The drive from Spearfish, SD to Jefferson, SD covers 460.5 miles and takes about 7h 23m behind the wheel.
This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 90, I 29, West Dakota Street for much of the mileage,
and the overall profile is highway-focused drive.
The longest uninterrupted segment is about 383.9 miles on I 90.
At current regular gas prices, budget about $71.99 one way before food or hotel costs.
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
230.2 miles from Spearfish, SD
A natural place for your longest stop of the day
, about 3h 42m into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 7h 23m. Total distance: 460.5 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
This is a 7h 23m highway drive covering 460.5 miles, with most of the trip on I 90 and I 29. The longest continuous stretch is about 383.9 miles on I 90.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 16 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 90 is the longest continuous segment at about 383.9 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 90 and I 29. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near East Jackson Boulevard.
Driving Effort4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
The route itself is not hard, but at 7h 23m, endurance matters. Plan breaks every 2-3 hours. The 10 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: near the start (East Jackson Boulevard): Navigation decision point; at 0.6 miles: Multiple destination signs - pick the right one; at 385.2 miles (I 29): Merge point - match speed before joining. Lane positioning matters here.
Critical Maneuvers
5 of 10 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
4
0 mi into trip|~0m in|East Jackson Boulevard
Turn right onto East Jackson Boulevard
Navigation decision point
5
0.6 mi into trip|~2m in
Take the ramp toward I 90 East, US 85 South
Multiple destination signs - pick the right one
Toward I 90 East, US 85 South
5
385.2 mi into trip|~6h 9m in|I 29
Merge onto I 29
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
4
459.3 mi into trip|~7h 21m in
Take the exit toward Jefferson
Exit ramp - move to the correct lane early
Toward Jefferson
5
460.5 mi into trip|~7h 23m in|South 3rd Street
Turn right onto South 3rd Street
Navigation decision point
Main Roads
Road
Distance
Duration
I 90
383.9 mi
6h 5m
I 29
74.1 mi
1h 11m
West Dakota Street
0.8 mi
1m
East Jackson Boulevard
0.5 mi
1m
Main Street
0.2 mi
<1m
330th Street
<0.1 mi
<1m
North Main Street
<0.1 mi
<1m
South 3rd Street
<0.1 mi
<1m
Longest stretch:
I 90
— 383.9 mi, about 6h 5m
Turn-by-Turn Driving Directions
Step-by-step road directions between Spearfish, SD and Jefferson, SD.
1
Start on I 90 Business
85 ft·30 sec·North Main Street
2
Continue on I 90 Business
166 ft·9 sec·North Main Street
3
Turn right onto East Jackson Boulevard
0.5 mi·1 min·East Jackson Boulevard
4
Take the ramp
0.3 mi·37 sec
Toward I 90 East, US 85 South
5
Merge onto I 90; US 14; US 85
14 mi·14 min·I 90; US 14; US 85
6
Continue on I 90; US 14; SD 34
7.6 mi·7 min·I 90; US 14; SD 34
7
Continue on I 90; US 14; SD 79
24 mi·24 min·I 90; US 14; SD 79
8
Continue on I 90; US 14; US 16 Truck; SD 79
338 mi·5 hr 19 min·I 90; US 14; US 16 Truck; SD 79
9
Take the exit
0.4 mi·57 sec
10
Merge onto I 29
74 mi·1 hr 11 min·I 29
Use the straight / slight right lanes.
11
Take the exit
0.1 mi·21 sec
Toward Jefferson
12
Turn left onto 330th Street
400 ft·8 sec·330th Street
13
Continue on West Dakota Street
0.8 mi·1 min·West Dakota Street
14
Turn right onto CR 1B
0.2 mi·25 sec·Main Street
15
Turn right onto South 3rd Street
56 ft·2 sec·South 3rd Street
16
Arrive at destination
South 3rd Street
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.
You can normally do this drive in one day.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 230.2 miles from Spearfish, SD, or about 3h 42m into the drive.
The longest continuous stretch on this route runs about 383.9 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 101 miles or 1h 40m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 230.2 miles or 3h 42m 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 24m
Traffic, exits, and arrival timing usually matter more near Jefferson, SD than in the middle of the route.
Before You Leave
+
Open the route before leaving Spearfish, SD 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 Spearfish, SD
This is one driving day of about 460.5 miles and 7h 23m.
Your first comfortable stop window is around 101 miles from Spearfish, SD.
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 I 90 for about 383.9 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 230.2 mi from Spearfish, SD
· 3h 42m into the drive
The midpoint is around 230.2 miles from Spearfish, SD, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel check
Top up before I 90 if your tank is already low. That segment runs about 383.9 miles.
Arriving in Jefferson, SD
The final approach into Jefferson, SD 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 Jefferson, SD.
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.
National Parks Near This Route
Worth a detour if your schedule allows.
Mount Rushmore National Memorial
National Memorial
Majestic figures of George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln, surrounded by the beauty of the Black Hills of South Dakota, tell the story of the birth, growth, devel...
20 mi from route
~50 min detour
Free
near mile 47.6
The rugged beauty of the Badlands draws visitors from around the world. These striking geologic deposits contain one of the world’s richest fossil beds. Ancient horses and rhinos once roamed here. The...
25 mi from route
~62 min detour
$30
near mile 95.3
Station data from NREL Alternative Fuel Stations database.
Driving Electric?
About $48 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
138.2
1
$48.35
$22.10
Efficient EV
115.1
1
$40.29
$18.42
EV Truck/SUV
184.2
2
$64.47
$29.47
Gas CO2
161 kg
EV CO2
54 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.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Apr 15, 2026
Origin
Spearfish, SD
Late night
in Spearfish on Saturday
Local time
1:49 AM
MDT
Current temp
73°F
Unavailable
Live forecast
Destination
Jefferson, SD
Late night
in Jefferson on Saturday
Local time
2:49 AM
CDT
Current temp
77°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
1 hour later
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
4 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 23m 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.
Frequently Asked Questions
The drive from Spearfish, SD to Jefferson, SD covers 460.5 miles and takes about 7h 23m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 90, I 29, West Dakota Street. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 230.2 miles from Spearfish, SD. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $71.99 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.
The route itself is not hard, but at 7h 23m, endurance matters. Plan breaks every 2-3 hours. The 10 decision points are all manageable with basic attention.
The main spots that need attention: near the start (East Jackson Boulevard): Navigation decision point; at 0.6 miles: Multiple destination signs - pick the right one; at 385.2 miles (I 29): Merge point - match speed before joining. Lane positioning matters here.
The route from Spearfish, SD to Jefferson, SD does not surface many named destination signs beyond the main corridor.
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, NREL for EV charging, and NPS for national parks. See our methodology for refresh cadence and limitations.
