Grand Coulee, WA to Tacoma, WA is 241.4 miles and takes about 4h 56m via I 90 and State Route 18, with a fuel budget near $51 and enough daylight to finish in a day. This drive primarily takes you across Washington state, moving from the drier inland areas toward the more populated Puget Sound region. With 68% of the route on highways, expect a good portion of your travel to be on faster-paced roads. It's a straightforward, single-day trip that gets you from one side of the state to the other efficiently.
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
120.7 miles from Grand Coulee, WA
A natural place for your longest stop of the day
, about 2h 34m into the drive
.
Main Roads
Road
Distance
Duration
I 90
125.7 mi
2h 17m
State Route 18
26.7 mi
34m
Coulee Boulevard
25.1 mi
32m
Coulee Corridor
21.3 mi
29m
Basin Street Southwest
19.9 mi
26m
I 5
7.2 mi
9m
Coulee Corridor / Sunset Highway
4.3 mi
6m
WA 28
3.7 mi
5m
Longest stretch:
I 90
— 125.7 mi, about 2h 17m
Traffic on I-90
Hour-of-day weekday pattern from 35 FHWA count stations on your route.
Peak
1 PM
~1,207 veh/hr typical
· worst 2,108
Quietest
2 AM
~99 veh/hr
Peak-to-quiet ratio
12.2×
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 Grand Coulee, WA and Tacoma, WA.
1
Start on Spokane Way
142 ft·5 sec·Spokane Way
2
Turn right onto Main Street
163 ft·5 sec·Main Street
3
Turn left onto WA 155
0.3 mi·44 sec·Midway Avenue
4
Continue on WA 155
257 ft·7 sec·Midway Avenue
5
Continue on WA 155
0.5 mi·56 sec·Grand Coulee Avenue
6
Continue on WA 155
25 mi·32 min·Coulee Boulevard
7
Continue on US 2
4.3 mi·6 min·Coulee Corridor / Sunset Highway
8
Turn left onto WA 17
21 mi·29 min·Coulee Corridor
9
Turn right onto WA 28
3.7 mi·5 min·WA 28
10
Turn left onto Alder Street Northwest
1.6 mi·2 min·Alder Street Northwest
11
Continue on Alder Street Southwest
0.4 mi·56 sec·Alder Street Southwest
12
Turn right onto 5th Avenue Southwest
392 ft·16 sec·5th Avenue Southwest
13
Turn left onto WA 28
20 mi·26 min·Basin Street Southwest
14
Take the ramp
0.3 mi·44 sec
Toward I 90 West: Seattle
15
Merge onto I 90
126 mi·2 hr 17 min·I 90
Use the straight / slight right lanes.
16
Take the exit
0.2 mi·30 sec
Exit 25Toward WA 18 West: AuburnUse the slight right lane.
17
Keep slight left at fork
448 ft·13 sec
Toward SR 18 west, Snoqualmie Parkway: Auburn, TacomaUse the straight / left / right lanes.
18
Merge onto WA 18
0.3 mi·25 sec·Snoqualmie Parkway
19
Continue on WA 18
27 mi·34 min·State Route 18
Use the straight / slight right lanes.
20
Take the exit
0.6 mi·1 min
Toward I 5: Seattle, TacomaUse the straight / slight right lanes.
21
Keep slight left at fork
0.6 mi·1 min
Toward I 5 South, WA 161: Enchanted Parkway South, TacomaUse the straight lane.
22
Keep slight left at fork
0.2 mi·31 sec
Toward I 5 South: Tacoma
23
Merge onto I 5
7.2 mi·9 min·I 5
Use the straight / slight right lanes.
24
Take the exit
0.1 mi·19 sec
Exit 133Toward WA 7 South, I 705 North: City Center, Tacoma Dome
25
Keep slight right at fork
334 ft·8 sec
Toward I 705 North: City Center, Tacoma Dome Station
26
Keep slight left at fork
0.4 mi·50 sec
Toward I 705 North: City CenterUse the straight / slight right lanes.
27
Merge onto I 705
0.3 mi·22 sec·I 705
Use the straight / slight right lanes.
28
Take the exit
0.3 mi·37 sec
Toward A Street, City CenterUse the slight left lane.
29
Keep slight left at fork
0.2 mi·31 sec
Toward South 15 Street, Pacific AvenueUse the slight left / straight lanes.
30
Continue on South 15th Street
0.3 mi·59 sec·South 15th Street
Use the straight / left / right lanes.
31
Turn right onto Tacoma Avenue South
0.3 mi·49 sec·Tacoma Avenue South
32
Turn right onto South 11th Street
43 ft·1 sec·South 11th Street
33
Arrive at destination
South 11th Street
Trip Plan
Since this trip is under 5 hours and can be completed in a single day, you have a lot of flexibility. Leaving Grand Coulee in the morning will allow you to arrive in Tacoma with plenty of daylight. The longest stretch without a significant change in road type is 125.7 miles on I 90, so plan your fuel stops accordingly before you hit that segment. Keep an eye on your fuel gauge, especially since the estimated fuel cost is around $51, and it's always better to top off when you see a good opportunity rather than when you're running low.
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 120.7 miles from Grand Coulee, WA, or about 2h 34m into the drive.
The longest continuous stretch on this route runs about 125.7 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 53 miles or 1h 11m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 120.7 miles or 2h 34m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 58m
Traffic, exits, and arrival timing usually matter more near Tacoma, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Grand Coulee, WA 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 Grand Coulee, WA
This is one driving day of about 241.4 miles and 4h 56m.
Your first comfortable stop window is around 53 miles from Grand Coulee, WA.
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 I 90 for about 125.7 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 25
5 decision points cluster between mile 203.5 and 240.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
203.5 mi into trip|~4h 4m in
Take the exit toward WA 18 West: Auburn
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 25
Toward WA 18 West: Auburn
9
203.7 mi into trip|~4h 4m in
Keep slight left at fork toward SR 18 west, Snoqualmie Parkway: Auburn, Tacoma
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / left / right lanes.
Toward SR 18 west, Snoqualmie Parkway: Auburn,...
8
231.4 mi into trip|~4h 40m in
Keep slight left at fork toward I 5 South, WA 161: Enchanted Parkway South, Tacoma
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight lane.
Toward I 5 South, WA 161: Enchanted Parkway Sou...
8
240.4 mi into trip|~4h 53m in
Take the exit toward A Street, City Center
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Toward A Street, City Center
9
240.7 mi into trip|~4h 54m in
Keep slight left at fork toward South 15 Street, Pacific Avenue
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / straight lanes.
Toward South 15 Street, Pacific Avenue
Fuel & Cost
Regular Gas
$47.03 one way
$94.05 round trip
$4.95/gal25.4 MPG avg85 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.18
$49.27
$98.54
premium
$5.39
$51.24
$102.47
diesel
$4.80
$45.58
$91.16
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$47
Meals
$25–$50
Total
$72–$97
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 84.5 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $25 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
72.4
0
$25.35
$11.59
Efficient EV
60.4
0
$21.12
$9.66
EV Truck/SUV
96.6
1
$33.80
$15.45
Gas CO2
84 kg
EV CO2
28 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 18, 2026
Origin
Grand Coulee, WA
Late night
in Grand Coulee on Sunday
Local time
3:28 AM
PDT
Current temp
93°F
Sunny
SW 6 to 15 mph0% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Destination
Tacoma, WA
Late night
in Tacoma on Sunday
Local time
3:28 AM
PDT
Current temp
70°F
Mostly Sunny
WNW 5 mph1% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
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
23 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
4h 56m 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.
Klondike Gold Rush - Seattle Unit National Historical Park
National Historical Park
Seattle flourished during and after the Klondike Gold Rush. Merchants supplied people from around the world passing through this port city on their way to a remarkable adventure in the Yukon Territory...
19 mi from route
~49 min detour
Free
near mile 216.5
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive is mostly highway, with 68% of the 241.4 miles on faster roads. You'll encounter the longest continuous stretch on I 90, covering 125.7 miles. After that, you'll transition to State Route 18 and then Coulee Boulevard for the remainder of the trip. Expect a shift from highway cruising to more developed surface roads as you approach your destination.
68% highway — fuel and pacing are the main things to plan.
33 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 125.7 mi on I 90.
How Hard Is This Drive?
10/10
This is a straightforward highway drive that stays mostly on I 90 and State Route 18. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 203.5 miles in.
Driving Effort10/10
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 25 significant decision points across 241.4 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 203.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 203.7 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 231.4 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Gently rolling terrain
2,552 ft250 ft
Total Climb
2,718 ft
Total Descent
3,937 ft
Highest Point
2,552 ft
~172.5 mi in
Elevation Range
2,302 ft
Notable High Points
2,522 ft at ~103.5 miles+1,004 ft prominence
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 Grand Coulee, WA to Tacoma, WA, road signs begin pointing toward Snoqualmie Parkway: Auburn along the way.
Grand Coulee is a city in the Columbia River Plateau of Washington State. It is on the shore of Lake Roosevelt just above the Grand Coulee Dam, the largest hydroelectric power producer in the United States.
This guide includes the neighboring communities of Electric City and Coulee Dam.
Tacoma, a major port on the Puget Sound, is the third-largest city in Washington State, with about 220,000 residents. It has a dynamic art scene and a great ballet.
Top landmarks
•Tacoma Narrows Bridge — suspension bridge that collapsed in 1940
•Browns Point Light — lighthouse in Washington, United States
•Fort Nisqually — an important fur trading and farming post of the Hudson's Bay Company
Doable as a same-day drive at 4h 56m. Total distance: 241.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 56m drive, comfortable solo distance.
Frequently Asked Questions
The longest stretch is about 125.7 miles on I 90. The full list of main roads is in the Roads section above.
Yes — we found about 11 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 Tacoma, WA 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 11 rest areas along the route for bathroom stops.
The main spots that need attention: at 203.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 203.7 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 231.4 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Klondike Gold Rush - Seattle Unit National Historical Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.9 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 Tacoma, WA, but most travelers stay overnight.
