CenturyLink / Quantum Fiber in Boulder, CO — Plans and Pricing
CenturyLink (now Quantum Fiber) offers DSL and fiber internet in Boulder, CO. Compare plans, speeds, and pricing for Boulder addresses.
CenturyLink is Boulder's second major wired internet provider after Xfinity, serving much of the city with DSL and, in select areas, fiber. CenturyLink has been rebranding to Quantum Fiber in markets where it has deployed fiber infrastructure — Boulder is in various stages of that transition.
Plans Available in Boulder
| Plan | Technology | Speed | Price/mo | Contract |
|---|---|---|---|---|
| Simply Unlimited Internet | DSL | Up to 100 Mbps | ~$50 | None |
| Fiber Internet 200 | Fiber | 200 Mbps | ~$50 | None |
| Fiber Internet 500 | Fiber | 500 Mbps | ~$65 | None |
| Fiber Internet Gig | Fiber | 940 Mbps | ~$75 | None |
Availability and pricing vary by address. DSL speeds depend heavily on your distance from the nearest central office. Fiber plans are available only where Quantum Fiber infrastructure has been deployed.
CenturyLink vs. Quantum Fiber — What's the Difference?
They're the same company. Lumen Technologies (CenturyLink's parent) is rebranding the consumer business as Quantum Fiber in markets with fiber deployment. In Boulder you may see both names used — they use the same account portal and customer service.
Pros
- Often lower base pricing than Xfinity
- No annual contract on most plans
- Price-for-life guarantee available on some fiber plans (price doesn't increase after promo period)
- Fiber plans deliver symmetrical upload/download speeds
Cons
- DSL speeds are significantly lower than cable or fiber, especially farther from the central office
- Fiber availability is not universal across Boulder — check your address
- Customer service and outage response can be inconsistent
- Not available at all Boulder addresses (Xfinity has broader coverage)
Is Fiber Available at Your Address?
Quantum Fiber availability in Boulder depends on whether fiber has been laid to your specific street. Check availability before assuming fiber speeds — many Boulder addresses still receive DSL only.
Check availability at Quantum Fiber
Comparing Your Boulder Options
| Provider | Technology | Max Speed | Approx Price |
|---|---|---|---|
| Xfinity | Cable | 1,200 Mbps | $30–$90/mo |
| CenturyLink / Quantum Fiber | DSL / Fiber | 100–940 Mbps | $50–$75/mo |
| T-Mobile Home Internet | 5G/LTE | 33–300 Mbps | $50/mo |
| ALLO Communications | Fiber | Up to 1 Gbps | TBD (mid-2026) |
See also: T-Mobile Home Internet Boulder · Xfinity Boulder · ALLO Communications Boulder