In Castle Rock there are 3 residential Fiber providers covering 32.09% of the city. The average home can get speeds up to 1,983 Mbps. Note that we may have a financial relationship with some of the providers below. This does not influence rankings, and helps us provide high-quality detailed information for free.
This page contains all Fiber internet providers in Castle Rock, CO.
To see availability maps for all providers including fiber, cable, DSL, and more in Castle Rock, CO please click below.
Castle Rock, CO Availability Maps
Fiber Internet Service Providers in Castle Rock
Data updated 11/14/2025, based on FCC data from 12/31/2024. This is the most current data available as of .
To avoid wasting your time, providers with less than 1% coverage in Castle Rock are not shown.
Castle Rock Satellite TV & Internet Providers
DISH Satellite TV
DIRECTV Satellite TV
Not sure whether to choose Dish or DIRECTV? For most people most of the time we recommend DISH. But click here to learn more.
Viasat Satellite Internet
Where in Castle Rock is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 32.09% of Castle Rock. Areas in green have fiber internet service, where areas in yellow or red may not. The most widely available provider is Quantum Fiber. Call one of the companies with service in Castle Rock above to see who has service at your home.
How fast is fiber internet in Castle Rock?
The map below shows maximum fiber internet speeds by area in Castle Rock.
Fiber Internet Speed Key
The average Castle Rock home can get up to 1,983 Mbps on their fiber internet plan. The fastest fiber download speed in the city is 10,000 Mbps, which less than 1% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 4.22% of homes can only purchase plans up to 940 Mbps. See the internet provider details below for info about their speed and coverage in Castle Rock.
Fiber internet speeds tend to be faster in the southeast parts of Castle Rock, and slower in the northeast areas of the city.
Is fiber the fastest internet I can get in Castle Rock?
The fastest internet for you may vary based on where in Castle Rock you live. In general, cable competes most often with fiber in the city.
- Fiber is the fastest internet type for 25.66% of Castle Rock homes.
- Cable is fastest for 72.84% of the city.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 1.41%.
- Satellite internet may be the only option for less than 1% of Castle Rock homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in Castle Rock, along with details on where in Castle Rock and at what speeds.
Quantum Fiber Fiber in Castle Rock, CO
Quantum Fiber fiber coverage
About 30.28%, or 24,974 people, have Quantum Fiber fiber internet available to them in the city. The company covers the entire Castle Rock area. Quantum Fiber is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of Castle Rock.
Quantum Fiber fiber download speeds
Quantum Fiber is above average when comparing download speeds to all other internet providers in Castle Rock. Versus other fiber providers in the area, Quantum Fiber fiber is below average. There are 4 different maximum speeds throughout Castle Rock. The fastest plan anyone in Castle Rock can order from Quantum Fiber goes up to 8,000 Mbps, the slowest package only goes up to 940 Mbps, and the city-wide average maximum speed for Castle Rock customers is up to 1,992 Mbps.
Show all download speeds
- 4.2% up to 8,000.0 Mbps
- 71.3% up to 2,000.0 Mbps
- 2.2% up to 1,000.0 Mbps
- 22.4% up to 940.0 Mbps
Quantum Fiber fiber upload speeds
In Castle Rock download speeds tend to be faster than than upload speeds for Quantum Fiber fiber. Compared to other ISPs, Quantum Fiber is above average where upload speeds are concerned, and below average compared to other Castle Rock fiber providers. Quantum Fiber offers 3 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castle Rock is up to 8,000 Mbps. Some customers have slower plan choices, which only go up to 940 Mbps. On average, Quantum Fiber customers can get speeds up to 1,279 Mbps.
Show all upload speeds
- 4.2% up to 8,000.0 Mbps
- 73.5% up to 1,000.0 Mbps
- 22.4% up to 940.0 Mbps
Centurylink Fiber in Castle Rock, CO
Centurylink fiber coverage
About 27.07%, or 22,324 people, have Centurylink fiber internet available to them in the city. The company covers the entire Castle Rock area. Centurylink is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of Castle Rock.
Centurylink fiber download speeds
Centurylink is below average when comparing download speeds to all other internet providers in Castle Rock. Versus other fiber providers in the area, Centurylink fiber is the slowest. There are 4 different maximum speeds throughout Castle Rock. The fastest plan anyone in Castle Rock can order from Centurylink goes up to 2,000 Mbps, the slowest package only goes up to 200 Mbps, and the city-wide average maximum speed for Castle Rock customers is up to 975 Mbps.
Show all download speeds
- 1.5% up to 2,000.0 Mbps
- 34.3% up to 1,000.0 Mbps
- 63.9% up to 940.0 Mbps
- 0.3% up to 200.0 Mbps
Centurylink fiber upload speeds
In Castle Rock download speeds tend to be faster than than upload speeds for Centurylink fiber. Compared to other ISPs, Centurylink is above average where upload speeds are concerned, and below average compared to other Castle Rock fiber providers. Centurylink offers 4 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castle Rock is up to 1,000 Mbps. Some customers have slower plan choices, which only go up to 200 Mbps. On average, Centurylink customers can get speeds up to 904 Mbps.
Show all upload speeds
- 35.8% up to 1,000.0 Mbps
- 56.2% up to 940.0 Mbps
- 0.4% up to 500.0 Mbps
- 7.5% up to 200.0 Mbps
XFINITY from Comcast Fiber in Castle Rock, CO
XFINITY fiber coverage
About 3.32%, or 2,736 people, have XFINITY fiber internet available to them in the city. The company covers the northeast, west, north, and northwest Castle Rock area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of Castle Rock.
XFINITY from Comcast fiber download speeds
XFINITY is above average when comparing download speeds to all other internet providers in Castle Rock. Versus other fiber providers in the area, XFINITY fiber is below average. There are 2 different maximum speeds throughout Castle Rock. The fastest plan anyone in Castle Rock can order from XFINITY goes up to 2,000 Mbps, the slowest package only goes up to 1,200 Mbps, and the city-wide average maximum speed for Castle Rock customers is up to 1,230 Mbps.
Show all download speeds
- 3.8% up to 2,000.0 Mbps
- 96.2% up to 1,200.0 Mbps
XFINITY from Comcast fiber upload speeds
In Castle Rock download speeds tend to be faster than than upload speeds for XFINITY fiber. Compared to other ISPs, XFINITY is below average where upload speeds are concerned, and the slowest compared to other Castle Rock fiber providers. XFINITY offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castle Rock is up to 250 Mbps. Some customers have slower plan choices, which only go up to 35 Mbps. On average, XFINITY customers can get speeds up to 43 Mbps.
Show all upload speeds
- 3.8% up to 250.0 Mbps
- 96.2% up to 35.0 Mbps
Castle Rock Fiber by Area
This information is most helpful to those looking for homes or considering moving to Castle Rock or any of the areas nearby.
How does fiber internet in Castle Rock compare to the rest of Colorado?
Fiber internet speeds in Castle Rock are much faster versus the average speeds in Colorado: 0.00 Mbps in Colorado versus 1,983 Mbps in the city. The state has similar fiber availability compared to the city. Average fiber coverage in Colorado is 0.00% versus 32.09% in Castle Rock.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around Castle Rock are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does fiber internet look like in other cities?
Below are cities nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Cities
- Castle Pines North, CO: less fiber coverage, faster speeds
- Sedalia, CO: less fiber coverage, slower speeds
- The Pinery, CO: less fiber coverage, faster speeds
- Franktown, CO: less fiber coverage, slower speeds
- Parker, CO: more fiber coverage, faster speeds
- Stonegate, CO: less fiber coverage, slower speeds
- Lone Tree, CO: more fiber coverage, slower speeds
- Meridian, CO: more fiber coverage, faster speeds
- Larkspur, CO: more fiber coverage, slower speeds
- Highlands Ranch, CO: less fiber coverage, faster speeds
Cities with Similar Populations
- Bloomington, IN: more fiber coverage, faster speeds
- Broken Arrow, OK: more fiber coverage, faster speeds
- Brownsville, TX: more fiber coverage, faster speeds
- Bloomington, IL: more fiber coverage, faster speeds
- Bowling Green, KY: more fiber coverage, faster speeds
- Bloomington, MN: more fiber coverage, faster speeds
- Buckeye, AZ: more fiber coverage, faster speeds
- Boca Raton, FL: more fiber coverage, faster speeds
- Bethlehem, PA: less fiber coverage, slower speeds
- Bronx, NY: more fiber coverage, faster speeds