How far is Boulder, CO from Aspen, CO?
The driving distance from Boulder, CO to Aspen, CO is about 170.3 miles (274.1 km), with a travel time of about 04h 27m by car.
- The straight-line flight distance is about 100.1 miles (161.1 km).
- For a round trip, plan for roughly 08h 55m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 04h 27m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
Town in Summit County, Colorado, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Snow Showers
Snow Showers
Driving Route Map
The map below follows the saved road route between Boulder and Aspen.
Turn-by-Turn Driving Directions
Step-by-step road directions between Boulder and Aspen.
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1
Start on the route
27 m · 7 sec
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2
Turn right onto 19th Street
44 m · 14 sec · 19th Street
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3
Turn left onto Arapahoe Avenue
3210 ft · 2 min · Arapahoe Avenue
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4
Turn right onto 28th Street
1.2 km · 2 min · 28th Street
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5
Turn straight onto Baseline Road
865 ft · 18 sec
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6
Keep slight left to continue on Baseline Road, Broadway South
116 m · 16 sec
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7
Continue on 27th Way
1484 ft · 46 sec · 27th Way
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8
At the end of the road, turn left onto Broadway
2.2 mi · 4 min · Broadway
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9
Continue on South Foothills Highway
8.3 mi · 12 min · South Foothills Highway
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10
Continue straight
7.5 mi · 11 min
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11
Continue on Dinosaur Diamond Prehistoric Highway
2.9 mi · 5 min · Dinosaur Diamond Prehistoric Highway
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12
Turn right
2993 ft · 54 sec
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13
Take the exit slight right toward I 70 West: Grand Junction
1.3 km · 59 sec
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14
Merge slight left
63.9 mi · 1 hr 18 min
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15
Take the exit slight right toward CO 91 South: Copper Mountain, Leadville
2195 ft · 42 sec
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16
Continue straight
22.1 mi · 28 min
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17
Continue straight
1.6 km · 2 min
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18
At the end of the road, turn right onto East 9th Street
599 ft · 21 sec · East 9th Street
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19
Turn slight left onto Harrison Avenue
916 ft · 37 sec · Harrison Avenue
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20
Turn right onto West 6th Street
1.3 km · 2 min · West 6th Street
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21
Turn left onto McWethy Drive
2541 ft · 52 sec · McWethy Drive
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22
Turn right
13.9 mi · 18 min
-
23
Turn right
42.9 mi · 1 hr 37 min
-
24
Turn right onto South Original Street
753 ft · 26 sec · South Original Street
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25
Continue on East Main Street
1095 ft · 41 sec · East Main Street
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26
Turn right onto North Galena Street
45 m · 7 sec · North Galena Street
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27
Turn left
17 m · 2 sec
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28
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Boulder and Aspen.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
I 70 West
Merge slight left
63.9 mi · 01h 18m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Snow Showers leaving Boulder and Snow Showers near Aspen.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Boulder to Aspen?
The road trip is about 170.3 miles (274.1 km) and usually takes 04h 27m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Frisco is a useful midpoint, sitting about 85.1 miles from Boulder and 85.3 miles from Aspen.
How much longer is the road route than the straight-line distance?
The direct path is about 100.1 miles (161.1 km), while the road route adds roughly 70.2 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 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 8:04 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $22.22 one way or $44.45 round trip. Estimated CO2 is about 53.4 kg one way.
What should you check before leaving?
Before you leave, expect Snow Showers around Boulder and Snow Showers near Aspen.
Stop Ideas Near Frisco
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 Frisco.
Frisco, Colorado
Vail, Colorado
Fairplay, CO
Fraser – Winter Park
Flight Path Map
This map shows the direct air route between Boulder and Aspen. Straight-line distance: 100.11 mi (161.11 km).
#1 Boulder
The most populous city in Boulder County, Colorado.
| Population | 107,645 |
| Coordinates | 40.0149900, -105.2705500 |
| Altitude | 1624 |
| Country | United States |
#2 Aspen
Town in Pitkin County, Colorado, USA
| Population | 7,657 |
| Coordinates | 39.1911000, -106.8175400 |
| Altitude | 2405 |
| Country | United States |
End: Aspen (-106.81754, 39.1911)
Estimated Travel Time
Distance: 274 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 40m |
| 40 mph (64.37 km/h) | 04h 15m |
| 50 mph (80.47 km/h) | 03h 24m |
| 60 mph (96.56 km/h) | 02h 50m |
| 70 mph (112.65 km/h) | 02h 26m |
| 80 mph (129 km/h) | 02h 07m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $22.22 | $44.45 |
| Mid-grade | $4.08 | $24.54 | $49.09 |
| Premium | $4.39 | $26.39 | $52.78 |
| Diesel | $4.74 | $28.47 | $56.94 |
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 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.