Total monthly cost of ownership
Cost to Own a Home in Castle Rock, Colorado
A $622,000 home here costs
$4,401per month, all in — with 20% down at today's 6.66% 30-year fixed rate.
A standard mortgage calculator would have told you $3,198. The real number is $1,203 higher every month — 38% more than the payment most buyers budget for.
Where every dollar goes
Only the first line is a mortgage payment. Change any assumption above and every figure below recalculates.
Castle Rock against Douglas County and Colorado
| Measure | Castle Rock | Douglas County |
|---|---|---|
| Median home value | $621,700 | $674,000 |
| Median property tax | $3,493 | $3,707 |
| Effective tax rate | 0.562% | 0.550% |
| Median gross rent | $1,946 | $2,095 |
| Population | 76,614 | 368,283 |
The weather behind that power bill
Castle Rock sits in Douglas County, which averages a high of 85.7°F in its hottest month and a low of 18.0°F in its coldest, with 17.6" of precipitation a year and 40% of it in a single three-month stretch. That climate drives 498 cooling and 6,103 heating degree days, which is what sets the $145 electricity line above.
See the full climate breakdown for Douglas County — month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in Douglas County
Full Douglas County cost breakdown · Every county in Colorado
Common questions
How much does it cost to own a home in Castle Rock?
A $622,000 home in Castle Rock, Colorado costs approximately $4,401 per month with 20% down at 6.66%. That is $3,198 principal and interest, $291 property tax, $180 homeowners insurance, $213 utilities and $518 set aside for maintenance.
What is the property tax rate in Castle Rock?
Castle Rock has an effective property tax rate of 0.562%, based on a median home value of $621,700 and median real estate taxes of $3,493. That is higher than the Douglas County average of 0.550%.
What is the average home price in Castle Rock?
The median owner-occupied home value in Castle Rock, Colorado is $621,700, against $674,000 across Douglas County.
Is it cheaper to rent or buy in Castle Rock?
Median gross rent in Castle Rock is $1,946 a month, against $4,401 to own the median home all in. Renting costs less month to month here, though renting builds no equity.
Sources & methodology
- Median home value, real estate taxes, gross rent and population for Castle Rock — US Census Bureau, American Community Survey ACS 2023 5-Year, place-level tables.
- Homeowners insurance — NAIC average premium for Colorado.
- Electricity price — EIA Electric Power Monthly Table 5.6.A.
- Mortgage rate — Freddie Mac PMMS, refreshed weekly.
- Maintenance (1%/yr) and water and sewer ($68/mo) are national estimates. Every assumption above is editable.