Caldwell, ID to Sugar City, ID is 335.5 miles and takes about 5h 29m via Vietnam Veterans Memorial Highway, I 86, and I 15 BUS, with a fuel budget near $58 and enough daylight to finish in a day. This drive stays within the Mountain West region, offering a straightforward trip across Idaho. It's a single-day route, so you can leave anytime and arrive the same evening. The majority of the trip is on the highway, making for relatively quick travel time. With only one recommended stop and a reasonable duration, it's an accessible option for most drivers.
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
167.8 miles from Caldwell, ID
A natural place for your longest stop of the day
, about 2h 45m into the drive
.
Main Roads
Road
Distance
Duration
Vietnam Veterans Memorial Highway
193.2 mi
3h 6m
I 86
62.7 mi
59m
I 15 BUS
46.3 mi
43m
Idaho Medal of Honor Highway
15.4 mi
16m
Yellowstone Highway
11.9 mi
12m
Rigby Highway
3.1 mi
3m
South 10th Avenue
0.7 mi
1m
West Center Street
0.4 mi
<1m
Longest stretch:
Vietnam Veterans Memorial Highway
— 193.2 mi, about 3h 6m
Traffic on I-84
Hour-of-day weekday pattern from 336 FHWA count stations on your route.
Peak
4 PM
~2,873 veh/hr typical
· worst 3,374
Quietest
2 AM
~190 veh/hr
Peak-to-quiet ratio
15.1×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 104 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 Caldwell, ID and Sugar City, ID.
1
Start on this road
90 ft·11 sec·this road
2
Turn left onto I 84 Business
72 ft·4 sec·Cleveland Boulevard
3
Turn right
141 ft·12 sec
4
Turn right
150 ft·12 sec
5
Turn right onto South 10th Avenue
0.7 mi·1 min·South 10th Avenue
6
Take the ramp
0.5 mi·1 min
7
Merge onto I 84; US 20; US 26; US 30
21 mi·24 min·Vietnam Veterans Memorial Highway
Use the straight / slight right lanes.
8
Keep slight right at fork onto I 84; US 30
172 mi·2 hr 42 min·Vietnam Veterans Memorial Highway
Use the slight right lane.
9
Continue on I 86; US 30
63 mi·59 min·I 86; US 30
10
Keep slight left at fork
0.6 mi·40 sec
Toward Idaho Falls
11
Merge onto I 15 BUS
46 mi·43 min·I 15 BUS
12
Take the exit onto US 20
0.3 mi·35 sec·US 20
Exit 119Toward US 20 East, I 15: Rigby, West Yellowstone
13
Continue on US 20
3.1 mi·3 min·Rigby Highway
Use the right lane.
14
Continue on US 20
15 mi·16 min·Idaho Medal of Honor Highway
15
Continue on US 20
12 mi·12 min·Yellowstone Highway
16
Take the exit
0.3 mi·36 sec
Toward Sugar City, Salem
17
Turn right onto West Center Street
0.4 mi·52 sec·West Center Street
18
Turn left onto North Austin Avenue
51 ft·2 sec·North Austin Avenue
19
Arrive at destination
North Austin Avenue
Trip Plan
This 5h 29m drive is easily manageable in a single day, so you have flexibility in your departure time. Plan for one stop along the way to break up the 335.5 miles, perhaps around the halfway point. Keep an eye on your fuel gauge, especially as you transition off the main highways, as services might become less frequent. The fuel cost is estimated at $58, so budget accordingly. Since you'll be covering 193.2 miles on the Vietnam Veterans Memorial Highway, ensure you're comfortable with extended periods of highway driving.
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 167.8 miles from Caldwell, ID, or about 2h 45m into the drive.
The longest continuous stretch on this route runs about 193.2 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 74 miles or 1h 16m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 167.8 miles or 2h 45m 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 27m
Traffic, exits, and arrival timing usually matter more near Sugar City, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Caldwell, 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 Caldwell, ID
This is one driving day of about 335.5 miles and 5h 29m.
Your first comfortable stop window is around 74 miles from Caldwell, 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 Vietnam Veterans Memorial Highway for about 193.2 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 0.1 and 304.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.1 mi into trip|~0m in
Turn right
Navigation decision point
5
1.3 mi into trip|~3m in|I 84; US 20; US 26; US 30 / Vietnam Veterans Memorial Highway
Merge onto I 84; US 20; US 26; US 30 / Vietnam Veterans Memorial Highway
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
6
22.2 mi into trip|~27m in|I 84; US 30 / Vietnam Veterans Memorial Highway
Keep slight right at fork onto I 84; US 30 / Vietnam Veterans Memorial Highway
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
5
257.2 mi into trip|~4h 9m in
Keep slight left at fork toward Idaho Falls
Highway fork - watch signs carefully
Toward Idaho Falls
6
304.1 mi into trip|~4h 54m in|US 20
Take the exit onto US 20 toward US 20 East, I 15: Rigby, West Yellowstone
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 119
Toward US 20 East, I 15: Rigby, West Yellowston...
Fuel & Cost
Regular Gas
$60.43 one way
$120.86 round trip
$4.58/gal25.4 MPG avg117 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.78
$63.11
$126.22
premium
$5.11
$67.44
$134.89
diesel
$6.18
$81.62
$163.23
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$60
Meals
$25–$50
Total
$85–$110
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 117.4 kg one way.
Prices: EIA weekly data, 2026-10-12.
Driving Electric?
About $35 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
100.7
1
$35.23
$16.10
Efficient EV
83.9
0
$29.36
$13.42
EV Truck/SUV
134.2
1
$46.97
$21.47
Gas CO2
117 kg
EV CO2
39 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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 Oct 18, 2026
Origin
Caldwell, ID
Late night
in Caldwell on Monday
Local time
4:27 AM
MDT
Current temp
37°F
Mostly Cloudy
W 3 mph0% chanceLive forecast
Destination
Sugar City, ID
Late night
in Sugar City on Monday
Local time
4:27 AM
MDT
Current temp
32°F
Mostly Clear
ENE 3 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
5 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 29m 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.
National Parks Near This Route
Worth a detour if your schedule allows.
Hagerman Fossil Beds National Monument
National Monument
During the Pliocene, this place looked quite different. Lush wetlands, forests, and grasslands provided excellent habitat for a variety of animals. From fascinating, now-extinct creatures like the sab...
8 mi from route
~20 min detour
Free
near mile 115.7
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
You'll spend about 33% of this 335.5-mile drive on highways. The longest stretch without a significant change in road type is 193.2 miles, primarily on the Vietnam Veterans Memorial Highway. Expect to transition from highway cruising to surface roads as you approach your destination. The mix of highway and surface roads means you'll experience both faster travel and potentially more local traffic as you get closer to Sugar City.
33% highway, the rest on surface roads — varied driving throughout.
19 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 193.2 mi on Vietnam Veterans Memorial Highway.
How Hard Is This Drive?
6/10
This route mixes highway mileage with some local-road sections near the start or finish. You will hit about 12 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.1 miles in.
Driving Effort6/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 335.5 miles you will encounter 12 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 0.1 miles: Navigation decision point; at 1.3 miles (I 84; US 20; US 26; US 30 / Vietnam Veterans Memorial Highway): Merge point - match speed before joining. Lane positioning matters here; at 22.2 miles (I 84; US 30 / Vietnam Veterans Memorial Highway): Highway fork - watch signs carefully. Lane positioning matters here.
Elevation Profile
Hilly terrain with moderate elevation changes
4,896 ft2,374 ft
Total Climb
3,212 ft
Total Descent
691 ft
Highest Point
4,896 ft
~335.5 mi in
Elevation Range
2,521 ft
Notable High Points
4,270 ft at ~191.7 miles+59 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Caldwell, ID and Sugar City, ID, road signs point toward Idaho Falls and Yellowstone.
Doable as a same-day drive at 5h 29m. Total distance: 335.5 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 29m drive, comfortable solo distance.
Scenic Drive
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 193.2 miles on Vietnam Veterans Memorial Highway. The full list of main roads is in the Roads section above.
Yes — we found about 21 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.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Sugar City, ID before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 21 rest areas along the route for bathroom stops.
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: at 0.1 miles: Navigation decision point; at 1.3 miles (I 84; US 20; US 26; US 30 / Vietnam Veterans Memorial Highway): Merge point - match speed before joining. Lane positioning matters here; at 22.2 miles (I 84; US 30 / Vietnam Veterans Memorial Highway): Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Hagerman Fossil Beds National Monument. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.5 hours each way, a round trip means 11.0 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Sugar City, ID before the return drive.
