How far is Trinidad, CO from Boulder, CO?
The driving distance from Trinidad, CO to Boulder, CO is about 225.8 miles (363.4 km), with a travel time of about 03h 34m by car.
- The straight-line flight distance is about 201 miles (323.4 km).
- For a round trip, plan for roughly 07h 08m 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 34m.
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.
City in Colorado, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Trinidad and Boulder.
Turn-by-Turn Driving Directions
Step-by-step road directions between Trinidad and Boulder.
-
1
Start on South Ash Street
91 m · 19 sec · South Ash Street
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2
Turn left onto East Main Street
1454 ft · 42 sec · East Main Street
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3
Turn right onto North Commercial Street
1831 ft · 37 sec · North Commercial Street
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4
Take the ramp right toward I 25 North
1265 ft · 31 sec
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5
Merge slight left
125.2 mi · 2 hr 8 min
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6
Continue on Monument Valley Freeway
8.5 mi · 10 min · Monument Valley Freeway
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7
Continue on Ronald Reagan Highway
68.6 mi · 1 hr 16 min · Ronald Reagan Highway
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8
Take the exit slight left toward US 36 West: Westminster, Boulder
2930 ft · 52 sec
-
9
Merge slight right onto Denver–Boulder Turnpike
2.1 mi · 2 min · Denver–Boulder Turnpike
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10
Keep slight right to continue on Denver–Boulder Turnpike
1.7 mi · 2 min · Denver–Boulder Turnpike
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11
Keep slight right to continue on Denver–Boulder Turnpike
2.3 mi · 3 min · Denver–Boulder Turnpike
-
12
Keep slight right to continue on Denver–Boulder Turnpike
1.9 mi · 2 min · Denver–Boulder Turnpike
-
13
Keep slight right to continue on Denver–Boulder Turnpike
2.1 mi · 2 min · Denver–Boulder Turnpike
-
14
Keep slight right to continue on Denver–Boulder Turnpike
2.9 mi · 3 min · Denver–Boulder Turnpike
-
15
Keep slight right to continue on Denver–Boulder Turnpike
2.4 mi · 3 min · Denver–Boulder Turnpike
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16
Keep slight right to continue on Denver–Boulder Turnpike
2.2 mi · 3 min · Denver–Boulder Turnpike
-
17
Keep slight left to continue on Denver–Boulder Turnpike
2.3 mi · 3 min · Denver–Boulder Turnpike
-
18
Continue on 28th Street
1.2 km · 2 min · 28th Street
-
19
Turn left onto Arapahoe Avenue
1 km · 2 min · Arapahoe Avenue
-
20
Turn right onto 19th Street
44 m · 11 sec · 19th Street
-
21
Turn left
27 m · 5 sec
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22
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Trinidad 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.
I 25 North
Merge slight left
125 mi · 02h 08m
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 Trinidad 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 Trinidad to Boulder?
The road trip is about 225.8 miles (363.4 km) and usually takes 03h 34m 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?
Fountain is a useful midpoint, sitting about 112.6 miles from Trinidad and 113.2 miles from Boulder.
How much longer is the road route than the straight-line distance?
The direct path is about 201 miles (323.4 km), while the road route adds roughly 24.8 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 9:52 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $29.47 one way or $58.95 round trip. Estimated CO2 is about 70.8 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Trinidad and Mostly Sunny near Boulder.
Stop Ideas Near Fountain
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 Fountain.
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Flight Path Map
This map shows the direct air route between Trinidad and Boulder. Straight-line distance: 200.95 mi (323.4 km).
#1 Trinidad
Home Rule Municipality in Las Animas County, Colorado, United States
| Population | 8,127 |
| Coordinates | 37.1694600, -104.5005400 |
| Altitude | 1839 |
| 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: 363 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 31m |
| 40 mph (64.37 km/h) | 05h 38m |
| 50 mph (80.47 km/h) | 04h 30m |
| 60 mph (96.56 km/h) | 03h 45m |
| 70 mph (112.65 km/h) | 03h 13m |
| 80 mph (129 km/h) | 02h 49m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $29.47 | $58.95 |
| Mid-grade | $4.08 | $32.55 | $65.10 |
| Premium | $4.39 | $35.00 | $69.99 |
| Diesel | $4.74 | $37.75 | $75.51 |
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 16, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.