Boulder and Longmont are separated by a distance of approximately 13.8 mi in a straight line.
See also the distance Boulder, CO to Longmont, CO calculated for a road trip (by car) , calculated for a bike ride , walk or public transport (bus, Metro, Train, Tram).
You also have the travel duration from Boulder top Longmont and the cost of fuel (gasoline or diesel) to cover the distance between Boulder and Longmont.
Distance (by car) between Boulder and Longmont : .
Travel duration : .
Cost Fuel (Diesel): .
Cost Fuel (Petrol) : .
How to go to Boulder by bus from any cities or places ? What is the best route from Longmont to Boulder ? If you just wondering how far is Boulder from Longmont ? You can find answers at these questions on this page and even more information like duration of the trip, the shorter and faster routes. Below, you have links to rent a car in Boulder or Longmont if needed.

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| - | Boulder | Longmont |
|---|---|---|
| State | Colorado | Colorado |
| Population | 107,349 Habitants | 92,088 inhabitants |
| Average altitude | 1630 m | 1520 m |
| Longitude | -105.2705500 | -105.1019300 |
| Latitude | 40.0149900 | 40.1672100 |
| Distance in straight line | 13.8 mi | |
| Distance by car | ||
| Travel duration (by car) | ||
| Distance by bike | ||
| Travel duration (by bike) | ||
Alternates names : Bolder, Boulder, Bouldur, WBU, ba'uldara, bo de, boldara, bolde xr, boldeo, boruda, bwldr, bwldr klradw, Болдер, Боулдер, Боулдър, בולדר, بولدر, بولدر، کلرادو, بولڈر، کولوراڈو, बाउल्डर, बोल्डर, โบลเดอร์, ボルダー, 波德, 볼더
| Cities | Population | Distance from Longmont, CO |
|---|---|---|
| Boulder, CO | 107,349 inhabitants | 0 km |
| Gunbarrel, CO | 9,263 inhabitants | 10 km |
| Niwot, CO | 4,006 inhabitants | 13 km |