Traveling from Ketchum to Boise covers 152.9 miles across the Mountain West, a journey that typically takes about 3 hours and 1 minute. You can easily complete this drive in a single day, making it an ideal choice for a straightforward road trip. Budgeting approximately $24 for fuel should keep you covered for the entire trek. Since you will be navigating via the Idaho Medal of Honor Highway, Sun Valley Highway, and the Vietnam Veterans Memorial Highway, expect a transition from high-country mountain settings to the Boise metropolitan area. Because the route is relatively short, you won't need to worry about booking an overnight stay unless you prefer to linger along the way. Overall, this trip offers a manageable and efficient path between these two Idaho hubs.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
76.5 miles from Ketchum, ID
A natural place for your longest stop of the day
, about 1h 37m into the drive
.
Main Roads
Road
Distance
Duration
Idaho Medal of Honor Highway
42.3 mi
49m
Sun Valley Highway
40.8 mi
47m
Vietnam Veterans Memorial Highway
40.1 mi
37m
North Main Street
26.2 mi
39m
South Broadway Avenue
2.9 mi
5m
East Front Street
0.6 mi
1m
East Sun Valley Road
<0.1 mi
<1m
Longest stretch:
Idaho Medal of Honor Highway
— 42.3 mi, about 49m
Turn-by-Turn Driving Directions
Step-by-step road directions between Ketchum, ID and Boise, ID.
1
Start on this road
87 ft·11 sec·this road
2
Turn left onto ID 75 Spur
154 ft·11 sec·East Sun Valley Road
3
Turn left onto ID 75
26 mi·39 min·North Main Street
4
Turn right onto US 20
42 mi·48 min·Idaho Medal of Honor Highway
5
Continue on US 20
41 mi·47 min·Sun Valley Highway
6
Take the ramp onto US 20
0.2 mi·31 sec·Idaho Medal of Honor Highway
Toward I 84 West, US 20 West, US 26 West, US 30 West: Boise
7
Merge onto I 84; US 20; US 26; US 30
40 mi·37 min·Vietnam Veterans Memorial Highway
8
Take the exit onto US 20; US 26
0.3 mi·34 sec·Idaho Medal of Honor Highway
Exit 54Toward US 20, US 26: Broadway Avenue
9
Keep slight right at fork onto US 20; US 26
438 ft·12 sec·Idaho Medal of Honor Highway
Toward US 20, US 26: Boise State University, City Center:Convention CenterUse the slight right lane.
10
Turn right onto US 20; US 26
2.9 mi·5 min·South Broadway Avenue
Use the straight / left / right lanes.
11
Turn left onto US 20; US 26
0.6 mi·1 min·East Front Street
12
Turn right
55 ft·4 sec
13
Arrive at destination
Trip Plan
Planning for this 3-hour journey is simple, though you should factor in at least one planned stop to break up the drive comfortably. Since you are navigating local roads, try to depart during daylight hours to ensure you have maximum visibility for the many turns ahead. Keep your $24 fuel budget in mind by checking your levels before you depart Ketchum, as service intervals may fluctuate on these local highways. Flexibility is your biggest advantage here, allowing you to adjust your schedule based on traffic or your own pace. A smart tip for this specific route is to treat the 42.3-mile stretch on the Idaho Medal of Honor Highway as your primary opportunity to settle into a steady driving flow before the route’s character changes again.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 76.5 miles from Ketchum, ID, or about 1h 37m into the drive.
The longest continuous stretch on this route runs about 42.3 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 34 miles or 48m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 76.5 miles or 1h 37m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 30m
Traffic, exits, and arrival timing usually matter more near Boise, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Ketchum, ID so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Ketchum, ID
This is one driving day of about 152.9 miles and 3h 1m.
Your first comfortable stop window is around 34 miles from Ketchum, ID.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Idaho Medal of Honor Highway for about 42.3 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 10
5 decision points cluster between mile 0 and 149.4 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0 mi into trip|~0m in|ID 75 Spur / East Sun Valley Road
Turn left onto ID 75 Spur / East Sun Valley Road
Navigation decision point
6
108.7 mi into trip|~2h 14m in|US 20 / Idaho Medal of Honor Highway
Take the ramp onto US 20 / Idaho Medal of Honor Highway toward I 84 West, US 20 West, US 26 West, US 30 West: Boise
Multiple destination signs - pick the right one
Toward I 84 West, US 20 West, US 26 West, US 30...
6
149.1 mi into trip|~2h 52m in|US 20; US 26 / Idaho Medal of Honor Highway
Take the exit onto US 20; US 26 / Idaho Medal of Honor Highway toward US 20, US 26: Broadway Avenue
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 54
Toward US 20, US 26: Broadway Avenue
9
149.3 mi into trip|~2h 53m in|US 20; US 26 / Idaho Medal of Honor Highway
Keep slight right at fork onto US 20; US 26 / Idaho Medal of Honor Highway toward US 20, US 26: Boise State University, City Center:Convention Center
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward US 20, US 26: Boise State University, Ci...
5
149.4 mi into trip|~2h 53m in|US 20; US 26 / South Broadway Avenue
Turn right onto US 20; US 26 / South Broadway Avenue
Lane positioning matters here
Use the straight / left / right lanes.
Fuel & Cost
Regular Gas
$24.23 one way
$48.46 round trip
$4.03/gal25.4 MPG avg54 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.22
$25.40
$50.79
premium
$4.53
$27.28
$54.55
diesel
$5.61
$33.76
$67.52
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$24
Meals
$25–$50
Total
$49–$74
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 53.5 kg one way.
Prices: EIA weekly data, 2026-04-13.
Station data from NREL Alternative Fuel Stations database.
Driving Electric?
About $16 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
45.9
0
$16.05
$7.34
Efficient EV
38.2
0
$13.38
$6.12
EV Truck/SUV
61.2
0
$21.41
$9.79
Gas CO2
53 kg
EV CO2
18 kg (66% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Apr 21, 2026
Origin
Ketchum, ID
Late night
in Ketchum on Tuesday
Local time
2:57 AM
MDT
Current temp
39°F
Partly Cloudy
ENE 6 mph0% chanceLive forecast
Destination
Boise, ID
Late night
in Boise on Tuesday
Local time
2:57 AM
MDT
Current temp
49°F
Partly Cloudy
E 7 mph0% chanceLive forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
10 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
3h 1m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
Expect a turn-heavy local driving experience rather than a high-speed interstate cruise, as this route features 0% highway share. The road requires your full attention, offering a more hands-on feel behind the wheel than a standard freeway trek. You will encounter a longest uninterrupted stretch of 42.3 miles along the Idaho Medal of Honor Highway, which provides a bit of rhythm before the route shifts character again. Because this is not a monotonous interstate grind, you should prepare for a varied pace that demands engagement with local road conditions. This drive is best suited for those who prefer navigating scenic, winding paths over the predictable nature of major expressways.
Only 0% highway — the rest is turn-by-turn surface driving.
13 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 42.3 mi on Idaho Medal of Honor Highway.
How Hard Is This Drive?
3/10
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near ID 75 Spur / East Sun Valley Road.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 3h 1m drive. You will face about 10 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: near the start (ID 75 Spur / East Sun Valley Road): Navigation decision point; at 108.7 miles (US 20 / Idaho Medal of Honor Highway): Multiple destination signs - pick the right one; at 149.1 miles (US 20; US 26 / Idaho Medal of Honor Highway): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Boise is the capital and largest city of Idaho. Boise offers numerous recreational opportunities, including extensive hiking and biking in the foothills to the immediate north of downtown. Boise is a regional hub for jazz, theater, and indie music, and is home to several museums.
Top landmarks
•Idaho State Capitol — Idaho state capitol building in Boise, Idaho, U.S.A.
•Cathedral of St. John the Evangelist — church in Idaho, United States
•Morris Hill Cemetery Mausoleum — mausoleum in Morris Hill Cemetery, Boise, Idaho
Mostly surface roads route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 42.3 miles on Idaho Medal of Honor Highway. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
Yes, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
Mostly yes along the main roads, but rural stretches through ID can have sparse or no coverage. Before you leave, download offline Google Maps or Apple Maps for the route, and consider downloading music or podcasts instead of streaming. If you depend on data for navigation, keep a paper backup of the turn-by-turn directions.
The main spots that need attention: near the start (ID 75 Spur / East Sun Valley Road): Navigation decision point; at 108.7 miles (US 20 / Idaho Medal of Honor Highway): Multiple destination signs - pick the right one; at 149.1 miles (US 20; US 26 / Idaho Medal of Honor Highway): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Possible but tiring. At 3.0 hours each way, an in-and-out day trip would put you behind the wheel for 6.0 hours — manageable with a long break at Boise, ID, but most travelers stay overnight.
