How far is Lone Tree, CO from Boulder, CO?
The driving distance from Lone Tree, CO to Boulder, CO is about 45.2 miles (72.8 km), with a travel time of about 00h 51m by car.
- The straight-line flight distance is about 38 miles (61.1 km).
- For a round trip, plan for roughly 01h 42m 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 00h 51m.
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
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Lone Tree and Boulder.
Turn-by-Turn Driving Directions
Step-by-step road directions between Lone Tree and Boulder.
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1
Start on the route
139 m · 22 sec
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2
Turn left onto South Yosemite Street
1.4 km · 2 min · South Yosemite Street
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3
Turn right onto Chester Street
1016 ft · 32 sec · Chester Street
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4
Turn right onto East County Line Road
2278 ft · 47 sec · East County Line Road
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5
Take the ramp slight right toward I 25 North
3070 ft · 1 min
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6
Merge slight left onto South Valley Highway
21.2 mi · 27 min · South Valley Highway
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7
Take the exit slight left toward US 36 West: Westminster, Boulder
2930 ft · 52 sec
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8
Merge slight right onto Denver–Boulder Turnpike
2.1 mi · 2 min · Denver–Boulder Turnpike
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9
Keep slight right to continue on Denver–Boulder Turnpike
1.7 mi · 2 min · Denver–Boulder Turnpike
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10
Keep slight right to continue on Denver–Boulder Turnpike
2.3 mi · 3 min · Denver–Boulder Turnpike
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11
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
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12
Keep slight right to continue on Denver–Boulder Turnpike
2.1 mi · 2 min · Denver–Boulder Turnpike
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13
Keep slight right to continue on Denver–Boulder Turnpike
2.9 mi · 3 min · Denver–Boulder Turnpike
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14
Keep slight right to continue on Denver–Boulder Turnpike
2.4 mi · 3 min · Denver–Boulder Turnpike
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15
Keep slight right to continue on Denver–Boulder Turnpike
2.2 mi · 3 min · Denver–Boulder Turnpike
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16
Keep slight left to continue on Denver–Boulder Turnpike
2.3 mi · 3 min · Denver–Boulder Turnpike
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17
Continue on 28th Street
1.2 km · 2 min · 28th Street
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18
Turn left onto Arapahoe Avenue
1 km · 2 min · Arapahoe Avenue
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19
Turn right onto 19th Street
44 m · 11 sec · 19th Street
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20
Turn left
27 m · 5 sec
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21
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Lone Tree and Boulder.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
South Valley Highway
Merge slight left onto South Valley Highway
21.2 mi · 00h 27m
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 leaving Lone Tree and Mostly Sunny near Boulder.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Lone Tree to Boulder?
The road trip is about 45.2 miles (72.8 km) and usually takes 00h 51m 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 22.6 miles from Lone Tree and 22.7 miles from Boulder.
How much longer is the road route than the straight-line distance?
The direct path is about 38 miles (61.1 km), while the road route adds roughly 7.2 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 4:48 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.92 one way or $11.83 round trip. Estimated CO2 is about 14.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Lone Tree and Mostly Sunny near Boulder.
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 Lone Tree and Boulder. Straight-line distance: 37.96 mi (61.09 km).
#1 Lone Tree
City in Douglas County, Colorado, United States of America
| Population | 13,614 |
| Coordinates | 39.5517100, -104.8863000 |
| Altitude | 1813 |
| Country | United States |
#2 Boulder
The most populous city in Boulder County, Colorado.
| Population | 107,645 |
| Coordinates | 40.0149900, -105.2705500 |
| Altitude | 1624 |
| Country | United States |
End: (-105.27055, 40.014996)
Estimated Travel Time
Distance: 73 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 30m |
| 40 mph (64.37 km/h) | 01h 07m |
| 50 mph (80.47 km/h) | 00h 54m |
| 60 mph (96.56 km/h) | 00h 45m |
| 70 mph (112.65 km/h) | 00h 38m |
| 80 mph (129 km/h) | 00h 33m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $5.92 | $11.83 |
| Mid-grade | $4.08 | $6.53 | $13.07 |
| Premium | $4.39 | $7.03 | $14.05 |
| Diesel | $4.74 | $7.58 | $15.16 |
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.