How far is Boulder, MT from Helena, MT?
The driving distance from Boulder, MT to Helena, MT is about 30 miles (48.3 km), with a travel time of about 00h 32m by car.
- The straight-line flight distance is about 24.9 miles (40.1 km).
- For a round trip, plan for roughly 01h 04m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM MDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 32m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Light Rain then Showers And Thunderstorms
Chance Light Rain then Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Boulder and Helena.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boulder and Helena.
-
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
26.6 mi · 25 min
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5
Take the exit slight right toward I 15 Business, US 12, US 287: Townsend, Capitol Area
1583 ft · 41 sec
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6
Continue on Prospect Avenue
1.2 mi · 3 min · Prospect Avenue
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7
Turn left onto North Montana Avenue
146 m · 18 sec · North Montana Avenue
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8
Turn right onto 11th Avenue
1.3 km · 2 min · 11th Avenue
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9
Turn right onto Cruse Avenue
50 m · 6 sec · Cruse Avenue
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10
Arrive at your destination
0 m · 1 sec · Cruse Avenue
Car Route Details
A richer read on the saved driving route between Boulder and Helena.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
North Main Street
Merge slight left
26.6 mi · 00h 25m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Chance Light Rain then Showers And Thunderstorms leaving Boulder and Chance Light Rain then Showers And Thunderstorms near Helena.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boulder to Helena?
The road trip is about 30 miles (48.3 km) and usually takes 00h 32m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Clancy is a useful midpoint, sitting about 15 miles from Boulder and 15 miles from Helena.
How much longer is the road route than the straight-line distance?
The direct path is about 24.9 miles (40.1 km), while the road route adds roughly 5.1 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 7:00 AM to 7:00 PM MDT. If you want a more comfortable same-day return, try to leave by 7:26 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.13 one way or $8.25 round trip. Estimated CO2 is about 9.4 kg one way.
What should you check before leaving?
Before you leave, expect Chance Light Rain then Showers And Thunderstorms around Boulder and Chance Light Rain then Showers And Thunderstorms near Helena.
Stop Ideas Near Clancy
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 Clancy.
Butte, MT
Bozeman, MT
Flight Path Map
This map shows the direct air route between Boulder and Helena. Straight-line distance: 24.94 mi (40.13 km).
#1 Boulder
Town in Montana
| Population | 1,291 |
| Coordinates | 46.2365900, -112.1208300 |
| Altitude | 1496 |
| Country | United States |
#2 Helena
State capital of Montana, United States and seat of Lewis and Clark County
| Population | 33,737 |
| Coordinates | 46.5927100, -112.0361100 |
| Altitude | 1237 |
| Country | United States |
End: Cruse Avenue (-112.036062, 46.592722)
Estimated Travel Time
Distance: 48 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 00m |
| 40 mph (64.37 km/h) | 00h 45m |
| 50 mph (80.47 km/h) | 00h 36m |
| 60 mph (96.56 km/h) | 00h 30m |
| 70 mph (112.65 km/h) | 00h 25m |
| 80 mph (129 km/h) | 00h 22m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $4.13 | $8.25 |
| Mid-grade | $4.23 | $4.48 | $8.97 |
| Premium | $4.55 | $4.82 | $9.64 |
| Diesel | $5.41 | $5.74 | $11.47 |
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.