How far is Boise, ID from Townsend, MT?
The driving distance from Boise, ID to Townsend, MT is about 508.5 miles (818.4 km), with a travel time of about 08h 52m by car.
- The straight-line flight distance is about 295.5 miles (475.5 km).
- For a round trip, plan for roughly 17h 44m 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 08h 52m.
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 Bingham County, Idaho, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny then Patchy Smoke
Areas Of Smoke then Sunny
Driving Route Map
The map below follows the saved road route between Boise and Townsend.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boise and Townsend.
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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
Turn straight
137 m · 15 sec
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20
Continue straight
76.3 mi · 1 hr 25 min
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21
Turn right
34 m · 8 sec
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22
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Boise and Townsend.
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.
Sunny then Patchy Smoke leaving Boise and Areas Of Smoke then Sunny near Townsend.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boise to Townsend?
The road trip is about 508.5 miles (818.4 km) and usually takes 08h 52m 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?
Blackfoot is a useful midpoint, sitting about 254.1 miles from Boise and 254.5 miles from Townsend.
How much longer is the road route than the straight-line distance?
The direct path is about 295.5 miles (475.5 km), while the road route adds roughly 213 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 $69.88 one way or $139.76 round trip. Estimated CO2 is about 159.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny then Patchy Smoke around Boise and Areas Of Smoke then Sunny near Townsend.
Flight Path Map
This map shows the direct air route between Boise and Townsend. Straight-line distance: 295.46 mi (475.49 km).
#1 Boise
The capital of Idaho.
| Population | 228,959 |
| Coordinates | 43.6135000, -116.2034500 |
| Altitude | 823 |
| Country | United States |
#2 Townsend
City in Montana, USA
| Population | 2,220 |
| Coordinates | 46.3191000, -111.5208000 |
| Altitude | 1171 |
| Country | United States |
End: Townsend (-111.5208, 46.3191)
Estimated Travel Time
Distance: 818 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 16h 56m |
| 40 mph (64.37 km/h) | 12h 42m |
| 50 mph (80.47 km/h) | 10h 10m |
| 60 mph (96.56 km/h) | 08h 28m |
| 70 mph (112.65 km/h) | 07h 15m |
| 80 mph (129 km/h) | 06h 20m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $69.88 | $139.76 |
| Mid-grade | $4.23 | $75.95 | $151.89 |
| Premium | $4.55 | $81.65 | $163.31 |
| Diesel | $5.41 | $97.15 | $194.29 |
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 11, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.