The drive from Seattle, WA to Sudden Valley, WA covers 85.9 miles and takes about 1h 52m behind the wheel.
This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 5, South Lake Whatcom Boulevard, Alger Cain Lake Road for much of the mileage,
and the overall profile is highway-focused drive.
The longest uninterrupted segment is about 74.7 miles on I 5.
At current regular gas prices, budget about $17.98 one way before food or hotel costs.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Midpoint
43 miles from Seattle, WA
A natural place for your longest stop of the day
, about 52m into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 1h 52m. Total distance: 85.9 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
This is a 1h 52m highway drive covering 85.9 miles, with most of the trip on I 5 and South Lake Whatcom Boulevard. The longest continuous stretch is about 74.7 miles on I 5.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 17 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 5 is the longest continuous segment at about 74.7 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 5 and South Lake Whatcom Boulevard. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near Madison Street.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 1h 52m drive. You will face about 11 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: near the start (Madison Street): Navigation decision point; near the start (4th Avenue): Lane positioning matters here; at 0.2 miles (University Street): Navigation decision point.
Critical Maneuvers
5 of 11 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
5
0 mi into trip|~0m in|Madison Street
Turn left onto Madison Street
Navigation decision point
7
0 mi into trip|~0m in|4th Avenue
Turn right onto 4th Avenue
Lane positioning matters here
Use the straight lane.
5
0.2 mi into trip|~0m in|University Street
Turn right onto University Street
Navigation decision point
5
0.7 mi into trip|~2m in|I 5
Merge onto I 5
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
5
81.2 mi into trip|~1h 41m in|South Lake Whatcom Boulevard
At end of road, turn left onto South Lake Whatcom Boulevard
Navigation decision point
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 Seattle, WA to Sudden Valley, WA, road signs begin pointing toward Alger along the way.
Alger
75.4 mi in|~1h 30m
Main Roads
Road
Distance
Duration
I 5
74.7 mi
1h 28m
South Lake Whatcom Boulevard
3.5 mi
6m
Alger Cain Lake Road
2.8 mi
4m
Cain Lake Road
2.1 mi
3m
Sudden Valley Drive
1 mi
4m
Lake Samish Road
0.7 mi
1m
4th Avenue
0.2 mi
<1m
Lost Fork Lane
0.2 mi
<1m
Longest stretch:
I 5
— 74.7 mi, about 1h 28m
Turn-by-Turn Driving Directions
Step-by-step road directions between Seattle, WA and Sudden Valley, WA.
1
Start on this road
31 ft·7 sec·this road
2
Turn left onto Madison Street
204 ft·11 sec·Madison Street
3
Turn right onto 4th Avenue
0.2 mi·39 sec·4th Avenue
Use the straight lane.
4
Turn right onto University Street
0.1 mi·26 sec·University Street
5
Take the ramp
0.3 mi·41 sec
Toward I 5 North
6
Merge onto I 5
75 mi·1 hr 28 min·I 5
Use the straight / slight right lanes.
7
Take the exit
0.2 mi·30 sec
Toward Alger
8
Turn right onto Lake Samish Road
0.7 mi·1 min·Lake Samish Road
9
Continue on Alger Cain Lake Road
2.8 mi·4 min·Alger Cain Lake Road
10
Continue on Cain Lake Road
2.1 mi·3 min·Cain Lake Road
11
At end of road, turn left onto South Lake Whatcom Boulevard
3.5 mi·6 min·South Lake Whatcom Boulevard
12
Turn left onto Sudden Valley Drive
169 ft·10 sec·Sudden Valley Drive
13
Continue on Sudden Valley Drive
0.3 mi·1 min·Sudden Valley Drive
14
Continue on Sudden Valley Drive
0.7 mi·2 min·Sudden Valley Drive
15
Turn left onto Lost Fork Lane
0.2 mi·40 sec·Lost Fork Lane
16
Turn right onto Tawny Circle
280 ft·6 sec·Tawny Circle
17
Arrive at destination
Tawny Circle
Trip Plan
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
You can normally do this drive in one day.
You may only need one short stretch break if traffic stays light.
The halfway point lands around 43 miles from Seattle, WA, or about 52m into the drive.
The longest continuous stretch on this route runs about 74.7 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 19 miles or 23m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 43 miles or 52m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 1h 27m
Traffic, exits, and arrival timing usually matter more near Sudden Valley, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Seattle, WA so your first major turns are already loaded.
Day 1
Settle into the route from Seattle, WA
This is one driving day of about 85.9 miles and 1h 52m.
Your first comfortable stop window is around 19 miles from Seattle, WA.
This route can stay practical as a one-day drive if traffic stays reasonable.
The longest stretch is on I 5 for about 74.7 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.
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...
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$17.98 one way
$35.96 round trip
$5.32/gal25.4 MPG avg30 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.58
$18.85
$37.71
premium
$5.77
$19.51
$39.01
diesel
$5.61
$18.97
$37.93
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$18
Meals
$25–$50
Total
$43–$68
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 30.1 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $9 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
25.8
0
$9.02
$4.12
Efficient EV
21.5
0
$7.52
$3.44
EV Truck/SUV
34.4
0
$12.03
$5.50
Gas CO2
30 kg
EV CO2
10 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
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 Apr 15, 2026
Origin
Seattle, WA
Evening
in Seattle on Friday
Local time
6:01 PM
PDT
Current temp
49°F
Unavailable
Live forecast
Destination
Sudden Valley, WA
Evening
in Sudden Valley on Friday
Local time
6:01 PM
PDT
Current temp
52°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.
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
3 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
1h 52m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Seattle, WA to Sudden Valley, WA covers 85.9 miles and takes about 1h 52m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 5, South Lake Whatcom Boulevard, Alger Cain Lake Road. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 43 miles from Seattle, WA. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $17.98 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This is a straightforward 1h 52m drive. You will face about 11 decision points, but nothing that requires special attention if you follow navigation.
The main spots that need attention: near the start (Madison Street): Navigation decision point; near the start (4th Avenue): Lane positioning matters here; at 0.2 miles (University Street): Navigation decision point.
On the drive from Seattle, WA to Sudden Valley, WA, road signs begin pointing toward Alger along the way.
Yes. Nearby national parks include Klondike Gold Rush - Seattle Unit National Historical Park.
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, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
