How far is Boulder, MT from Great Falls, MT?
The driving distance from Boulder, MT to Great Falls, MT is about 117 miles (188.3 km), with a travel time of about 01h 44m by car.
- The straight-line flight distance is about 95.5 miles (153.7 km).
- For a round trip, plan for roughly 03h 28m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 01h 44m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
State capital of Montana, United States and seat of Lewis and Clark County
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Light Rain then Showers And Thunderstorms
Partly Sunny then Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between Boulder and Great Falls.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boulder and Great Falls.
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1
Start on West Centennial Avenue
112 m · 16 sec · West Centennial Avenue
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2
Turn left onto North Main Street
1.1 km · 1 min · North Main Street
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3
Take the ramp right toward Helena
1284 ft · 31 sec
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4
Merge slight left
113.2 mi · 1 hr 49 min
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5
Take the exit slight right toward I 15 Business, US 89 South, MT 200 East
2016 ft · 49 sec
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6
Continue on Country Club Boulevard
1.4 mi · 2 min · Country Club Boulevard
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7
Continue on 10th Avenue South
1.1 km · 58 sec · 10th Avenue South
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8
Turn left onto 4th Street South
2216 ft · 2 min · 4th Street South
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9
Arrive at your destination
0 m · 1 sec · 4th Street South
Car Route Details
A richer read on the saved driving route between Boulder and Great Falls.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Helena
Merge slight left
113 mi · 01h 49m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Chance Light Rain then Showers And Thunderstorms leaving Boulder and Partly Sunny then Showers And Thunderstorms Likely near Great Falls.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boulder to Great Falls?
The road trip is about 117 miles (188.3 km) and usually takes 01h 44m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Helena is a useful midpoint, sitting about 58.5 miles from Boulder and 58.6 miles from Great Falls.
How much longer is the road route than the straight-line distance?
The direct path is about 95.5 miles (153.7 km), while the road route adds roughly 21.5 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 8:00 AM to 10:00 AM MDT. If you want a more comfortable same-day return, try to leave by 3:02 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $16.08 one way or $32.16 round trip. Estimated CO2 is about 36.7 kg one way.
What should you check before leaving?
Before you leave, expect Chance Light Rain then Showers And Thunderstorms around Boulder and Partly Sunny then Showers And Thunderstorms Likely near Great Falls.
Stop Ideas Near Helena
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Helena.
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Flight Path Map
This map shows the direct air route between Boulder and Great Falls. Straight-line distance: 95.52 mi (153.72 km).
#1 Boulder
Town in Montana
| Population | 1,291 |
| Coordinates | 46.2365900, -112.1208300 |
| Altitude | 1496 |
| Country | United States |
#2 Great Falls
Town in Cascade County, Montana, United States
| Population | 58,353 |
| Coordinates | 47.5002400, -111.3008100 |
| Altitude | 1015 |
| Country | United States |
End: 4th Street South (-111.300848, 47.50024)
Estimated Travel Time
Distance: 188 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 53m |
| 40 mph (64.37 km/h) | 02h 55m |
| 50 mph (80.47 km/h) | 02h 20m |
| 60 mph (96.56 km/h) | 01h 57m |
| 70 mph (112.65 km/h) | 01h 40m |
| 80 mph (129 km/h) | 01h 27m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $16.08 | $32.16 |
| Mid-grade | $4.23 | $17.47 | $34.95 |
| Premium | $4.55 | $18.79 | $37.57 |
| Diesel | $5.41 | $22.35 | $44.70 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Montana · Apr 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.