Origin
Lewiston, ID
Late night in Lewiston on Saturday
Local time
5:56 AM
PDT
Current temp
64°F
Unavailable
Live forecast
Trip from Lewiston, ID to Fremont County, ID
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
10h 13m
Distance
504.7 mi
812 km
Drive Score
9/10
Great drive
Same Day?
2-day trip
Fuel Cost
$80
one way
EV Charging
Unknown
Best Time to Leave
4 AM
10h 4m
★
6 AM
10h 13m
8 AM
10h 32m
10 AM
10h 20m
12 PM
10h 18m
3 PM
10h 21m
5 PM
10h 31m
8 PM
10h 8m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Lewiston, ID
Wikimedia Commons
Fremont County, ID
David McElwee
Trip Overview
The drive from Lewiston, ID to Fremont County, ID covers 504.7 miles and takes about 10h 13m behind the wheel. It usually feels better as a 2-day road trip than as one long push.
The route leans on US 12, Jeannette Rankin Memorial Highway, US 287 for much of the mileage, and the overall profile is long-distance drive. The longest uninterrupted segment is about 212.4 miles on US 12. At current regular gas prices, budget about $79.98 one way before food or hotel costs.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
252.4 miles from Lewiston, ID
A natural place for your longest stop of the day , about 5h 25m into the drive .
Who Is This Route For?
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
10h 13m drive, plan rest stops for pacing.
Drive Character
At 504.7 miles and 10h 13m of driving, this is a route where fuel stops, weather, and timing matter more than any single turn. The main roads are US 12 and Jeannette Rankin Memorial Highway.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 30 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
US 12 is the longest continuous segment at about 212.4 miles.
How Hard Is This Drive?
At 10h 13m, this is a long-haul route where pacing matters more than any single turn. You will hit about 20 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.7 miles in near 7th Avenue.
Driving Effort
6/10
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 504.7 miles you will encounter 20 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 0.7 miles (7th Avenue): Navigation decision point; at 0.9 miles (21st Street): Navigation decision point; at 1.9 miles (US 12): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Critical Maneuvers
5 of 20 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
5
0.7 mi into trip
|
~2m in
|
7th Avenue
Turn left onto 7th Avenue
Navigation decision point
5
0.9 mi into trip
|
~2m in
|
21st Street
At end of road, turn left onto 21st Street
Navigation decision point
8
1.9 mi into trip
|
~4m in
|
US 12
Keep slight right at fork onto US 12 toward US 95 South: Missoula, Boise
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight lane.
Toward US 95 South: Missoula, Boise
6
332.9 mi into trip
|
~6h 41m in
|
I 15; I 90
Keep slight right at fork onto I 15; I 90
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
5
366.8 mi into trip
|
~7h 16m in
Take the exit toward MT 359: Cardwell, Boulder
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward MT 359: Cardwell, Boulder
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Lewiston, ID to Fremont County, ID, road signs begin pointing toward Boulder along the way.
Boulder
366.8 mi in
|
~7h 16m
Main Roads
| Road | Distance | Duration |
|---|---|---|
| US 12 | 212.4 mi | 4h 42m |
| Jeannette Rankin Memorial Highway | 115.1 mi | 1h 49m |
| US 287 | 68.5 mi | 1h 18m |
| I 15 | 33.9 mi | 34m |
| Idaho Medal of Honor Highway | 32.5 mi | 39m |
| MT 359 | 14.6 mi | 17m |
| ID 87 | 9.1 mi | 11m |
| MT 87 | 8.6 mi | 12m |
Longest stretch:
US 12
— 212.4 mi, about 4h 42m
Turn-by-Turn Driving Directions
Step-by-step road directions between Lewiston, ID and Fremont County, ID.
1
Start on this road
105 ft
·
9 sec
·
this road
2
Turn right onto Idaho Street
0.7 mi
·
1 min
·
Idaho Street
3
Turn right onto 19th Street
288 ft
·
18 sec
·
19th Street
4
Turn left onto 7th Avenue
0.1 mi
·
30 sec
·
7th Avenue
5
At end of road, turn left onto 21st Street
339 ft
·
10 sec
·
21st Street
6
Continue on US 12
1.0 mi
·
2 min
·
US 12
7
Keep slight right at fork onto US 12
7.4 mi
·
8 min
·
US 12
Toward US 95 South: Missoula, Boise
Use the straight lane.
8
Take the exit onto US 12
164 mi
·
3 hr 42 min
·
US 12
Toward US 12 East
9
Continue on US 12
33 mi
·
39 min
·
US 12
10
Continue on US 12; US 93
7.0 mi
·
9 min
·
US 12; US 93
11
Continue on Brooks Street
3.3 mi
·
4 min
·
Brooks Street
Use the straight / right lanes.
12
Continue on US 12
356 ft
·
16 sec
·
South Higgins Avenue
Use the left lane.
13
Turn right onto US 12
0.4 mi
·
36 sec
·
South 6th Street East
14
Turn left onto Arthur Avenue
0.2 mi
·
13 sec
·
Arthur Avenue
15
Continue on US 12
0.2 mi
·
15 sec
·
Madison Street
16
Take the exit onto US 12
0.2 mi
·
26 sec
·
US 12
17
Turn left onto I 90 Bus; US 12
435 ft
·
5 sec
·
Van Buren Street
18
Take the exit onto I 90 Business; US 12
0.2 mi
·
29 sec
·
I 90 Business; US 12
19
Merge onto I 90; US 12; MT 200
115 mi
·
1 hr 49 min
·
Jeannette Rankin Memorial Highway
20
Keep slight right at fork onto I 15; I 90
34 mi
·
34 min
·
I 15; I 90
Use the straight / slight right lanes.
21
Take the exit
0.3 mi
·
38 sec
Toward MT 359: Cardwell, Boulder
22
Turn right onto MT 2
152 ft
·
3 sec
·
MT 2
23
Continue on MT 359
15 mi
·
17 min
·
MT 359
24
At end of road, turn right onto US 287
28 mi
·
33 min
·
US 287
25
At end of road, turn left onto US 287
40 mi
·
45 min
·
US 287
26
Turn right onto MT 87
8.6 mi
·
12 min
·
MT 87
27
Continue on ID 87
9.1 mi
·
11 min
·
ID 87
28
At end of road, turn right onto US 20
33 mi
·
39 min
·
Idaho Medal of Honor Highway
29
Turn right onto South Antelope Flat Road
4.3 mi
·
16 min
·
South Antelope Flat Road
30
Arrive at destination
South Antelope Flat Road
Trip Plan
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
This drive is better paced as a 2-day trip.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 252.4 miles from Lewiston, ID, or about 5h 25m into the drive.
The longest continuous stretch on this route runs about 212.4 miles.
Consider an overnight stop or starting very early.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 111 miles or 2h 31m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 252.4 miles or 5h 25m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Overnight split
Day 1 wrap after about 252.4 miles or 5h 25m
Stop before fatigue turns the last few hours into a grind. You want day two to start fresh, not just resumed.
Final approach
Final hour starts around 8h 46m
Traffic, exits, and arrival timing usually matter more near Fremont County, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Lewiston, 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.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
+
Treat this as a 2-day road trip and book the overnight stop before the busiest arrival window.
Day 1
Settle into the route from Lewiston, ID
Aim for roughly 252 miles and 5.1 hours of wheel time on this day.
Day 2
Finish the approach into Fremont County, ID
Aim for roughly 252 miles and 5.1 hours of wheel time on this day.
Your first comfortable stop window is around 111 miles from Lewiston, ID.
This route usually feels better as a 2-day drive than as one long push.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on US 12 for about 212.4 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 252.4 mi from Lewiston, ID · 5h 25m into the drive
First major stop
Coffee and fuel
167 mi into the route
Best for: Coffee, fuel, and an easy first stretch
This is a natural early stop once the first hours of the drive are behind you.
Second major stop
Overnight candidate
333 mi into the route
Best for: Hotel check-in, dinner, and a fresh start
This lines up well with a realistic day-end stop if you are breaking the drive into stages.
Find hotels in Missoula, MTOvernight Options
Night 1
252 mi · about 5.1h in
A practical overnight split lands near Missoula, MT after about 252 miles or 5.1 hours of driving.
Find hotelsPacing Suggestions
Fuel and coffee
A short stop after about 111 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 252.4 miles from Lewiston, ID, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel checkTop up before US 12 if your tank is already low. That segment runs about 212.4 miles.
Overnight split
Hotel stopFor a steadier pace, wrap day one after about 252 miles or 5.1 hours on the road.
Arriving in Fremont County, ID
The final approach into Fremont County, ID usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Fremont County, ID.
On a multi-day trip, keep the last day a little lighter so you reach Fremont County, ID with some flexibility left in the schedule.
After long uninterrupted mileage, take five minutes before the last urban segment to reset and refocus on exits, merges, and city traffic.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$79.98 one way
$159.95 round trip
$4.03/gal
25.4 MPG avg
177 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.22 | $83.83 | $167.66 |
| premium | $4.53 | $90.03 | $180.06 |
| diesel | $5.61 | $111.43 | $222.86 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$80
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$210–$320
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 176.6 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $53 in charging · 1 stop · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 151.4 | 1 | $52.99 | $24.23 |
| Efficient EV | 126.2 | 1 | $44.16 | $20.19 |
| EV Truck/SUV | 201.9 | 2 | $70.66 | $32.30 |
Gas CO2
177 kg
EV CO2
59 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.
Destination
Fremont County, ID
Morning in Fremont County on Saturday
Local time
6:56 AM
MDT
Current temp
59°F
Unavailable
Live 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.
For long drives, weather on day two can matter just as much as conditions at departure, so check the whole travel window rather than only the first day.
Time zone
1 hour later
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
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
10h 13m on the road
This is long enough that the arrival forecast matters almost as much as departure conditions. Recheck both ends before you roll.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Lewiston, ID to Fremont County, ID covers 504.7 miles and takes about 10h 13m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are US 12, Jeannette Rankin Memorial Highway, US 287. Expect a mix of highway and local road driving.
Consider an overnight stop or starting very early.
Yes. This route is usually more comfortable as a 2-day drive. A sensible stopping point is after roughly 252 miles on day one.
The midpoint is about 252.4 miles from Lewiston, ID. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $79.98 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Start early — leave by 6-7 AM to arrive at a reasonable hour. This is a long drive — plan for a morning departure or consider splitting it into two days.
Plan about 2 meaningful breaks for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This drive requires moderate attention. Across 504.7 miles you will encounter 20 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
The main spots that need attention: at 0.7 miles (7th Avenue): Navigation decision point; at 0.9 miles (21st Street): Navigation decision point; at 1.9 miles (US 12): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
On the drive from Lewiston, ID to Fremont County, ID, road signs begin pointing toward Boulder along the way.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
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