How far is Longmont, CO from Aspen, CO?
The driving distance from Longmont, CO to Aspen, CO is about 184 miles (296.1 km), with a travel time of about 04h 41m by car.
- The straight-line flight distance is about 113.5 miles (182.6 km).
- For a round trip, plan for roughly 09h 23m 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 41m.
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 Colorado, USA
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Longmont and Aspen.
Turn-by-Turn Driving Directions
Step-by-step road directions between Longmont and Aspen.
-
1
Start on the route
19 m · 10 sec
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2
Turn left onto 5th Avenue
53 m · 10 sec · 5th Avenue
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3
Turn left onto Main Street
17.3 mi · 25 min · Main Street
-
4
Continue straight
2797 ft · 1 min
-
5
Turn left onto US 36 East: Denver
1737 ft · 44 sec
-
6
Merge slight left onto Denver–Boulder Turnpike
1.2 mi · 1 min · Denver–Boulder Turnpike
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7
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
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8
Keep slight right to continue on Denver–Boulder Turnpike
1.2 km · 53 sec · Denver–Boulder Turnpike
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9
Take the exit slight right toward CO 95 South: Sheridan Boulevard
1708 ft · 37 sec
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10
Turn right onto Sheridan Boulevard
4.3 mi · 7 min · Sheridan Boulevard
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11
Take the ramp slight right toward I 76 West
1712 ft · 44 sec
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12
Merge slight left onto Heartland Expressway
1.3 mi · 2 min · Heartland Expressway
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13
Merge slight left
73.3 mi · 1 hr 29 min
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14
Take the exit slight right toward CO 91 South: Copper Mountain, Leadville
2195 ft · 42 sec
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15
Continue straight
22.1 mi · 28 min
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16
Continue straight
1.6 km · 2 min
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17
At the end of the road, turn right onto East 9th Street
599 ft · 21 sec · East 9th Street
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18
Turn slight left onto Harrison Avenue
916 ft · 37 sec · Harrison Avenue
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19
Turn right onto West 6th Street
1.3 km · 2 min · West 6th Street
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20
Turn left onto McWethy Drive
2541 ft · 52 sec · McWethy Drive
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21
Turn right
13.9 mi · 18 min
-
22
Turn right
42.9 mi · 1 hr 37 min
-
23
Turn right onto South Original Street
753 ft · 26 sec · South Original Street
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24
Continue on East Main Street
1095 ft · 41 sec · East Main Street
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25
Turn right onto North Galena Street
45 m · 7 sec · North Galena Street
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26
Turn left
17 m · 2 sec
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27
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Longmont and Aspen.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Heartland Expressway
Merge slight left
73.3 mi · 01h 29m
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.
Sunny leaving Longmont and Sunny near Aspen.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Longmont to Aspen?
The road trip is about 184 miles (296.1 km) and usually takes 04h 41m 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?
Silverthorne is a useful midpoint, sitting about 92 miles from Longmont and 92 miles from Aspen.
How much longer is the road route than the straight-line distance?
The direct path is about 113.5 miles (182.6 km), while the road route adds roughly 70.5 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 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 7:36 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $24.00 one way or $48.00 round trip. Estimated CO2 is about 57.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Longmont and Sunny near Aspen.
Stop Ideas Near Silverthorne
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 Silverthorne.
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Flight Path Map
This map shows the direct air route between Longmont and Aspen. Straight-line distance: 113.45 mi (182.58 km).
#1 Longmont
The most populous city in Boulder County, Colorado.
| Population | 98,445 |
| Coordinates | 40.1672100, -105.1019300 |
| Altitude | 1519 |
| 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: 296 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 07m |
| 40 mph (64.37 km/h) | 04h 35m |
| 50 mph (80.47 km/h) | 03h 40m |
| 60 mph (96.56 km/h) | 03h 03m |
| 70 mph (112.65 km/h) | 02h 37m |
| 80 mph (129 km/h) | 02h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $24.00 | $48.00 |
| Mid-grade | $4.08 | $26.51 | $53.01 |
| Premium | $4.39 | $28.50 | $57.00 |
| Diesel | $4.74 | $30.74 | $61.49 |
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.