How far is Castle Rock, CO from Fort Collins, CO?
The driving distance from Castle Rock, CO to Fort Collins, CO is about 106.1 miles (170.7 km), with a travel time of about 01h 37m by car.
- The straight-line flight distance is about 84.7 miles (136.3 km).
- For a round trip, plan for roughly 03h 15m 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 37m.
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 Colorado
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Castle Rock and Fort Collins.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Rock and Fort Collins.
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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
35.9 mi · 43 min
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7
Keep slight right to continue on North Valley Highway
4.3 mi · 6 min · North Valley Highway
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8
Keep slight right to continue on North Valley Highway
5.3 mi · 6 min · North Valley Highway
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9
Continue on Dwight D. Eisenhower Highway
41.7 mi · 42 min · Dwight D. Eisenhower Highway
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10
Take the exit slight right toward CO 14 West: Fort Collins
976 ft · 23 sec
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11
Merge slight left onto East Mulberry Street
4 mi · 7 min · East Mulberry Street
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12
Continue on West Mulberry Street
1543 ft · 49 sec · West Mulberry Street
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13
Turn right onto South Meldrum Street
152 m · 27 sec · South Meldrum Street
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14
Turn left onto West Magnolia Street
145 m · 16 sec · West Magnolia Street
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15
Continue on South Sherwood Street
841 ft · 37 sec · South Sherwood Street
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16
Arrive at your destination
0 m · 1 sec · South Sherwood Street
Car Route Details
A richer read on the saved driving route between Castle Rock and Fort Collins.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Dwight D. Eisenhower Highway
Continue on Dwight D. Eisenhower Highway
41.7 mi · 00h 42m
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 then Slight Chance Showers And Thunderstorms leaving Castle Rock and Mostly Sunny then Slight Chance Showers And Thunderstorms near Fort Collins.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Castle Rock to Fort Collins?
The road trip is about 106.1 miles (170.7 km) and usually takes 01h 37m 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?
Lafayette is a useful midpoint, sitting about 46.5 miles from Castle Rock and 59.5 miles from Fort Collins.
How much longer is the road route than the straight-line distance?
The direct path is about 84.7 miles (136.3 km), while the road route adds roughly 21.4 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 3:14 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $13.83 one way or $27.66 round trip. Estimated CO2 is about 33.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny then Slight Chance Showers And Thunderstorms around Castle Rock and Mostly Sunny then Slight Chance Showers And Thunderstorms near Fort Collins.
Stop Ideas Near Lafayette
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Municipal Court Park
Broomfield City Council
Lafayette City Hall
Historic Brighton City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Lafayette.
Boulder, Colorado
Longmont, Colorado
Denver (Bus Station), Colorado
Union Station
Flight Path Map
This map shows the direct air route between Castle Rock and Fort Collins. Straight-line distance: 84.68 mi (136.28 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 Fort Collins
The fifth most populous city in Colorado.
| Population | 168,234 |
| Coordinates | 40.5852600, -105.0844200 |
| Altitude | 1525 |
| Country | United States |
End: South Sherwood Street (-105.08428, 40.58526)
Estimated Travel Time
Distance: 171 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 32m |
| 40 mph (64.37 km/h) | 02h 39m |
| 50 mph (80.47 km/h) | 02h 07m |
| 60 mph (96.56 km/h) | 01h 46m |
| 70 mph (112.65 km/h) | 01h 30m |
| 80 mph (129 km/h) | 01h 19m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $13.83 | $27.66 |
| Mid-grade | $4.08 | $15.27 | $30.55 |
| Premium | $4.39 | $16.42 | $32.84 |
| Diesel | $4.74 | $17.72 | $35.43 |
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 · May 30, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.