How far is Castle Pines, CO from Longmont, CO?
The driving distance from Castle Pines, CO to Longmont, CO is about 74.7 miles (120.2 km), with a travel time of about 01h 14m by car.
- The straight-line flight distance is about 50.2 miles (80.8 km).
- For a round trip, plan for roughly 02h 29m 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 14m.
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 Freeborn County, Minnesota, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny then Slight Chance Rain Showers
Mostly Sunny then Slight Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Castle Pines and Longmont.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Pines and Longmont.
-
1
Start on Country Club Parkway
86 m · 13 sec · Country Club Parkway
-
2
Continue on Country Club Drive
146 m · 25 sec · Country Club Drive
-
3
Turn left onto Lagae Road
1160 ft · 51 sec · Lagae Road
-
4
Turn slight right onto Chase Lane
1.2 km · 3 min · Chase Lane
-
5
Turn right onto Lagae Road
1816 ft · 50 sec · Lagae Road
-
6
Enter the roundabout and take exit 2 toward East Happy Canyon Road
96 m · 6 sec · East Happy Canyon Road
-
7
Exit the roundabout onto East Happy Canyon Road
872 ft · 23 sec · East Happy Canyon Road
-
8
Take the ramp left toward I 25 North
1968 ft · 50 sec
-
9
Merge slight left
30.8 mi · 38 min
-
10
Keep slight right to continue on North Valley Highway
4.3 mi · 6 min · North Valley Highway
-
11
Keep slight right to continue on North Valley Highway
5.3 mi · 6 min · North Valley Highway
-
12
Continue on Dwight D. Eisenhower Highway
12.2 mi · 12 min · Dwight D. Eisenhower Highway
-
13
Take the exit slight right toward CO 119 West: Firestone Boulevard
996 ft · 19 sec
-
14
Keep slight left to continue on CO 119 West: Longmont
88 m · 8 sec
-
15
Turn left onto Highway 119
3.1 mi · 4 min · Highway 119
-
16
Continue on East Ken Pratt Boulevard
1.6 mi · 2 min · East Ken Pratt Boulevard
-
17
Take the exit slight right
69 m · 7 sec
-
18
Turn right onto East 3rd Avenue
1.9 mi · 4 min · East 3rd Avenue
-
19
Turn right onto Kimbark Street
1084 ft · 55 sec · Kimbark Street
-
20
Turn left
57 m · 16 sec
-
21
Turn right
33 m · 8 sec
-
22
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Castle Pines and Longmont.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 25 North
Merge slight left
30.8 mi · 00h 38m
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.
Mostly Sunny then Slight Chance Rain Showers leaving Castle Pines and Mostly Sunny then Slight Chance Rain Showers near Longmont.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Castle Pines to Longmont?
The road trip is about 74.7 miles (120.2 km) and usually takes 01h 14m 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?
Twin Lakes is a useful midpoint, sitting about 30.9 miles from Castle Pines and 43.8 miles from Longmont.
How much longer is the road route than the straight-line distance?
The direct path is about 50.2 miles (80.8 km), while the road route adds roughly 24.5 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 4:00 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $9.76 one way or $19.53 round trip. Estimated CO2 is about 23.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Slight Chance Rain Showers around Castle Pines and Mostly Sunny then Slight Chance Rain Showers near Longmont.
Stop Ideas Near Twin Lakes
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Fairplay Park
Denver City Council
Town Hall Arts Center
Municipal Court Park
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Twin Lakes.
Denver (Bus Station), Colorado
Union Station
Boulder, Colorado
Longmont, Colorado
Flight Path Map
This map shows the direct air route between Castle Pines and Longmont. Straight-line distance: 50.2 mi (80.79 km).
#1 Castle Pines
City in Douglas County, Colorado, United States of America
| Population | 11,664 |
| Coordinates | 39.4580400, -104.8960900 |
| Altitude | 1999 |
| Country | United States |
#2 Longmont
The most populous city in Boulder County, Colorado.
| Population | 98,445 |
| Coordinates | 40.1672100, -105.1019300 |
| Altitude | 1519 |
| Country | United States |
End: (-105.101861, 40.16721)
Estimated Travel Time
Distance: 120 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 29m |
| 40 mph (64.37 km/h) | 01h 52m |
| 50 mph (80.47 km/h) | 01h 29m |
| 60 mph (96.56 km/h) | 01h 14m |
| 70 mph (112.65 km/h) | 01h 04m |
| 80 mph (129 km/h) | 00h 55m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $9.76 | $19.53 |
| Mid-grade | $4.08 | $10.78 | $21.56 |
| Premium | $4.39 | $11.59 | $23.18 |
| Diesel | $4.74 | $12.51 | $25.01 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.