Origin
Green Valley, SD
Morning in Green Valley on Thursday
Local time
11:50 AM
MDT
Current temp
46°F
Unavailable
Live forecast
Trip from Green Valley, SD to Keystone, SD
Last recalculated Apr 16, 2026
Drive Time
37m
Distance
26 mi
42 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$4
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 34m
★
6 AM
0h 37m
8 AM
0h 43m
10 AM
0h 39m
12 PM
0h 39m
3 PM
0h 39m
5 PM
0h 43m
8 PM
0h 35m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Keystone, SD
Patrick
Trip Overview
The drive from Green Valley, SD to Keystone, SD covers 26 miles and takes about 37m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on South Highway 16, East Highway 44, US 16A for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 12 miles on South Highway 16. At current regular gas prices, budget about $4.06 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 37m. Total distance: 26 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
37m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (69%). Straightforward navigation.
Drive Character
This is a 37m highway drive covering 26 miles, with most of the trip on South Highway 16 and East Highway 44. The longest continuous stretch is about 12 miles on South Highway 16.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 13 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
South Highway 16 is the longest continuous segment at about 12 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on South Highway 16 and East Highway 44. There are only a few real navigation decisions along the way. The trickiest moment comes around 3.4 miles in.
Driving Effort
3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 37m drive. You will face about 6 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: at 3.4 miles: Navigation decision point; at 4 miles (US 16 Truck; SD 79 / Elk Vale Road): Merge point - match speed before joining; at 22.8 miles (US 16A): Exit ramp - move to the correct lane early. Lane positioning matters here.
Critical Maneuvers
5 of 6 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
3
3.4 mi into trip
|
~5m in
Take the ramp
Navigation decision point
3
4 mi into trip
|
~7m in
|
US 16 Truck; SD 79 / Elk Vale Road
Merge onto US 16 Truck; SD 79 / Elk Vale Road
Merge point - match speed before joining
5
22.8 mi into trip
|
~30m in
|
US 16A
Take the exit onto US 16A
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / left lanes.
6
25.5 mi into trip
|
~35m in
|
SD 40 / Reed Street
Turn left onto SD 40 / Reed Street
Lane positioning matters here
Use the straight / left lanes.
5
25.9 mi into trip
|
~36m in
Turn right
Navigation decision point
Main Roads
| Road | Distance | Duration |
|---|---|---|
| South Highway 16 | 12 mi | 14m |
| East Highway 44 | 3.3 mi | 5m |
| US 16A | 2.7 mi | 5m |
| Elk Vale Road | 2.3 mi | 2m |
| Catron Boulevard | 2.2 mi | 3m |
| East Catron Boulevard | 1.2 mi | 1m |
| Mount Rushmore Road | 1.1 mi | 1m |
| Reed Street | 0.4 mi | 1m |
Longest stretch:
South Highway 16
— 12 mi, about 14m
Turn-by-Turn Driving Directions
Step-by-step road directions between Green Valley, SD and Keystone, SD.
1
Start on Anderson Road
0.2 mi
·
43 sec
·
Anderson Road
2
Turn left onto SD 44
3.3 mi
·
5 min
·
East Highway 44
3
Take the ramp
0.5 mi
·
1 min
4
Merge onto US 16 Truck; SD 79
2.3 mi
·
2 min
·
Elk Vale Road
5
Continue on US 16 Truck
1.2 mi
·
1 min
·
East Catron Boulevard
6
Continue on US 16 Truck
2.2 mi
·
3 min
·
Catron Boulevard
7
Turn left onto US 16
1.1 mi
·
1 min
·
Mount Rushmore Road
8
Continue on US 16
12 mi
·
14 min
·
South Highway 16
9
Take the exit onto US 16A
2.7 mi
·
5 min
·
US 16A
Use the straight / left lanes.
10
Turn left onto SD 40
0.4 mi
·
1 min
·
Reed Street
Use the straight / left lanes.
11
Continue on SD 40
510 ft
·
19 sec
·
1st Street
12
Turn right
93 ft
·
6 sec
13
Arrive at destination
Fuel & Cost
Regular Gas
$4.06 one way
$8.13 round trip
$3.97/gal
25.4 MPG avg
9 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $4.46 | $8.93 |
| premium | $4.89 | $5.00 | $10.01 |
| diesel | $5.61 | $5.74 | $11.48 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$4
Estimated CO2 emission: 9.1 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 7.8 | 0 | $2.73 | $1.25 |
| Efficient EV | 6.5 | 0 | $2.28 | $1.04 |
| EV Truck/SUV | 10.4 | 0 | $3.64 | $1.66 |
Gas CO2
9 kg
EV CO2
3 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
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
Keystone, SD
Morning in Keystone on Thursday
Local time
11:50 AM
MDT
Current temp
45°F
Unavailable
Live forecast
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
1 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
37m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Green Valley, SD to Keystone, SD covers 26 miles and takes about 37m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are South Highway 16, East Highway 44, US 16A. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 13 miles from Green Valley, SD. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $4.06 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This is a straightforward 37m drive. You will face about 6 decision points, but nothing that requires special attention if you follow navigation.
The main spots that need attention: at 3.4 miles: Navigation decision point; at 4 miles (US 16 Truck; SD 79 / Elk Vale Road): Merge point - match speed before joining; at 22.8 miles (US 16A): Exit ramp - move to the correct lane early. Lane positioning matters here.
The route from Green Valley, SD to Keystone, SD does not surface many named destination signs beyond the main corridor.
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