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 170 Mbps and an average upload speed of 16 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 May 22, 2023
ProviderDownload SpeedUpload SpeedLatency
View Details →
170 Mbps16 Mbps8 ms
View Details →
86 Mbps45 Mbps7 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 170 Mbps for download speeds and 16 Mbps for upload speeds over 27,500 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. 30% of users saw download speeds between 100-250 Mbps, and 48% of users saw upload speeds between 10-25 Mbps.

Download Speeds

Upload Speeds

Recent Xfinity Speed Tests in Boulder

DateDownload SpeedUpload SpeedLatency
May 20, 2023119 Mbps17 Mbps24 ms
May 20, 2023237 Mbps4 Mbps6 ms
May 20, 2023323 Mbps21 Mbpsn/a ms
May 20, 2023247 Mbps24 Mbpsn/a ms
May 20, 2023212 Mbps41 Mbpsn/a ms
May 20, 2023308 Mbps41 Mbpsn/a ms
May 20, 2023247 Mbps41 Mbpsn/a ms
May 20, 2023321 Mbps41 Mbpsn/a ms
May 20, 2023247 Mbps41 Mbpsn/a ms
May 20, 2023305 Mbps41 Mbps5 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.