Origin
Gregory, SD
Evening in Gregory on Sunday
Local time
6:05 PM
CDT
Current temp
43°F
Unavailable
Live forecast
Trip from Gregory, SD to Rapid City, SD
Drive Time
4h 29m
Distance
242.1 mi
390 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$37
one way
EV Charging
Loading...
station data
Best Time to Leave
4 AM
4h 16m
★
6 AM
4h 30m
8 AM
4h 56m
10 AM
4h 39m
12 PM
4h 36m
3 PM
4h 40m
5 PM
4h 55m
8 PM
4h 22m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Gregory, SD
Luis Quintero
Rapid City, SD
Mike Lensing
Trip Overview
Traveling from Gregory to Rapid City covers 242.1 miles and typically takes about 4 hours and 29 minutes of drive time. Because this journey stays within the Great Plains region of South Dakota, you can comfortably complete the trip in a single day without needing an overnight stay. Expect to spend approximately $37 on fuel for the trek. You will primarily navigate via US Highway 18 and I-90, making this a straightforward route for those looking to reach the Black Hills area efficiently. It is a practical, no-nonsense drive that serves as a direct link between the rural landscape of Gregory and the more populated Rapid City.
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
121 miles from Gregory, SD
A natural place for your longest stop of the day , about 2h 32m into the drive .
Drive Character
This trip is heavily highway-focused, with 84% of your travel occurring on major thoroughfares. You will start on local roads before transitioning to US Highway 18 and eventually merging onto I-90. The backbone of your journey is a 168.6-mile stretch on I-90, which provides a consistent, high-speed experience across the plains. While the initial segments through 307th Avenue offer a more localized feel, the majority of your time behind the wheel will be spent maintaining steady interstate speeds. Anticipate a drive that prioritizes efficiency and connectivity over winding backroads or technical terrain.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 11 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 168.6 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 90 and 307th Avenue. There are only a few real navigation decisions along the way. The trickiest moment comes around 0.2 miles in near SD 47 / Park Avenue.
Route Complexity
3/10
Easy - simple navigation with a manageable amount of wheel time
This is a straightforward 4h 29m drive. You will face about 8 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: at 0.2 miles (SD 47 / Park Avenue): Navigation decision point; at 35 miles (US 183; SD 44; SD 53 / 307th Avenue): Lane positioning matters here; at 71.1 miles (I 90): Merge point - match speed before joining. Lane positioning matters here.
Critical Maneuvers
5 of 8 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
5
0.2 mi into trip
|
~1m in
|
SD 47 / Park Avenue
At end of road, turn left onto SD 47 / Park Avenue
Navigation decision point
6
35 mi into trip
|
~52m in
|
US 183; SD 44; SD 53 / 307th Avenue
Turn right onto US 183; SD 44; SD 53 / 307th Avenue
Lane positioning matters here
Use the none lane.
5
71.1 mi into trip
|
~1h 44m in
|
I 90
Merge onto I 90
Merge point - match speed before joining. Lane positioning matters here
Use the none lane.
5
239.8 mi into trip
|
~4h 25m in
Take the exit toward I 190, US 16: Downtown, Black Hawk National Forest, Mount Rushmore
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward I 190, US 16: Downtown, Black Hawk Natio...
7
241.8 mi into trip
|
~4h 28m in
|
US 16 / Mount Rushmore Road
Turn right onto US 16 / Mount Rushmore Road
Lane positioning matters here
Use the right lane.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 90 | 168.6 mi | 2h 40m |
| 307th Avenue | 35.8 mi | 51m |
| US Highway 18 | 34.4 mi | 51m |
| I 190 | 1.4 mi | 1m |
| Park Avenue | 0.4 mi | <1m |
| East 6th Street | 0.2 mi | 1m |
| Mount Rushmore Road | 0.2 mi | <1m |
| Omaha Street | 0.2 mi | <1m |
Longest stretch:
I 90
— 168.6 mi, about 2h 40m
Turn-by-Turn Driving Directions
Step-by-step road directions between Gregory, SD and Rapid City, SD.
1
Start on East 6th Street
0.2 mi
·
1 min
·
East 6th Street
2
At end of road, turn left onto SD 47
0.4 mi
·
43 sec
·
Park Avenue
3
Turn right onto US 18
34 mi
·
51 min
·
US Highway 18
4
Turn right onto US 183; SD 44; SD 53
36 mi
·
51 min
·
307th Avenue
Use the none lane.
5
Take the ramp
0.3 mi
·
44 sec
6
Merge onto I 90
169 mi
·
2 hr 40 min
·
I 90
Use the none lane.
7
Take the exit
0.4 mi
·
1 min
Toward I 190, US 16: Downtown, Black Hawk National Forest, Mount Rushmore
8
Continue on I 190
1.4 mi
·
1 min
·
I 190
9
Turn left onto US 16; SD 44
0.2 mi
·
39 sec
·
Omaha Street
Use the none / right lanes.
10
Turn right onto US 16
0.2 mi
·
45 sec
·
Mount Rushmore Road
Use the right lane.
11
Arrive at destination
US 16
Trip Plan
Since the trip is just under four and a half hours, you have plenty of flexibility to depart whenever suits your schedule best. With only one recommended stop planned, try to time your break to coincide with your transition onto I-90 to maximize your momentum. Keep an eye on your fuel gauge during the initial segments on US Highway 18, as services may be more spread out before you hit the main interstate corridor. Because you are tackling a significant 168.6-mile stretch on the interstate, ensure your vehicle is prepped for sustained speeds to keep your total fuel costs near the estimated $37. Taking advantage of the single planned stop will help keep you refreshed as you navigate the transition from the Great Plains toward Rapid City.
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 121 miles from Gregory, SD, or about 2h 32m into the drive.
The longest continuous stretch on this route runs about 168.6 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 53m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 121 miles or 2h 32m 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 45m
Traffic, exits, and arrival timing usually matter more near Rapid City, SD than in the middle of the route.
Before You Leave
+
Open the route before leaving Gregory, 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 Gregory, SD
This is one driving day of about 242.1 miles and 4h 29m.
Your first comfortable stop window is around 80 miles from Gregory, 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 168.6 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 121 mi from Gregory, SD · 2h 32m into the drive
Mid-route town
Meal stop
121 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 121 miles from Gregory, 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 168.6 miles.
Arriving in Rapid City, SD
The final approach into Rapid City, 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 Rapid City, 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
$36.77 one way
$73.55 round trip
$3.86/gal
25.4 MPG avg
85 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.25 | $40.54 | $81.07 |
| premium | $4.80 | $45.70 | $91.41 |
| diesel | $5.64 | $53.79 | $107.57 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$37
Meals
$25–$50
Total
$62–$87
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 84.7 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $25 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 72.6 | 0 | $25.42 | $11.62 |
| Efficient EV | 60.5 | 0 | $21.18 | $9.68 |
| EV Truck/SUV | 96.8 | 1 | $33.89 | $15.49 |
Gas CO2
85 kg
EV CO2
28 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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
Rapid City, SD
Evening in Rapid City on Sunday
Local time
5:05 PM
MDT
Current temp
40°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 earlier
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
3 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
4h 29m 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 Gregory, SD to Rapid City, SD covers 242.1 miles and takes about 4h 29m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 90, 307th Avenue, US Highway 18. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 121 miles from Gregory, SD. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $36.77 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 4h 29m drive. You will face about 8 decision points, but nothing that requires special attention if you follow navigation.
The main spots that need attention: at 0.2 miles (SD 47 / Park Avenue): Navigation decision point; at 35 miles (US 183; SD 44; SD 53 / 307th Avenue): Lane positioning matters here; at 71.1 miles (I 90): Merge point - match speed before joining. Lane positioning matters here.
The route from Gregory, SD to Rapid City, SD does not surface many named destination signs beyond the main corridor.
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