10 county-level rules, plus city-specific rules for 2 cities in Adams County, Colorado.
Verified from official government sources
Unincorporated Adams County, Colorado does not have a short-term rental ordinance and requires no county STR permit or license. Hosts must still hold a Colorado sales tax license and collect state-administered taxes. Inside Commerce City, Thornton, Northglenn or other cities, the city's own STR rules apply.
Adams County has no short-term-rental-specific noise rule. Guest noise is governed by Colorado's state noise statute, CRS 25-12-103, limiting residential zones to 55 dB(A) during the day (7am-7pm) and 50 dB(A) at night, measured 25 feet beyond the property line.
Colorado taxes furnished rooms and accommodations rented for less than 30 consecutive days. Under CRS 39-26-104, stays of 30+ days are exempt. Adams County sales tax is collected by the state; a county lodging tax is possible only if voters approve one under CRS 30-11-107.5.
CRS 39-26-104
Amounts paid for the use of furnished rooms or accommodations...are subject to the tax imposed under this section unless the rental period is for a term of thirty consecutive days or more, in which case the rental paid is exempt.
Unincorporated Adams County has no short-term-rental-specific parking requirement. Guest parking is governed by the general Development Standards and Regulations (zoning off-street parking) and county right-of-way rules. Cities within the county may set their own STR parking minimums.
Unincorporated Adams County sets no short-term-rental-specific occupancy limit. Maximum occupancy is governed instead by the adopted building code, on-site wastewater (septic) capacity, and general safety rules. Cities within the county may impose their own guest caps.
Unincorporated Adams County does not require short-term rental hosts to carry a specific liability insurance amount, because it has no STR ordinance. Hosts should still secure short-term-rental or commercial liability coverage, as standard homeowners policies often exclude rental activity.
Unincorporated Adams County places no cap on the number of nights a home may be rented short-term each year, because it has no STR ordinance. Any stay under 30 consecutive days is taxable, but the county sets no annual rental-night limit. Some cities do cap nights.
Adams County runs a voluntary business registration program, not a mandatory short-term rental registry. There is no required county STR registration for unincorporated properties. Hosts should still register a sales tax account with the Colorado Department of Revenue, which handles all county sales tax collection.
Unincorporated Adams County imposes no host-presence or local-contact requirement for short-term rentals, because it has no STR ordinance. Unhosted (whole-home) rentals are not restricted on that basis. Some Adams County cities require a 24/7 local responsible-agent contact.
Unincorporated Adams County does not require a short-term rental to be the host's primary residence. Because there is no county STR ordinance, non-owner-occupied and investor-owned short-term rentals are not prohibited on that basis. Some Adams County cities do impose primary-residence limits.
2 cities in Adams County have their own short-term rentals rules. Each link goes to that city's dedicated page with code citations.
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