How far is Green Valley, SD from Keystone, SD?
The driving distance from Green Valley, SD to Keystone, SD is about 26 miles (41.8 km), with a travel time of about 00h 37m by car.
- The straight-line flight distance is about 18.1 miles (29.1 km).
- For a round trip, plan for roughly 01h 14m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM MDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 37m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Township in Pennington County, South Dakota
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Green Valley and Keystone.
Turn-by-Turn Driving Directions
Step-by-step road directions between Green Valley and Keystone.
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1
Start on Anderson Road
983 ft · 43 sec · Anderson Road
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2
Turn left onto East Highway 44
3.3 mi · 5 min · East Highway 44
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3
Take the ramp left
2705 ft · 1 min
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4
Merge slight left onto Elk Vale Road
2.3 mi · 3 min · Elk Vale Road
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5
Continue on East Catron Boulevard
1.2 mi · 2 min · East Catron Boulevard
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6
Continue on Catron Boulevard
2.2 mi · 3 min · Catron Boulevard
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7
Turn left onto Mount Rushmore Road
1.1 mi · 1 min · Mount Rushmore Road
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8
Continue on South Highway 16
12 mi · 14 min · South Highway 16
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9
Take the exit slight left
2.7 mi · 5 min
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10
Turn left onto Reed Street
1913 ft · 1 min · Reed Street
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11
Continue on 1st Street
155 m · 20 sec · 1st Street
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12
Turn right
28 m · 7 sec
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13
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Green Valley and Keystone.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
South Highway 16
Continue on South Highway 16
12 mi · 00h 14m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Sunny leaving Green Valley and Sunny near Keystone.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Green Valley to Keystone?
The road trip is about 26 miles (41.8 km) and usually takes 00h 37m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Colonial Pine Hills is a useful midpoint, sitting about 13 miles from Green Valley and 13 miles from Keystone.
How much longer is the road route than the straight-line distance?
The direct path is about 18.1 miles (29.1 km), while the road route adds roughly 7.9 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 7:00 AM to 7:00 PM MDT. If you want a more comfortable same-day return, try to leave by 7:16 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.47 one way or $6.94 round trip. Estimated CO2 is about 8.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Green Valley and Sunny near Keystone.
Stop Ideas Near Colonial Pine Hills
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Willow Park
City of Rapid City
Rapid City City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Colonial Pine Hills.
Flight Path Map
This map shows the direct air route between Green Valley and Keystone. Straight-line distance: 18.07 mi (29.08 km).
#1 Green Valley
Township in Pennington County, South Dakota
| Population | 49 |
| Coordinates | 44.0355400, -103.1112900 |
| Altitude | 925 |
| Country | United States |
#2 Keystone
Town in Pennington County, South Dakota
| Population | 352 |
| Coordinates | 43.8955400, -103.4182500 |
| Altitude | 1320 |
| Country | United States |
End: Keystone (-103.41825, 43.89554)
Estimated Travel Time
Distance: 42 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 51m |
| 40 mph (64.37 km/h) | 00h 38m |
| 50 mph (80.47 km/h) | 00h 31m |
| 60 mph (96.56 km/h) | 00h 25m |
| 70 mph (112.65 km/h) | 00h 22m |
| 80 mph (129 km/h) | 00h 19m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.47 | $6.94 |
| Mid-grade | $4.25 | $3.91 | $7.83 |
| Premium | $4.65 | $4.28 | $8.56 |
| Diesel | $5.30 | $4.88 | $9.76 |
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 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.