Challis to Caldwell is 203.3 miles and takes about 4h 57m via Salmon River Scenic Byway, Banks Lowman Road, and Ponderosa Pine Scenic Route, with a fuel budget near $36 and enough daylight to finish in a day. This drive stays within Idaho, traveling from the Mountain West region to the Mountain West region. You'll experience mostly surface roads for this trip, so expect a more relaxed pace. It's a straightforward one-day drive that offers a good look at the Idaho landscape.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
101.6 miles from Challis, ID
A natural place for your longest stop of the day
, about 2h 22m into the drive
.
Main Roads
Road
Distance
Duration
Salmon River Scenic Byway
54.9 mi
1h 21m
Banks Lowman Road
33.3 mi
58m
Ponderosa Pine Scenic Route
32.8 mi
44m
State Highway 21
24.4 mi
28m
Highway 55
15 mi
20m
North Horseshoe Bend Road
8.8 mi
11m
East State Street
7.2 mi
10m
Idaho Medal of Honor Highway
7 mi
9m
Longest stretch:
Salmon River Scenic Byway
— 54.9 mi, about 1h 21m
Traffic on I-84
Hour-of-day weekday pattern from 10 FHWA count stations on your route.
Peak
4 PM
~2,493 veh/hr typical
· worst 2,917
Quietest
2 AM
~140 veh/hr
Peak-to-quiet ratio
17.8×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 47 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Challis, ID and Caldwell, ID.
1
Start on this road
135 ft·11 sec·this road
2
Turn right onto South 7th Street
326 ft·16 sec·South 7th Street
3
Turn right onto Main Street
0.4 mi·1 min·Main Street
4
Turn right onto US 93
2.3 mi·3 min·South Salmon River Scenic Byway
5
Continue on ID 75
55 mi·1 hr 21 min·Salmon River Scenic Byway
6
Turn right onto ID 21
1.0 mi·2 min·Eva Falls Avenue
7
Continue on ID 21
24 mi·28 min·State Highway 21
8
Continue on ID 21
33 mi·44 min·Ponderosa Pine Scenic Route
9
Turn right onto Banks Lowman Road
33 mi·58 min·Banks Lowman Road
10
Turn left onto ID 55
357 ft·5 sec·Horseshoe Bend Road
11
Continue on ID 55
13 mi·17 min·Highway 55
12
Continue on ID 55
1.3 mi·1 min·Horseshoe Bend Road
13
Continue on ID 55
2.0 mi·5 min·ID 55
14
Continue on ID 55
0.4 mi·29 sec·Horseshoe Bend Road
15
Continue on ID 55
2.4 mi·3 min·Highway 55
16
Continue on ID 55
5.9 mi·7 min·Payette River Scenic Byway
17
Continue on ID 55
8.8 mi·11 min·North Horseshoe Bend Road
18
Turn right onto ID 44; ID 55
7.2 mi·10 min·East State Street
19
Turn left onto ID 16
2.1 mi·2 min·Central Valley Expressway
20
Turn right onto US 20; US 26
2.0 mi·2 min·West Chinden Boulevard
21
Continue on US 20; US 26
7.0 mi·9 min·Idaho Medal of Honor Highway
22
Continue on US 20; US 26
0.7 mi·1 min·Franklin Road
23
Continue on North 21st Avenue
0.6 mi·1 min·North 21st Avenue
24
Turn right onto I 84 Business
0.8 mi·1 min·Blaine Street
25
Turn left onto South 10th Avenue
166 ft·9 sec·South 10th Avenue
26
Turn left
68 ft·6 sec
27
Turn right
79 ft·5 sec
28
Arrive at destination
Trip Plan
Given the 4 hour 57 minute estimated drive time, starting your trip in the morning is advisable to allow for any unplanned stops or to simply enjoy the scenery. With only one recommended stop and a fuel cost around $36, this is a manageable one-day drive. Keep an eye on your fuel gauge, especially when you're on the longer stretches of the Salmon River Scenic Byway, as services might be less frequent. The predominantly surface road profile means you can be flexible with your departure time, but aim to arrive before dusk.
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 101.6 miles from Challis, ID, or about 2h 22m into the drive.
The longest continuous stretch on this route runs about 54.9 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 45 miles or 1h 7m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 101.6 miles or 2h 22m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 6m
Traffic, exits, and arrival timing usually matter more near Caldwell, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Challis, 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 Challis, ID
This is one driving day of about 203.3 miles and 4h 57m.
Your first comfortable stop window is around 45 miles from Challis, 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 Salmon River Scenic Byway for about 54.9 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 12
5 decision points cluster between mile 0 and 203.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
0 mi into trip|~0m in|South 7th Street
Turn right onto South 7th Street
Navigation decision point
4
0.1 mi into trip|~0m in|Main Street
Turn right onto Main Street
Navigation decision point
4
0.5 mi into trip|~1m in|US 93 / South Salmon River Scenic Byway
Turn right onto US 93 / South Salmon River Scenic Byway
Navigation decision point
4
149.2 mi into trip|~3h 40m in|ID 55 / Horseshoe Bend Road
Turn left onto ID 55 / Horseshoe Bend Road
Navigation decision point
5
203.3 mi into trip|~4h 57m in
Turn left
Navigation decision point
Fuel & Cost
Regular Gas
$31.69 one way
$63.38 round trip
$3.96/gal25.4 MPG avg71 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$33.40
$66.80
premium
$4.47
$35.81
$71.62
diesel
$4.80
$38.39
$76.77
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$32
Meals
$25–$50
Total
$57–$82
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 71.1 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $21 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
61
0
$21.35
$9.76
Efficient EV
50.8
0
$17.79
$8.13
EV Truck/SUV
81.3
1
$28.46
$13.01
Gas CO2
71 kg
EV CO2
24 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 Jul 19, 2026
Origin
Challis, ID
Late night
in Challis on Sunday
Local time
5:12 AM
MDT
Current temp
58°F
Mostly Clear
WSW 1 to 5 mph6% chanceLive forecast
Destination
Caldwell, ID
Late night
in Caldwell on Sunday
Local time
5:12 AM
MDT
Current temp
63°F
Areas Of Smoke
WNW 2 to 8 mph1% chanceLive forecast
88°F
Cascade, ID
102 mi in
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
5 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
4h 57m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
This route covers 203.3 miles, with 21% on highways. You'll encounter the longest stretch of 54.9 miles on the Salmon River Scenic Byway before transitioning to surface roads. Expect a change from highway speeds to a more rural cruising feel as you move onto sections like Banks Lowman Road and the Ponderosa Pine Scenic Route. The profile is mostly surface roads, indicating a less intense driving experience than a full interstate trip.
Only 21% highway — the rest is turn-by-turn surface driving.
28 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 54.9 mi on Salmon River Scenic Byway.
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 South 7th Street.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 4h 57m drive. You will face about 12 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 (South 7th Street): Navigation decision point; at 0.1 miles (Main Street): Navigation decision point; at 0.5 miles (US 93 / South Salmon River Scenic Byway): Navigation decision point.
The longest stretch is about 54.9 miles on Salmon River Scenic Byway. The full list of main roads is in the Roads section above.
Yes — we found about 3 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
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 (South 7th Street): Navigation decision point; at 0.1 miles (Main Street): Navigation decision point; at 0.5 miles (US 93 / South Salmon River Scenic Byway): Navigation decision point.
Possible but tiring. At 5.0 hours each way, an in-and-out day trip would put you behind the wheel for 9.9 hours — manageable with a long break at Caldwell, ID, but most travelers stay overnight.
