How far is Boise, ID from Ennis, MT?
The driving distance from Boise, ID to Ennis, MT is about 432.1 miles (695.4 km), with a travel time of about 07h 26m by car.
- The straight-line flight distance is about 251 miles (403.9 km).
- For a round trip, plan for roughly 14h 52m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 07h 26m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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.
City in Idaho
Route Weather Snapshot
Check the forecast at both ends before you head out.
Patchy Smoke then Sunny
Driving Route Map
The map below follows the saved road route between Boise and Ennis.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boise and Ennis.
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1
Start on the route
36 m · 11 sec
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2
Turn right
80 m · 21 sec
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3
Turn right onto South 6th Street
849 ft · 39 sec · South 6th Street
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4
Turn left onto West Myrtle Street
1 km · 1 min · West Myrtle Street
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5
Turn right onto South Broadway Avenue
2.8 mi · 6 min · South Broadway Avenue
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6
Take the ramp left toward I 84 East
2049 ft · 46 sec · Idaho Medal of Honor Highway
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7
Continue on Vietnam Veterans Memorial Highway
166.5 mi · 2 hr 36 min · Vietnam Veterans Memorial Highway
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8
Continue straight
62.7 mi · 59 min
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9
Keep slight left to continue on Idaho Falls
3046 ft · 40 sec
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10
Merge slight right
46.3 mi · 44 min
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11
Take the exit slight right toward US 20 East, I 15: Rigby, West Yellowstone
1434 ft · 35 sec
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12
Continue on Rigby Highway
3.1 mi · 4 min · Rigby Highway
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13
Continue on Idaho Medal of Honor Highway
15.4 mi · 16 min · Idaho Medal of Honor Highway
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14
Continue on Yellowstone Highway
17.2 mi · 18 min · Yellowstone Highway
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15
Continue on Idaho Medal of Honor Highway
58 mi · 1 hr 9 min · Idaho Medal of Honor Highway
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16
Turn left
9.1 mi · 12 min
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17
Continue straight
8.6 mi · 13 min
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18
At the end of the road, turn left
40.3 mi · 45 min
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19
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Boise and Ennis.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Vietnam Veterans Memorial Highway
Continue on Vietnam Veterans Memorial Highway
166 mi · 02h 36m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Mostly Sunny leaving Boise and Patchy Smoke then Sunny near Ennis.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boise to Ennis?
The road trip is about 432.1 miles (695.4 km) and usually takes 07h 26m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
American Falls is a useful midpoint, sitting about 215.9 miles from Boise and 216.2 miles from Ennis.
How much longer is the road route than the straight-line distance?
The direct path is about 251 miles (403.9 km), while the road route adds roughly 181.1 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 6:00 AM to 7:30 AM MDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $59.37 one way or $118.74 round trip. Estimated CO2 is about 135.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Boise and Patchy Smoke then Sunny near Ennis.
Flight Path Map
This map shows the direct air route between Boise and Ennis. Straight-line distance: 250.97 mi (403.9 km).
#1 Boise
The capital of Idaho.
| Population | 228,959 |
| Coordinates | 43.6135000, -116.2034500 |
| Altitude | 823 |
| Country | United States |
#2 Ennis
Town in Madison County, Montana, United States
| Population | 1,042 |
| Coordinates | 45.3488200, -111.7297000 |
| Altitude | 1506 |
| Country | United States |
End: Ennis (-111.7297, 45.34882)
Estimated Travel Time
Distance: 695 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 14h 23m |
| 40 mph (64.37 km/h) | 10h 48m |
| 50 mph (80.47 km/h) | 08h 38m |
| 60 mph (96.56 km/h) | 07h 12m |
| 70 mph (112.65 km/h) | 06h 10m |
| 80 mph (129 km/h) | 05h 23m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $59.37 | $118.74 |
| Mid-grade | $4.23 | $64.52 | $129.05 |
| Premium | $4.55 | $69.37 | $138.74 |
| Diesel | $5.41 | $82.53 | $165.07 |
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 Idaho · Aug 24, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.