How far is Milliken, CO from Castle Rock, CO?
The driving distance from Milliken, CO to Castle Rock, CO is about 83 miles (133.5 km), with a travel time of about 01h 25m by car.
- The straight-line flight distance is about 66.1 miles (106.4 km).
- For a round trip, plan for roughly 02h 50m 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 01h 25m.
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.
The seventh most populous city in Colorado.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Light Rain Likely
Chance Rain And Snow Showers
Driving Route Map
The map below follows the saved road route between Milliken and Castle Rock.
Turn-by-Turn Driving Directions
Step-by-step road directions between Milliken and Castle Rock.
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1
Start on the route
33 m · 13 sec
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2
Turn left
52 m · 14 sec
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3
Turn right onto South Grace Avenue
46 m · 14 sec · South Grace Avenue
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4
Turn left onto Broad Street
6.7 mi · 12 min · Broad Street
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5
Take the ramp slight left
1473 ft · 36 sec
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6
Merge slight left onto Dwight D. Eisenhower Highway
24.3 mi · 24 min · Dwight D. Eisenhower Highway
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7
Continue on North Valley Highway
3187 ft · 36 sec · North Valley Highway
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8
Keep slight right to continue on North Valley Highway
8.8 mi · 11 min · North Valley Highway
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9
Keep slight right to continue on North Valley Highway
36.1 mi · 43 min · North Valley Highway
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10
Take the exit slight right toward Wilcox Street, Wolfensberger Road
1213 ft · 32 sec
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11
Turn left onto East Wolfensberger Road
132 m · 21 sec · East Wolfensberger Road
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12
Continue on North Wilcox Street
2093 ft · 1 min · North Wilcox Street
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13
Turn left onto 5th Street
979 ft · 37 sec · 5th Street
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14
Turn right onto North Cantril Street
837 ft · 29 sec · North Cantril Street
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15
Arrive at your destination
0 m · 1 sec · North Cantril Street
Car Route Details
A richer read on the saved driving route between Milliken and Castle Rock.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
North Valley Highway
Keep slight right to continue on North Valley Highway
36.1 mi · 00h 43m
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.
Light Rain Likely leaving Milliken and Chance Rain And Snow Showers near Castle Rock.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Milliken to Castle Rock?
The road trip is about 83 miles (133.5 km) and usually takes 01h 25m 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?
Thornton is a useful midpoint, sitting about 39 miles from Milliken and 44 miles from Castle Rock.
How much longer is the road route than the straight-line distance?
The direct path is about 66.1 miles (106.4 km), while the road route adds roughly 16.9 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 8:00 AM to 10:00 AM MDT. If you want a more comfortable same-day return, try to leave by 3:40 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $12.67 one way or $25.34 round trip. Estimated CO2 is about 26 kg one way.
What should you check before leaving?
Before you leave, expect Light Rain Likely around Milliken and Chance Rain And Snow Showers near Castle Rock.
Stop Ideas Near Thornton
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Fairplay Park
Denver City Council
Lafayette City Hall
Municipal Court Park
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Thornton.
Denver (Bus Station), Colorado
Union Station
Boulder, Colorado
Longmont, Colorado
Flight Path Map
This map shows the direct air route between Milliken and Castle Rock. Straight-line distance: 66.14 mi (106.44 km).
#1 Milliken
City in Weld County, Colorado, United States of America
| Population | 8,688 |
| Coordinates | 40.3294300, -104.8552500 |
| Altitude | 1448 |
| Country | United States |
#2 Castle Rock
The most populous city in Douglas County, Colorado.
| Population | 70,567 |
| Coordinates | 39.3722100, -104.8560900 |
| Altitude | 1897 |
| Country | United States |
End: Cantril Street (-104.856315, 39.3722)
Estimated Travel Time
Distance: 134 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 45m |
| 40 mph (64.37 km/h) | 02h 04m |
| 50 mph (80.47 km/h) | 01h 39m |
| 60 mph (96.56 km/h) | 01h 22m |
| 70 mph (112.65 km/h) | 01h 11m |
| 80 mph (129 km/h) | 01h 02m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.33 | $12.67 | $25.34 |
| Mid-grade | $4.72 | $13.83 | $27.65 |
| Premium | $5.06 | $14.83 | $29.67 |
| Diesel | $6.52 | $19.09 | $38.19 |
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 · Oct 15, 2026