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I grew up just north of Boulder, Colorado, so I may be biased, but I consider it to be one of the country’s most unique and beautiful cities. From its stellar college football team, the Colorado Buffaloes, to its gorgeous trails and mountains, Boulder has a lot to offer. Beyond the sights and sports, it also stands out for the speed of its internet connections relative to the rest of the state.
If you live in Boulder (or plan to move there), you have a handful of options, but the two most widely available internet service providers are Xfinity and CenturyLink. CNET’s pick for the best overall internet service provider in Boulder is Xfinity because of its extensive coverage across the city and wide selection of plans. Other options include CenturyLink, which is widely available but limited to slower DSL plans, along with fiber from Quantum Fiber and 5G home internet from T-Mobile — and to a lesser extent, Verizon.
Best internet in Boulder in 2025
Boulder residents can expect median download speeds of approximately 328 megabits per second, according to Ookla Speedtest data — comparable to Colorado‘s statewide median (271Mbps) and the national median (263Mbps). (Ookla is owned by the same parent company as CNET, Ziff Davis.) Not too shabby.
T-Mobile Home Internet, which starts at $50 monthly, drops to $35 per month when you bundle an eligible cellphone plan, such as Go5G Plus and Magenta Max.
What’s the cheapest internet plan in Boulder?
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Source: CNET analysis of provider data.
Boulder broadband speeds
Just about all Boulder households have access to broadband internet speeds of 250Mbps down and 25Mbps upload. As we mentioned earlier, Boulder residents see much higher median download speeds than the rest of the state.
What are the fastest internet plans in Boulder?
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Source: CNET analysis of provider data.
How CNET chose the best internet providers in Boulder
Internet service providers are numerous and regional. Unlike the latest smartphone, laptop, router or kitchen tool, it’s impractical to personally test every ISP in a given city. So what’s our approach? For starters, we tap into a proprietary database of pricing, availability and speed information that draws from our own historical ISP data, partner data and mapping information from the Federal Communications Commission at FCC.gov.
This guide leverages an in-house artificial intelligence tool called RAMP, which is trained on our own writing and uses our database to generate content about specific internet service providers that our writers can use in determining and presenting our picks for a given guide. Check CNET’s AI policy for more information about how our teams use (and don’t use) AI tools.
Because our database isn’t exhaustive, we go to the FCC’s website to check the primary data for ourselves and make sure we’re considering every ISP that provides service in an area. Plans and prices also vary by location, so we input local addresses on provider websites to find the specific options available to residents. We look at sources, including the American Customer Satisfaction Index and J.D. Power, to evaluate how happy customers are with an ISP’s service. ISP plans and prices are subject to frequent changes; all information provided is accurate as of our prepublication fact-check.
Once we have this localized information, we ask three main questions:
Does the provider offer access to reasonably fast internet speeds?
Do customers get decent value for what they’re paying?
Are customers happy with their service?
While the answer to those questions is often layered and complex, the providers who come closest to “yes” on all three are the ones we recommend. To explore our process in more depth, visit our how we test ISPs page.
What’s the bottom line on internet providers in Boulder?
Xfinity covers nearly every address in the city and features the widest array of plan choices of any provider in the area. That’s why it gets our nod for the best ISP in the city. However, Boulder households have other viable options, including fiber plans from Quantum Fiber and a fixed wireless connection from T-Mobile Home Internet.
Internet providers in Boulder: FAQs
Which is the best internet service provider in Boulder?
Yes. Quantum Fiber offers four plans: the lowest at 200Mbps for $45 per month and the highest at 2,000Mbps for $95 monthly.
Which is the cheapest internet provider in Boulder?
Xfinity offers the fastest plan in Boulder with its 2,100Mbps plan. However, many addresses max out at 1,300Mbps through Xfinity, so the fastest option available will depend on where you live. Quantum Fiber offers a 2-gig plan for $95 per month, which is a close second and may be available at addresses that can’t access Xfinity’s fastest speeds.
