How far is Aspen, CO from Boulder, CO?
The driving distance from Aspen, CO to Boulder, CO is about 170.7 miles (274.7 km), with a travel time of about 03h 45m by car.
- The straight-line flight distance is about 100.1 miles (161.1 km).
- For a round trip, plan for roughly 07h 31m 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 03h 45m.
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.
Partly Sunny then Isolated Showers And Thunderstorms
Mostly Sunny then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Aspen and Boulder.
Turn-by-Turn Driving Directions
Step-by-step road directions between Aspen and Boulder.
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1
Start on the route
73 m · 20 sec
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2
Turn left onto East Main Street
1095 ft · 38 sec · East Main Street
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3
Continue on South Original Street
753 ft · 31 sec · South Original Street
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4
Turn left onto East Cooper Avenue
42.9 mi · 1 hr 39 min · East Cooper Avenue
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5
At the end of the road, turn left
13.9 mi · 18 min
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6
Turn left onto McWethy Drive
2541 ft · 52 sec · McWethy Drive
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7
Turn right onto West 8th Street
55 m · 4 sec · West 8th Street
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8
Continue on West 6th Street
1.3 km · 2 min · West 6th Street
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9
At the end of the road, turn left onto Harrison Avenue
106 m · 16 sec · Harrison Avenue
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10
Turn right onto East 7th Street
646 ft · 23 sec · East 7th Street
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11
Turn left onto Poplar Street
589 ft · 27 sec · Poplar Street
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12
At the end of the road, turn left onto East 9th Street
11 m · 2 sec · East 9th Street
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13
Turn right onto Poplar Street
1.6 km · 2 min · Poplar Street
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14
Continue straight
22.1 mi · 28 min
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15
Take the exit slight right toward I 70 East
1738 ft · 33 sec
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16
Merge slight left
63.1 mi · 1 hr 17 min
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17
Take the exit slight right toward US 40, I 70 Business East, CH 93: Golden, Morrison
1173 ft · 24 sec
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18
Turn left onto Hogback Road
1123 ft · 35 sec · Hogback Road
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19
Continue on Lariat Loop Scenic Byway
1.1 mi · 2 min · Lariat Loop Scenic Byway
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20
Turn left onto Heritage Road
1415 ft · 29 sec · Heritage Road
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21
Enter the roundabout and take exit 1 toward Heritage Road
32 m · 2 sec · Heritage Road
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22
Exit the roundabout onto Heritage Road
149 m · 10 sec · Heritage Road
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23
Enter the roundabout and take exit 2 toward Heritage Road
15 m · 1 sec · Heritage Road
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24
Exit the roundabout onto Heritage Road
1356 ft · 27 sec · Heritage Road
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25
Enter the roundabout and take exit 2 toward Heritage Road
39 m · 3 sec · Heritage Road
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26
Exit the roundabout onto Heritage Road
707 ft · 16 sec · Heritage Road
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27
Turn slight right onto Heritage Road
809 ft · 20 sec · Heritage Road
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28
Turn left onto Dinosaur Diamond Prehistoric Highway
2.3 mi · 4 min · Dinosaur Diamond Prehistoric Highway
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29
Continue straight
7.5 mi · 11 min
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30
Continue straight
11.8 mi · 20 min
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31
Turn right onto University Avenue
1049 ft · 36 sec · University Avenue
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32
Continue on 17th Street
813 ft · 30 sec · 17th Street
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33
Turn right onto Athens Street
646 ft · 33 sec · Athens Street
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34
Turn left onto 19th Street
864 ft · 29 sec · 19th Street
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35
Turn left
27 m · 5 sec
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36
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Aspen and Boulder.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
I 70 East
Merge slight left
63.1 mi · 01h 17m
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.
Partly Sunny then Isolated Showers And Thunderstorms leaving Aspen and Mostly Sunny then Chance Showers And Thunderstorms near Boulder.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Aspen to Boulder?
The road trip is about 170.7 miles (274.7 km) and usually takes 03h 45m 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 miles from Aspen and 85.7 miles from Boulder.
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 70.6 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 9:28 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $22.26 one way or $44.52 round trip. Estimated CO2 is about 53.5 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny then Isolated Showers And Thunderstorms around Aspen and Mostly Sunny then Chance Showers And Thunderstorms near Boulder.
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 Aspen and Boulder. Straight-line distance: 100.11 mi (161.11 km).
#1 Aspen
Town in Pitkin County, Colorado, USA
| Population | 7,657 |
| Coordinates | 39.1911000, -106.8175400 |
| Altitude | 2405 |
| 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: 275 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 41m |
| 40 mph (64.37 km/h) | 04h 16m |
| 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 | $22.26 | $44.52 |
| Mid-grade | $4.08 | $24.59 | $49.17 |
| Premium | $4.39 | $26.43 | $52.87 |
| Diesel | $4.74 | $28.52 | $57.03 |
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 25, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.