Internet Speeds in Boulder, CO

In Boulder there are 2 internet service providers, with Xfinity being the most popular. Xfinity offers cable and fiber internet service. In recent tests, Xfinity customers had an average download speed of 186 Mbps and an average upload speed of 17 Mbps. In addition to Xfinity, DSL and fiber internet service is also available from CenturyLink.

While our research has shown these to be the real speeds that users experience, there are many factors that can affect the actual download and upload speeds you will encounter. These may include the type of internet connection you have, the distance between your device and the router, the number of users on the network, and the strength of the signal.

Last updated on February 24, 2024
ProviderDownload SpeedUpload SpeedLatency
View Details →
186 Mbps17 Mbps8 ms
View Details →
90 Mbps93 Mbps5 ms
* Data from speed tests taken in the last 3 months

Internet Providers in Boulder, CO



Download Speed


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Xfinity is the most popular provider in Boulder offering cable and fiber internet service. Users have been getting 186 Mbps for download speeds and 17 Mbps for upload speeds over 31,886 recent tests.

Performance Breakdown

Xfinity has the fastest average download speed, the 2nd fastest average upload speed, and the 2nd lowest latency out of all of the providers in Boulder. 28% of users saw download speeds between 250-500 Mbps, and 48% of users saw upload speeds between 10-25 Mbps.

Download Speeds

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Recent Xfinity Speed Tests in Boulder

DateDownload SpeedUpload SpeedLatency
February 23, 2024281 Mbps18 Mbps58 ms
February 23, 2024477 Mbps24 Mbps5 ms
February 23, 2024467 Mbps69 Mbps5 ms
February 23, 2024317 Mbps23 Mbps4 ms
February 23, 2024411 Mbps5 Mbps9 ms
February 23, 2024107 Mbps12 Mbps9 ms
February 23, 202436 Mbps6 Mbps7 ms
February 23, 202498 Mbps3 Mbps10 ms
February 23, 2024135 Mbps23 Mbps5 ms
February 23, 2024212 Mbps5 Mbps7 ms

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Frequently Asked Questions

What internet providers are available in Boulder, CO?

Xfinity and CenturyLink currently operate in Boulder.

What is the most popular internet provider in Boulder, CO?

Xfinity is currently the most popular internet provider in Boulder based on the number of speed tests in the last 3 months.

What is the fastest internet provider in Boulder, CO?

The fastest internet provider for you is going to differ based on your needs, and which providers actually serve your home. However, when it comes to the real speeds users in Boulder are getting, Xfinity provides the fastest download and upload speeds.

Is there fiber internet in Boulder, CO?

CenturyLink and Xfinity provide fiber internet in Boulder.