How far is Castle Rock, CO from Sterling, CO?
The driving distance from Castle Rock, CO to Sterling, CO is about 157.1 miles (252.9 km), with a travel time of about 02h 44m by car.
- The straight-line flight distance is about 122.9 miles (197.8 km).
- For a round trip, plan for roughly 05h 28m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 44m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 Weld County, Colorado, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Castle Rock and Sterling.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Rock and Sterling.
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1
Start on North Cantril Street
27 m · 8 sec · North Cantril Street
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2
Turn left onto 3rd Street
641 ft · 23 sec · 3rd Street
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3
Exit the roundabout onto 3rd Street
135 m · 18 sec · 3rd Street
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4
Turn right onto North Wilcox Street
2807 ft · 2 min · North Wilcox Street
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5
Take the ramp straight toward I 25 North
1715 ft · 42 sec
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6
Merge slight left
11.7 mi · 12 min
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7
Take the exit slight right toward CO 470 West, E 470 North Toll: Grand Junction, Limon
865 ft · 21 sec
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8
Keep slight right to continue on E-470 North: Limon
2718 ft · 1 min
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9
Merge slight left onto E-470
34.4 mi · 34 min · E-470
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10
Take the exit slight right toward I 76 East: Fort Morgan
1.1 mi · 2 min
-
11
Merge slight left onto Heartland Expressway
105.6 mi · 1 hr 46 min · Heartland Expressway
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12
Take the exit slight right toward US 6: Sterling, Holyoke
2004 ft · 49 sec
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13
Keep slight left to continue on US 6 West: Sterling
56 m · 6 sec
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14
Turn left onto US Highway 6
3251 ft · 1 min · US Highway 6
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15
Continue on East Chestnut Street
1.4 mi · 3 min · East Chestnut Street
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16
Turn left onto North 3rd Street
84 m · 10 sec · North 3rd Street
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17
Turn right
73 m · 18 sec
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18
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Castle Rock and Sterling.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Heartland Expressway
Merge slight left onto Heartland Expressway
106 mi · 01h 46m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving Castle Rock and Sunny near Sterling.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Castle Rock to Sterling?
The road trip is about 157.1 miles (252.9 km) and usually takes 02h 44m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Keenesburg is a useful midpoint, sitting about 78.5 miles from Castle Rock and 78.6 miles from Sterling.
How much longer is the road route than the straight-line distance?
The direct path is about 122.9 miles (197.8 km), while the road route adds roughly 34.2 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 8:00 AM to 10:00 AM MDT. If you want a more comfortable same-day return, try to leave by 1:02 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $20.49 one way or $40.97 round trip. Estimated CO2 is about 49.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Castle Rock and Sunny near Sterling.
Stop Ideas Near Keenesburg
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Keenesburg.
Longmont, Colorado
Denver (Bus Station), Colorado
Union Station
Fort Morgan
Flight Path Map
This map shows the direct air route between Castle Rock and Sterling. Straight-line distance: 122.93 mi (197.83 km).
#1 Castle Rock
The most populous city in Douglas County, Colorado.
| Population | 70,567 |
| Coordinates | 39.3722100, -104.8560900 |
| Altitude | 1897 |
| Country | United States |
#2 Sterling
City in Colorado
| Population | 14,078 |
| Coordinates | 40.6255400, -103.2077100 |
| Altitude | 1200 |
| Country | United States |
End: Sterling (-103.20771, 40.62554)
Estimated Travel Time
Distance: 253 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 14m |
| 40 mph (64.37 km/h) | 03h 55m |
| 50 mph (80.47 km/h) | 03h 08m |
| 60 mph (96.56 km/h) | 02h 37m |
| 70 mph (112.65 km/h) | 02h 14m |
| 80 mph (129 km/h) | 01h 57m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $20.49 | $40.97 |
| Mid-grade | $4.08 | $22.63 | $45.25 |
| Premium | $4.39 | $24.33 | $48.65 |
| Diesel | $4.74 | $26.24 | $52.49 |
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 Colorado · 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.