How far is Fremont County, ID from Boise, ID?
The driving distance from Fremont County, ID to Boise, ID is about 348 miles (560 km), with a travel time of about 06h 33m by car.
- The straight-line flight distance is about 238.7 miles (384.2 km).
- For a round trip, plan for roughly 13h 07m 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 06h 33m.
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 Cassia County, Idaho, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Fremont County and Boise.
Turn-by-Turn Driving Directions
Step-by-step road directions between Fremont County and Boise.
-
1
Start on South Antelope Flat Road
4.3 mi · 17 min · South Antelope Flat Road
-
2
At the end of the road, turn right onto Idaho Medal of Honor Highway
25.5 mi · 29 min · Idaho Medal of Honor Highway
-
3
Continue on Yellowstone Highway
17.2 mi · 18 min · Yellowstone Highway
-
4
Continue on Idaho Medal of Honor Highway
15.4 mi · 16 min · Idaho Medal of Honor Highway
-
5
Continue on Rigby Highway
3.1 mi · 4 min · Rigby Highway
-
6
Merge slight right onto Grandview Drive
575 ft · 14 sec · Grandview Drive
-
7
Take the exit slight right toward I 15 South: Arco, Pocatello
1466 ft · 37 sec
-
8
Merge slight left onto Veterans Memorial Highway
46.5 mi · 44 min · Veterans Memorial Highway
-
9
Take the exit slight right toward I 86 West: Chubbuck, Twin Falls
1 km · 44 sec
-
10
Continue straight
62.7 mi · 59 min
-
11
Continue on Vietnam Veterans Memorial Highway
166.5 mi · 2 hr 36 min · Vietnam Veterans Memorial Highway
-
12
Take the exit slight right toward US 20, US 26: Broadway Avenue
1402 ft · 34 sec · Idaho Medal of Honor Highway
-
13
Keep slight right to continue on Idaho Medal of Honor Highway
134 m · 13 sec · Idaho Medal of Honor Highway
-
14
Turn right onto South Broadway Avenue
2.9 mi · 6 min · South Broadway Avenue
-
15
Turn left onto East Front Street
1 km · 2 min · East Front Street
-
16
Turn right
17 m · 4 sec
-
17
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Fremont County and Boise.
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 leaving Fremont County and Mostly Sunny near Boise.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Fremont County to Boise?
The road trip is about 348 miles (560 km) and usually takes 06h 33m 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?
Declo is a useful midpoint, sitting about 172.8 miles from Fremont County and 175.2 miles from Boise.
How much longer is the road route than the straight-line distance?
The direct path is about 238.7 miles (384.2 km), while the road route adds roughly 109.3 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 $47.81 one way or $95.61 round trip. Estimated CO2 is about 109.1 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Fremont County and Mostly Sunny near Boise.
Stop Ideas Near Declo
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 Declo.
Twin Falls, Idaho
Flight Path Map
This map shows the direct air route between Fremont County and Boise. Straight-line distance: 238.76 mi (384.24 km).
#1 Fremont County
County in Idaho, United States
| Population | 13,099 |
| Coordinates | 44.2287900, -111.4820200 |
| Altitude | 1892 |
| Country | United States |
#2 Boise
The capital of Idaho.
| Population | 228,959 |
| Coordinates | 43.6135000, -116.2034500 |
| Altitude | 823 |
| Country | United States |
End: (-116.203299, 43.613424)
Estimated Travel Time
Distance: 560 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 35m |
| 40 mph (64.37 km/h) | 08h 41m |
| 50 mph (80.47 km/h) | 06h 57m |
| 60 mph (96.56 km/h) | 05h 47m |
| 70 mph (112.65 km/h) | 04h 58m |
| 80 mph (129 km/h) | 04h 20m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $47.81 | $95.61 |
| Mid-grade | $4.23 | $51.96 | $103.91 |
| Premium | $4.55 | $55.86 | $111.72 |
| Diesel | $5.41 | $66.46 | $132.92 |
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 · Apr 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.