Combined sales tax rate
8.1%
Town of Castle Rock (home rule), Douglas County, CO
What makes up the rate
- State2.9%
- County1%
- City4.2%
Sales tax calculator
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Tax $8.10 · Total $108.10
Good to know
- State 2.9% + Douglas County 1.0% + Town of Castle Rock 4.2%.
- DR 1002 states the Town of Castle Rock is outside both the RTD (1%) and Scientific & Cultural Facilities District (0.1%) taxes that apply elsewhere in Douglas County.
- Colorado DR 1002 (July 2026) shows no July 1, 2026 change for this jurisdiction.
- Home-rule city tax is collected by the city itself, not the state.
Castle Rock vs nearby cities
- Castle Rock8.1%
- Breckenridge8.875%
- Fort Collins8.3%
Other Local City Network guides in the same state, nearest first.
Questions
What is the sales tax rate in Castle Rock?
8.1% for most purchases, effective July 1, 2026, per the Colorado DOR, DR 1002 Colorado Sales/Use Tax Rates, July 2026 edition.
What makes up the Castle Rock sales tax?
State 2.9%, County 1%, City 4.2%.
How much tax is on a $100 purchase in Castle Rock?
$8.10 on a $100 purchase, for a total of $108.10.
Where does this rate come from?
Colorado DOR, DR 1002 Colorado Sales/Use Tax Rates, July 2026 edition. Rates can differ at some addresses (special districts) and for some items; check the official source for a specific address.
Source: Colorado DOR, DR 1002 Colorado Sales/Use Tax Rates, July 2026 edition, effective July 1, 2026; checked 2026-11-07. Not tax advice.