Castle Rock Internet Providers
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Quantum Fiber is available in Castle Rock. Get speeds up to 8 Gig • Sponsored Quantum Fiber is available in Castle Rock. Get speeds up to 8 Gig. Check availability on Quantum Fiber's Website ↗  Sponsored

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    Internet Providers in Castle Rock

    Castle Rock has multiple fiber providers, including Quantum Fiber and CenturyLink. Symmetric speeds of 8,000 Mbps are available in parts of Castle Rock.

    Residential Business

    Fiber

    Provider DownDownload (Mbps) UpUpload (Mbps) AvailabilityCoverage
    Quantum Fiber 8,000 8,000 51%
    Xfinity 2,000 2,000 13%
    CenturyLink 2,000 1,000 38%

    Cable

    Provider DownDownload (Mbps) UpUpload (Mbps) AvailabilityCoverage
    Xfinity 2,000 250 99%

    DSL

    Provider DownDownload (Mbps) UpUpload (Mbps) AvailabilityCoverage
    CenturyLink 140 100 99%

    Fixed Wireless

    Provider DownDownload (Mbps) UpUpload (Mbps) AvailabilityCoverage
    Kellin Communications 1,000 220 100%
    BAM 1,000 100 93%
    Xtream Internet 300 100 100%
    Verizon 300 20 99%
    Aerux 100 100 78%
    T-Mobile 100 20 99%
    AT&T 100 20 98%
    MINTernet 100 20 59%
    Rise 50 10 8%
    Thrive 40 5 27%

    Next-Gen Satellite

    Provider DownDownload (Mbps) UpUpload (Mbps) AvailabilityCoverage
    Starlink 280 30 100%

    Old-School Satellite

    Provider DownDownload (Mbps) UpUpload (Mbps) AvailabilityCoverage
    Viasat 150 3 100%
    HughesNet 50 5 100%

    Low-Availability Internet Options

    Provider TechnologyTech Download (Mbps) Upload (Mbps) AvailabilityCoverage
    Aerux Fiber 10,000 10,000 2%
    Thrive Fiber 2,000 2,000 <0.1%
    Visionary Fixed WirelessFixed Wireless 200 20 3%

    Broadband Map's availability estimates are based on the census boundaries of Castle Rock. Speed metrics capture internet providers' maximum advertised speeds. Both may be overoptimistic.

    Data Sourcing

    Broadband Map's listings of internet providers in Castle Rock rely primarily on the May 2026 release from the FCC's Broadband Data Collection program (representing Castle Rock ISPs' availability as of December 2025).