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10h 8m
Distance
510 mi
821 km
Drive Score
9/10
Great drive
Same Day?
2-day trip
Fuel Cost
$81
one way
EV Charging
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station data
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Lewiston, ID
cottonbro studio
Ashton, ID
Shots by Kevin
The drive from Lewiston, ID to Ashton, ID covers 510 miles and takes about 10h 8m 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 $80.82 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
255 miles from Lewiston, ID
A natural place for your longest stop of the day , about 5h 27m into the drive .
At 510 miles and 10h 8m 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.
At 10h 8m, 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.
Moderate - straightforward overall, but long enough or busy enough to require pacing
This drive requires moderate attention. Across 510 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.
These are the spots where you need to pay the most attention. Preview them before you drive.
Turn left onto 7th Avenue
Navigation decision point
At end of road, turn left onto 21st Street
Navigation decision point
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
Keep slight right at fork onto I 15; I 90
Highway fork - watch signs carefully. Lane positioning matters here
Take the exit toward MT 359: Cardwell, Boulder
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
On the drive from Lewiston, ID to Ashton, ID, road signs begin pointing toward Boulder along the way.
Boulder
| 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 |
| Idaho Medal of Honor Highway | 41.7 mi | 50m |
| I 15 | 33.9 mi | 34m |
| MT 359 | 14.6 mi | 17m |
| ID 87 | 9.1 mi | 11m |
| MT 87 | 8.6 mi | 12m |
Step-by-step road directions between Lewiston, ID and Ashton, ID.
Start on this road
Turn right onto Idaho Street
Turn right onto 19th Street
Turn left onto 7th Avenue
At end of road, turn left onto 21st Street
Continue on US 12
Keep slight right at fork onto US 12
Take the exit onto US 12
Continue on US 12
Continue on US 12; US 93
Continue on Brooks Street
Continue on US 12
Turn right onto US 12
Turn left onto Arthur Avenue
Continue on US 12
Take the exit onto US 12
Turn left onto I 90 Bus; US 12
Take the exit onto I 90 Business; US 12
Merge onto I 90; US 12; MT 200
Keep slight right at fork onto I 15; I 90
Take the exit
Turn right onto MT 2
Continue on MT 359
At end of road, turn right onto US 287
At end of road, turn left onto US 287
Turn right onto MT 87
Continue on ID 87
At end of road, turn right onto US 20
Turn left onto ID-47
Arrive at destination
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.
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 112 miles or 2h 33m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 255 miles or 5h 27m 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 255 miles or 5h 27m
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 52m
Traffic, exits, and arrival timing usually matter more near Ashton, ID than in the middle of the route.
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 255 miles and 5.1 hours of wheel time on this day.
Day 2
Finish the approach into Ashton, ID
Aim for roughly 255 miles and 5.1 hours of wheel time on this day.
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 255 mi from Lewiston, ID · 5h 27m into the drive
First major stop
Coffee and fuel
168 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
337 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, MTNight 1
255 mi · about 5.1h in
A practical overnight split lands near Missoula, MT after about 255 miles or 5.1 hours of driving.
Find hotelsA short stop after about 112 miles helps settle the day before fatigue starts building.
The midpoint is around 255 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 255 miles or 5.1 hours on the road.
The final approach into Ashton, 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 Ashton, ID.
On a multi-day trip, keep the last day a little lighter so you reach Ashton, 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.
Regular Gas
$80.82 one way
$161.63 round trip
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.23 | $84.95 | $169.91 |
| premium | $4.53 | $90.94 | $181.87 |
| diesel | $5.64 | $113.30 | $226.61 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$81
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$211–$321
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 178.4 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $54 in charging · 1 stop · 66% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 153 | 1 | $53.55 | $24.48 |
| Efficient EV | 127.5 | 1 | $44.63 | $20.40 |
| EV Truck/SUV | 204 | 2 | $71.40 | $32.64 |
Gas CO2
178 kg
EV CO2
60 kg (66% 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.
Current conditions at both ends of the drive.
Origin
Afternoon in Lewiston on Sunday
Local time
4:44 PM
PDT
Current temp
46°F
Slight Chance Light Rain
Destination
Evening in Ashton on Sunday
Local time
5:44 PM
MDT
Current temp
35°F
Partly Cloudy
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
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
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.
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