Marsing, ID to Post Falls, ID is 428.7 miles and takes about 7h 57m via Vietnam Veterans Memorial Highway and US 395/US 95, with a fuel budget near $68 and enough daylight to finish in a day. This trip stays within the Mountain West region, offering a full day's drive through varied Idaho landscapes. The route is considered a mixed drive, suggesting a blend of highway speeds and potentially more local road sections. With a recommended one-day duration, it's a manageable journey for those looking to cover ground efficiently. Plan for about two stops to break up the nearly 8-hour drive.
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
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
214.4 miles from Marsing, ID
A natural place for your longest stop of the day
, about 3h 54m into the drive
.
Main Roads
Road
Distance
Duration
Vietnam Veterans Memorial Highway
190.8 mi
3h 25m
US 395
131.7 mi
2h 23m
US 95
34.1 mi
39m
I 90
25.9 mi
30m
McNary Highway
20.4 mi
21m
Umatilla-Stanfield Highway
8.2 mi
9m
Lewis and Clark Trail
4.9 mi
6m
Lewis and Clark Trail Highway
3.3 mi
4m
Longest stretch:
Vietnam Veterans Memorial Highway
— 190.8 mi, about 3h 25m
Traffic on I-84
Hour-of-day weekday pattern from 33 FHWA count stations on your route.
Peak
2 PM
~526 veh/hr typical
· worst 741
Quietest
2 AM
~63 veh/hr
Peak-to-quiet ratio
8.3×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 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 Marsing, ID and Post Falls, ID.
1
Start on ID 55
1.9 mi·2 min·West Main Street
2
Continue on US 95
19 mi·21 min·US 95
3
Take the exit onto US 95
15 mi·18 min·US 95
4
Take the exit
0.2 mi·27 sec
5
Merge onto I 84
191 mi·3 hr 25 min·Vietnam Veterans Memorial Highway
Use the straight / slight right lanes.
6
Take the exit onto US 395
0.3 mi·41 sec·US 395
Toward US 395 North: Stanfield, Hermiston
7
Continue on US 395
1.2 mi·1 min·Umatilla-Stanfield Highway
8
Continue on US 395
2.0 mi·2 min·South Main Street
9
Continue on US 395
3.2 mi·3 min·Umatilla-Stanfield Highway
10
Turn right onto Southeast 4th Street
1.6 mi·3 min·Southeast 4th Street
11
Turn left onto East Theater Lane
0.3 mi·41 sec·East Theater Lane
12
Turn right onto US 395
0.5 mi·38 sec·North 1st Street
13
Continue on US 395
3.8 mi·4 min·Umatilla-Stanfield Highway
14
Turn left onto US 395; US 730
0.7 mi·48 sec·Columbia River Highway
Use the straight / left lanes.
15
Take the exit onto US 395
0.2 mi·27 sec·US 395
Toward I 82 West, US 395 North: Kennewick, Yakima
16
Merge onto I 82; US 395
20 mi·21 min·McNary Highway
17
Keep slight right at fork onto US 395
3.3 mi·4 min·Lewis and Clark Trail Highway
Toward US 395 north to I‑182: Kennewick, Pasco, Spokane
18
Continue on US 395
1.1 mi·2 min·South US 395
19
Continue on US 395
4.9 mi·6 min·Lewis and Clark Trail
Use the straight / slight right lanes.
20
Take the exit onto US 395
0.2 mi·21 sec·US 395
Toward US 395 north, SR 397 south (Oregon Street): Spokane, FinleyUse the straight / slight right lanes.
21
Keep slight left at fork onto US 395
0.3 mi·34 sec·US 395
Toward US 395
22
Keep slight right at fork onto US 395
131 mi·2 hr 20 min·US 395
Toward US 395 North: SpokaneUse the slight right lane.
23
Merge onto I 90; US 2; US 395
26 mi·30 min·I 90; US 2; US 395
24
Take the exit onto I 90 Business
0.4 mi·48 sec·I 90 Business
Toward I 90 Business
25
Turn left onto I 90 Bus
0.4 mi·1 min·North Spokane Street
26
Turn left onto West 10th Avenue
0.2 mi·38 sec·West 10th Avenue
27
Arrive at destination
West 10th Avenue
Trip Plan
Given the 7-hour 57-minute duration, starting your drive from Marsing, ID early in the morning is advisable to ensure you arrive in Post Falls, ID before dark. You'll have approximately two planned stops to consider, so pace yourself accordingly. Keep an eye on your fuel gauge, especially during the 190.8-mile stretch on Vietnam Veterans Memorial Highway, as services might be less frequent. The estimated fuel cost of $68 should help you budget for the trip. Since this is a one-day route, you have the flexibility to adjust your schedule based on traffic or personal preferences.
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.
You can normally do this drive in one day.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 214.4 miles from Marsing, ID, or about 3h 54m into the drive.
The longest continuous stretch on this route runs about 190.8 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 94 miles or 1h 44m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 214.4 miles or 3h 54m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 6h 48m
Traffic, exits, and arrival timing usually matter more near Post Falls, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Marsing, 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.
Day 1
Settle into the route from Marsing, ID
This is one driving day of about 428.7 miles and 7h 57m.
Your first comfortable stop window is around 94 miles from Marsing, ID.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on Vietnam Veterans Memorial Highway for about 190.8 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 17
5 decision points cluster between mile 240.8 and 271.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
240.8 mi into trip|~4h 25m in|US 395
Take the exit onto US 395 toward I 82 West, US 395 North: Kennewick, Yakima
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward I 82 West, US 395 North: Kennewick, Yaki...
6
261.4 mi into trip|~4h 48m in|US 395 / Lewis and Clark Trail Highway
Keep slight right at fork onto US 395 / Lewis and Clark Trail Highway toward US 395 north to I‑182: Kennewick, Pasco, Spokane
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward US 395 north to I‑182: Kennewick, Pasco,...
7
270.7 mi into trip|~5h 2m in|US 395
Take the exit onto US 395 toward US 395 north, SR 397 south (Oregon Street): Spokane, Finley
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward US 395 north, SR 397 south (Oregon Stree...
6
270.9 mi into trip|~5h 2m in|US 395
Keep slight left at fork onto US 395 toward US 395
Highway fork - watch signs carefully
Toward US 395
7
271.1 mi into trip|~5h 2m in|US 395
Keep slight right at fork onto US 395 toward US 395 North: Spokane
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Toward US 395 North: Spokane
Fuel & Cost
Regular Gas
$66.82 one way
$133.64 round trip
$3.96/gal25.4 MPG avg150 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.17
$70.43
$140.86
premium
$4.47
$75.51
$151.02
diesel
$4.80
$80.95
$161.89
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$67
Meals
$25–$50
Total
$92–$117
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 150 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $45 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
128.6
1
$45.01
$20.58
Efficient EV
107.2
1
$37.51
$17.15
EV Truck/SUV
171.5
2
$60.02
$27.44
Gas CO2
150 kg
EV CO2
50 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 Jul 17, 2026
Origin
Marsing, ID
Late night
in Marsing on Sunday
Local time
2:05 AM
MDT
Current temp
65°F
Mostly Clear
SSE 1 to 9 mph10% chanceLive forecast
Special Weather Statement
Special Weather Statement issued July 16 at 7:15PM MDT by NWS Boise ID
Red Flag Warning
Red Flag Warning issued July 16 at 1:11PM MDT until July 16 at 9:00PM MDT by NWS Boise ID
Destination
Post Falls, ID
Late night
in Post Falls on Sunday
Local time
1:05 AM
PDT
Current temp
100°F
Chance Showers And Thunderstorms
E 3 mph29% chanceLive forecast
Special Weather Statement
Special Weather Statement issued July 16 at 7:15PM MDT by NWS Boise ID
Red Flag Warning
Red Flag Warning issued July 16 at 1:11PM MDT until July 16 at 9:00PM MDT by NWS Boise ID
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
1 hour earlier
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
35 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
7h 57m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
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 drive offers a mix of highway and other road types, with highway driving making up about 45% of the total mileage. You'll experience a significant uninterrupted stretch of 190.8 miles on the Vietnam Veterans Memorial Highway, which will likely be the most engaging part of the journey. As you progress, the road character shifts, moving from the primary highway sections to potentially more varied terrain as you connect to US 395 and US 95. Expect a dynamic driving experience that keeps things interesting throughout the day.
45% highway, the rest on surface roads — varied driving throughout.
27 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 190.8 mi on Vietnam Veterans Memorial Highway.
How Hard Is This Drive?
9/10
This route mixes highway mileage with some local-road sections near the start or finish. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 240.8 miles in near US 395.
Driving Effort9/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 17 significant decision points across 428.7 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 240.8 miles (US 395): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 261.4 miles (US 395 / Lewis and Clark Trail Highway): Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 270.7 miles (US 395): Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Hilly terrain with moderate elevation changes
3,821 ft504 ft
Total Climb
4,434 ft
Total Descent
4,553 ft
Highest Point
3,821 ft
~183.7 mi in
Elevation Range
3,317 ft
Notable High Points
3,544 ft at ~122.5 miles+740 ft prominence
3,821 ft at ~183.7 miles+1,084 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Marsing, ID and Post Falls, ID, road signs point toward Hermiston, Yakima, Pasco, Spokane and Finley.
Doable as a same-day drive at 7h 57m. Total distance: 428.7 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 57m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 190.8 miles on Vietnam Veterans Memorial Highway. The full list of main roads is in the Roads section above.
Yes — we found about 32 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 Post Falls, 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 2 meaningful breaks. There are 32 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 240.8 miles (US 395): Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 261.4 miles (US 395 / Lewis and Clark Trail Highway): Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 270.7 miles (US 395): Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Not recommended in a single day. At 8.0 hours each way, a round trip means 15.9 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Post Falls, ID before the return drive.
