How far is Spearfish, SD from Gregory, SD?
The driving distance from Spearfish, SD to Gregory, SD is about 285.7 miles (459.8 km), with a travel time of about 05h 13m by car.
- The straight-line flight distance is about 237.1 miles (381.6 km).
- For a round trip, plan for roughly 10h 26m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 05h 13m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in and county sear of in Jackson County, South Dakota, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Clear
Sunny
Driving Route Map
The map below follows the saved road route between Spearfish and Gregory.
Turn-by-Turn Driving Directions
Step-by-step road directions between Spearfish and Gregory.
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1
Start on North Main Street
26 m · 30 sec · North Main Street
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2
Continue on North Main Street
51 m · 10 sec · North Main Street
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3
Turn right onto East Jackson Boulevard
2777 ft · 2 min · East Jackson Boulevard
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4
Take the ramp right toward I 90 East, US 85 South
1555 ft · 38 sec
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5
Merge slight left
14.2 mi · 14 min
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6
Continue straight
7.6 mi · 8 min
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7
Continue straight
23.6 mi · 24 min
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8
Continue straight
168.5 mi · 2 hr 40 min
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9
Take the exit slight right toward US 183: Winner
1702 ft · 43 sec
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10
Turn right
35.7 mi · 51 min
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11
At the end of the road, turn left onto 277th Street
34.4 mi · 51 min · 277th Street
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12
Turn left onto Park Avenue
1982 ft · 42 sec · Park Avenue
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13
Turn right onto West 6th Street
1291 ft · 57 sec · West 6th Street
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14
Arrive at your destination
0 m · 1 sec · East 6th Street
Car Route Details
A richer read on the saved driving route between Spearfish and Gregory.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 90 East
Continue straight
168 mi · 02h 40m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Mostly Clear leaving Spearfish and Sunny near Gregory.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Spearfish to Gregory?
The road trip is about 285.7 miles (459.8 km) and usually takes 05h 13m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Kadoka is a useful midpoint, sitting about 142.6 miles from Spearfish and 143.1 miles from Gregory.
How much longer is the road route than the straight-line distance?
The direct path is about 237.1 miles (381.6 km), while the road route adds roughly 48.6 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 6:34 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $38.01 one way or $76.02 round trip. Estimated CO2 is about 89.6 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Spearfish and Gregory, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Mostly Clear around Spearfish and Sunny near Gregory.
Flight Path Map
This map shows the direct air route between Spearfish and Gregory. Straight-line distance: 237.12 mi (381.61 km).
#1 Spearfish
City in Lawrence County, South Dakota, United States
| Population | 11,900 |
| Coordinates | 44.4908200, -103.8593700 |
| Altitude | 1112 |
| Country | United States |
#2 Gregory
City in Gregory County, South Dakota, United States
| Population | 1,250 |
| Coordinates | 43.2322200, -99.4303800 |
| Altitude | 661 |
| Country | United States |
End: Gregory (-99.43038, 43.23222)
Estimated Travel Time
Distance: 460 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 09h 31m |
| 40 mph (64.37 km/h) | 07h 08m |
| 50 mph (80.47 km/h) | 05h 42m |
| 60 mph (96.56 km/h) | 04h 45m |
| 70 mph (112.65 km/h) | 04h 04m |
| 80 mph (129 km/h) | 03h 33m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $38.01 | $76.02 |
| Mid-grade | $4.25 | $42.87 | $85.74 |
| Premium | $4.65 | $46.91 | $93.82 |
| Diesel | $5.30 | $53.46 | $106.93 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in South Dakota · Apr 16, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.