hours via the most direct highway route.
Cheapest Way
Driving is the most practical way to reach Rapid City.
Compare Longmont to Rapid City Routes
Driving
Direct
Duration
7 hours
Avg Price
$90-$130 in fuel
Operator
Personal Vehicle
Route
I-25 North to US-18 East.
The drive through the Black Hills is beautiful but requires careful driving.
Travel Tips
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Rest StopsPlan your stops in larger towns like Cheyenne or Lusk.
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Speed LimitsObserve the speed limits, especially in mountain areas.
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SnacksPack plenty of water and food for the long drive.
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NavigationUse a GPS for easy navigation.
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TimingStart your drive early to avoid arriving in Rapid City at night.
Safety Tips
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WeatherBe prepared for sudden weather changes in the mountains.
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Road ConditionsWatch for wildlife on the road, especially at night.
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EmergencyCarry a winter emergency kit in your vehicle.
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CommunicationEnsure your phone is charged for navigation.
People Also Ask
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Is Rapid City a nice city?Yes, it is known for its history and outdoor recreation.
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How long is the drive?It takes about 7 hours.
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Are there tolls?No, this route is toll-free.
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What is the best route?I-25 to US-18 is the most direct.
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Is it safe?Yes, the highways are well-maintained.
Quick Info
- From Longmont, Colorado, United States
- To Rapid City, South Dakota, United States
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Modes
Best Time to Travel
Summer or early fall to avoid winter snow in the mountains.
Things to Do in Rapid City
1
Mount Rushmore
See the iconic monument carved into the mountain.
2
Badlands National Park
Explore the unique landscape of the badlands.
3
Crazy Horse Memorial
Visit the massive monument under construction.
4
Custer State Park
Enjoy the beautiful scenery and wildlife.
Tags
Longmont to Rapid City drive
I-25 to US-18 route
traveling to Rapid City
Colorado to South Dakota
best way to Rapid City
Longmont travel
Rapid City transport
driving to South Dakota
