Origin
Spearfish, SD
Evening in Spearfish on Thursday
Local time
5:28 PM
MDT
Current temp
73°F
Unavailable
Live forecast
Trip from Spearfish, SD to Lennox, SD
Last recalculated Apr 16, 2026
Drive Time
6h 37m
Distance
396.9 mi
639 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$62
one way
EV Charging
Unknown
Best Time to Leave
4 AM
6h 25m
★
6 AM
6h 37m
8 AM
7h 1m
10 AM
6h 45m
12 PM
6h 43m
3 PM
6h 47m
5 PM
7h 0m
8 PM
6h 30m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Spearfish, SD
Wikimedia Commons
Lennox, SD
Julio Lopez
Trip Overview
The drive from Spearfish, SD to Lennox, SD covers 396.9 miles and takes about 6h 37m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 90, South SD Highway 17, 463rd Avenue for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 374.8 miles on I 90. At current regular gas prices, budget about $62.05 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
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
198.4 miles from Spearfish, SD
A natural place for your longest stop of the day , about 3h 12m into the drive .
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 6h 37m. Total distance: 396.9 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 37m drive, plan rest stops for pacing.
First-Time Driver
Mostly highway driving (97%). Straightforward navigation.
Drive Character
This is a 6h 37m highway drive covering 396.9 miles, with most of the trip on I 90 and South SD Highway 17. The longest continuous stretch is about 374.8 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 19 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 374.8 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 90 and South SD Highway 17. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near East Jackson Boulevard.
Driving Effort
3/10
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 6h 37m, endurance matters. Plan breaks every 2-3 hours. The 11 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 376 miles: Highway fork - watch signs carefully.
Critical Maneuvers
5 of 11 key pointsThese 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
4
376 mi into trip
|
~6h in
Keep slight right at fork
Highway fork - watch signs carefully
4
380.4 mi into trip
|
~6h 8m in
|
SD 42 / 265th Street
Turn left onto SD 42 / 265th Street
Navigation decision point
5
396.2 mi into trip
|
~6h 35m in
|
East Boynton Avenue
Turn right onto East Boynton Avenue
Navigation decision point
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 90 | 374.8 mi | 5h 56m |
| South SD Highway 17 | 9.6 mi | 16m |
| 463rd Avenue | 4.4 mi | 7m |
| 466th Avenue | 3 mi | 5m |
| 265th Street | 3 mi | 4m |
| East Jackson Boulevard | 0.5 mi | 1m |
| North Main Street | 0.4 mi | 1m |
| East Boynton Avenue | 0.3 mi | <1m |
Longest stretch:
I 90
— 374.8 mi, about 5h 56m
Turn-by-Turn Driving Directions
Step-by-step road directions between Spearfish, SD and Lennox, 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
329 mi
·
5 hr 10 min
·
I 90; US 14; US 16 Truck; SD 79
9
Take the exit
0.3 mi
·
40 sec
10
Keep slight right at fork
247 ft
·
6 sec
11
Turn straight onto CR 151
4.4 mi
·
7 min
·
463rd Avenue
12
Turn left onto SD 42
3.0 mi
·
4 min
·
265th Street
13
Turn right onto CR 145
3.0 mi
·
5 min
·
466th Avenue
14
Continue on CR 105
9.6 mi
·
16 min
·
South SD Highway 17
15
Continue on CR 105
0.2 mi
·
19 sec
·
North Pine Street
16
Turn right onto East Boynton Avenue
0.3 mi
·
48 sec
·
East Boynton Avenue
17
Turn left onto North Main Street
0.4 mi
·
54 sec
·
North Main Street
18
Turn right onto West 2nd Avenue
70 ft
·
3 sec
·
West 2nd Avenue
19
Arrive at destination
West 2nd Avenue
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 1 meaningful break for fuel, food, and rest.
The halfway point lands around 198.4 miles from Spearfish, SD, or about 3h 12m into the drive.
The longest continuous stretch on this route runs about 374.8 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 87 miles or 1h 27m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 198.4 miles or 3h 12m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 23m
Traffic, exits, and arrival timing usually matter more near Lennox, 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.
Day 1
Settle into the route from Spearfish, SD
This is one driving day of about 396.9 miles and 6h 37m.
Your first comfortable stop window is around 87 miles from Spearfish, SD.
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 374.8 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 198.4 mi from Spearfish, SD · 3h 12m into the drive
Mid-route town
Meal stop
198 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 87 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 198.4 miles from Spearfish, SD, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel checkTop up before I 90 if your tank is already low. That segment runs about 374.8 miles.
Arriving in Lennox, SD
The final approach into Lennox, 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 Lennox, 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.
Fuel & Cost
Regular Gas
$62.05 one way
$124.10 round trip
$3.97/gal
25.4 MPG avg
139 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $68.13 | $136.26 |
| premium | $4.89 | $76.38 | $152.76 |
| diesel | $5.61 | $87.63 | $175.26 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$62
Meals
$25–$50
Total
$87–$112
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 138.9 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $42 in charging · 1 stop · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 119.1 | 1 | $41.67 | $19.05 |
| Efficient EV | 99.2 | 1 | $34.73 | $15.88 |
| EV Truck/SUV | 158.8 | 1 | $55.57 | $25.40 |
Gas CO2
139 kg
EV CO2
46 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.
Destination
Lennox, SD
Evening in Lennox on Thursday
Local time
6:28 PM
CDT
Current temp
48°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
25 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
6h 37m 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 Lennox, SD covers 396.9 miles and takes about 6h 37m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 90, South SD Highway 17, 463rd Avenue. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 198.4 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 $62.05 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 1 meaningful break 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 6h 37m, endurance matters. Plan breaks every 2-3 hours. The 11 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 376 miles: Highway fork - watch signs carefully.
The route from Spearfish, SD to Lennox, SD does not surface many named destination signs beyond the main corridor.
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