Origin
Spearfish, SD
Evening in Spearfish on Sunday
Local time
6:21 PM
MDT
Current temp
40°F
Unavailable
Live forecast
Trip from Spearfish, SD to Gregory, SD
Drive Time
5h 13m
Distance
285.7 mi
460 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$43
one way
EV Charging
Loading...
station data
Best Time to Leave
4 AM
5h 0m
★
6 AM
5h 13m
8 AM
5h 40m
10 AM
5h 23m
12 PM
5h 20m
3 PM
5h 24m
5 PM
5h 39m
8 PM
5h 5m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Spearfish, SD
Wikimedia Commons
Gregory, SD
Luis Quintero
Trip Overview
Spanning 285.7 miles across the South Dakota Great Plains, this drive typically takes about 5 hours and 13 minutes to complete. Because the route is straightforward, it is easily manageable as a single-day trip. You should budget approximately $43 for fuel to cover the distance between Spearfish and Gregory. Since both locations are situated within the Great Plains, you can expect a consistent landscape throughout the journey. This trip is an ideal choice if you prefer a focused drive that gets you to your destination efficiently without the need for an overnight stay.
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
142.8 miles from Spearfish, SD
A natural place for your longest stop of the day , about 2h 20m into the drive .
Drive Character
Expect a highway-focused experience, as 87% of your travel occurs on major thoroughfares. The journey begins with a significant 213.8-mile stretch on I-90, which allows for steady progress across the state. As you transition from the interstate onto US-183 and 277th Street, the road environment shifts, requiring a bit more attention to navigation. While the majority of the trip is an interstate grind, the final segments offer a change of pace from the long, uninterrupted highway miles. You will find that the road remains consistent and predictable, making it a reliable route for those who value steady travel speeds.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 14 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 213.8 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 90 and US 183. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near East Jackson Boulevard.
Route Complexity
3/10
Easy - simple navigation with a manageable amount of wheel time
This is a straightforward 5h 13m drive. You will face about 9 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 (East Jackson Boulevard): Navigation decision point; at 0.6 miles: Multiple destination signs - pick the right one; at 214.7 miles: Exit ramp - move to the correct lane early.
Critical Maneuvers
5 of 9 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
214.7 mi into trip
|
~3h 28m in
Take the exit toward US 183: Winner
Exit ramp - move to the correct lane early
Toward US 183: Winner
5
215 mi into trip
|
~3h 29m in
|
US 183
Turn right onto US 183
Lane positioning matters here
Use the none lane.
5
250.7 mi into trip
|
~4h 20m in
|
US 18; US 183; SD 44 / 277th Street
At end of road, turn left onto US 18; US 183; SD 44 / 277th Street
Navigation decision point
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 90 | 213.8 mi | 3h 25m |
| US 183 | 35.7 mi | 50m |
| 277th Street | 34.4 mi | 51m |
| East Jackson Boulevard | 0.5 mi | 1m |
| Park Avenue | 0.4 mi | <1m |
| West 6th Street | 0.2 mi | <1m |
| North Main Street | <0.1 mi | <1m |
| East 6th Street | Unavailable | Refreshing |
Per-road distance and duration are being refreshed from OSRM for this route.
Longest stretch:
I 90
— 213.8 mi, about 3h 25m
Turn-by-Turn Driving Directions
Step-by-step road directions between Spearfish, SD and Gregory, 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
168 mi
·
2 hr 40 min
·
I 90; US 14; US 16 Truck; SD 79
Use the none lane.
9
Take the exit
0.3 mi
·
42 sec
Toward US 183: Winner
10
Turn right onto US 183
36 mi
·
50 min
·
US 183
Use the none lane.
11
At end of road, turn left onto US 18; US 183; SD 44
34 mi
·
51 min
·
277th Street
12
Turn left onto SD 47
0.4 mi
·
41 sec
·
Park Avenue
13
Turn right onto West 6th Street
0.2 mi
·
56 sec
·
West 6th Street
14
Arrive at destination
East 6th Street
Trip Plan
For the best experience, aim for a morning departure to comfortably handle the 5-hour and 13-minute travel time before dusk. Since the plan includes one primary stop, try to time your break after finishing the long 213.8-mile stretch on I-90 to maximize your momentum. Keep an eye on your fuel gauge during the final transition onto US-183 and 277th Street, as service options may be less frequent than on the interstate. Flexibility is a key advantage here, so feel free to adjust your pace if weather conditions on the Great Plains shift. Always double-check your route map before leaving the interstate, as the transition to local roads requires a clear plan for your final approach into Gregory.
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 142.8 miles from Spearfish, SD, or about 2h 20m into the drive.
The longest continuous stretch on this route runs about 213.8 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 80 miles or 1h 20m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 142.8 miles or 2h 20m 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 56m
Traffic, exits, and arrival timing usually matter more near Gregory, 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 285.7 miles and 5h 13m.
Your first comfortable stop window is around 80 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 213.8 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 142.8 mi from Spearfish, SD · 2h 20m into the drive
Mid-route town
Meal stop
143 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 80 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 142.8 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 213.8 miles.
Arriving in Gregory, SD
The final approach into Gregory, 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 Gregory, 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
$43.39 one way
$86.79 round trip
$3.86/gal
25.4 MPG avg
100 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.25 | $47.84 | $95.68 |
| premium | $4.80 | $53.93 | $107.87 |
| diesel | $5.64 | $63.47 | $126.95 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$43
Meals
$25–$50
Total
$68–$93
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 100 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $30 in charging · 1 stop · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 85.7 | 1 | $30.00 | $13.71 |
| Efficient EV | 71.4 | 0 | $25.00 | $11.43 |
| EV Truck/SUV | 114.3 | 1 | $40.00 | $18.28 |
Gas CO2
100 kg
EV CO2
33 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
Gregory, SD
Evening in Gregory on Sunday
Local time
7:21 PM
CDT
Current temp
43°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
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
5h 13m 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.
Frequently Asked Questions
The drive from Spearfish, SD to Gregory, SD covers 285.7 miles and takes about 5h 13m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 90, US 183, 277th 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 142.8 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 $43.39 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
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.
This is a straightforward 5h 13m drive. You will face about 9 decision points, but nothing that requires special attention if you follow navigation.
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 214.7 miles: Exit ramp - move to the correct lane early.
The route from Spearfish, SD to Gregory, SD does not surface many named destination signs beyond the main corridor.
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