How far is Aspen, CO from Longmont, CO?
The driving distance from Aspen, CO to Longmont, CO is about 192.1 miles (309.1 km), with a travel time of about 04h 00m by car.
- The straight-line flight distance is about 113.5 miles (182.6 km).
- For a round trip, plan for roughly 08h 00m 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 00m.
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.
Chance Snow Showers
Mostly Sunny then Slight Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Aspen and Longmont.
Turn-by-Turn Driving Directions
Step-by-step road directions between Aspen and Longmont.
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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
73.4 mi · 1 hr 29 min
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17
Keep slight left to continue on Heartland Expressway
1.3 mi · 2 min · Heartland Expressway
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18
Take the exit slight right toward CO 95: Sheridan Boulevard
1606 ft · 40 sec
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19
Turn left onto Sheridan Boulevard
4.6 mi · 8 min · Sheridan Boulevard
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20
Turn left onto US 36 West: Boulder
1765 ft · 37 sec
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21
Keep slight left to continue on US 36 West
876 ft · 23 sec
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22
Merge slight left onto Denver–Boulder Turnpike
1.5 km · 1 min · Denver–Boulder Turnpike
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23
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
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24
Keep slight right to continue on Denver–Boulder Turnpike
1.2 km · 52 sec · Denver–Boulder Turnpike
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25
Take the exit slight right toward CO 121: Wadsworth Parkway
1951 ft · 42 sec
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26
Turn right
1257 ft · 30 sec
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27
Continue straight
5.7 mi · 8 min
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28
Continue straight
1106 ft · 19 sec
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29
Continue straight
11.5 mi · 16 min
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30
Turn right onto 5th Avenue
109 m · 20 sec · 5th Avenue
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31
Turn right onto Kimbark Street
52 m · 9 sec · Kimbark Street
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32
Turn right
57 m · 16 sec
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33
Turn right
33 m · 8 sec
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34
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Aspen and Longmont.
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
73.4 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.
Chance Snow Showers leaving Aspen 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 Aspen to Longmont?
The road trip is about 192.1 miles (309.1 km) and usually takes 04h 00m 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 91.9 miles from Aspen and 100.2 miles from Longmont.
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 78.6 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 9:00 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $25.07 one way or $50.14 round trip. Estimated CO2 is about 60.3 kg one way.
What should you check before leaving?
Before you leave, expect Chance Snow Showers around Aspen and Mostly Sunny then Slight Chance Rain Showers near Longmont.
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 Aspen and Longmont. Straight-line distance: 113.45 mi (182.58 km).
#1 Aspen
Town in Pitkin County, Colorado, USA
| Population | 7,657 |
| Coordinates | 39.1911000, -106.8175400 |
| Altitude | 2405 |
| 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: 309 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 23m |
| 40 mph (64.37 km/h) | 04h 48m |
| 50 mph (80.47 km/h) | 03h 50m |
| 60 mph (96.56 km/h) | 03h 12m |
| 70 mph (112.65 km/h) | 02h 44m |
| 80 mph (129 km/h) | 02h 23m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $25.07 | $50.14 |
| Mid-grade | $4.08 | $27.69 | $55.38 |
| Premium | $4.39 | $29.77 | $59.54 |
| Diesel | $4.74 | $32.12 | $64.23 |
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.