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Thornton, CO · Adams County · Population ~140,000 (6th Largest CO City) · No Local Rent Control (HB 21-1117 2021; Thornton Has NOT Enacted Ordinance) · 10-Day Non-Payment Notice · 60-Day Deposit Return 3× Willful Withholding · Denver International Airport ~35 Min · 37,000+ Airport Employees · Amazon Adams County Fulfillment · Adams 12 Five Star Schools ~6,000 Employees · Eastlake at 124th RTD N Line · Suncor Energy Refinery · Adams County Court Brighton

Thornton CO rent increase 2026 Thornton, Colorado has no local rent control ordinance. Colorado HB 21-1117 (April 2021) repealed the statewide rent control preemption (Prop. 10 / CRS §38-12-301 from 1994), returning local authority to cities — but Thornton City Council has NOT enacted any local rent stabilization or rent increase ordinance. Thornton landlords may raise rent freely. CRS §38-12: no deposit cap; 60-day return (or 30 days with written demand); 3× willful wrongful withholding + attorney fees. 10-day non-payment notice (CRS §13-40-104; HB 21-1121). Adams County; ~140,000 population; 6th largest Colorado city. Denver International Airport (~35 min; 37,000+ direct airport employees; one of the US’s largest airport employment clusters). Amazon Adams County fulfillment. Adams 12 Five Star Schools (~6,000 employees). Eastlake at 124th RTD N Line terminus (downtown Denver ~45 min). Suncor Energy refinery. Adams County Court (1100 Judicial Center Dr, Brighton CO 80601) handles all Thornton evictions.

Thornton, Colorado — the sixth-largest city in Colorado with approximately 140,000 residents, anchored by proximity to Denver International Airport, north Adams County logistics employment, and the Eastlake RTD North Metro Rail Line terminus — has no local rent control ordinance. Colorado law allows cities to enact rent control since 2021, but Thornton City Council has not done so. Thornton landlords may raise rent freely at lease expiration.

Thornton landlords operate under Colorado state landlord-tenant law (CRS Chapter 38-12): no deposit cap, 60-day return deadline (or 30 days with written demand), and a significant 3× penalty for willful wrongful withholding. Non-payment evictions require a 10-day notice before filing in Adams County Court in Brighton.

Thornton’s location at the nexus of Denver International Airport commuter demand, the I-25 north corridor, and the RTD N Line makes it one of the most affordable large suburbs in the Denver metro while maintaining strong rental demand from DIA workers, logistics employees, and families in the Adams 12 school district.

Thornton 2026 rent control status: quick reference

Question Answer
Rent control in Thornton? None. Colorado HB 21-1117 (2021) returned local authority; Thornton has NOT enacted any ordinance.
Annual rent increase cap? No cap. Any amount at renewal or with appropriate notice (month-to-month).
Security deposit cap? No statutory cap. Any agreed amount; market norm is 1–2 months’ rent.
Deposit return deadline? 60 days (or 30 days with tenant’s written demand) after tenancy ends (CRS §38-12-103(1)).
Penalty for willful deposit withholding? 3× amount wrongfully withheld + attorney fees (CRS §38-12-103(3)). Willful violations only.
Notice for month-to-month rent increase? 21–28 days written notice best practice (mirrors MTM termination notice under CRS §13-40-107).
Entry notice requirement? 24 hours advance written notice for routine entry (CRS §38-12-1102; HB 19-1118).
Non-payment eviction notice? 10-day Demand for Payment or Possession (CRS §13-40-104; HB 21-1121); genuine cure right.
Eviction court? Adams County Court, 1100 Judicial Center Dr, Brighton CO 80601 (~20 miles north of central Thornton).
Just-cause eviction required? No. Colorado has no statewide just-cause eviction requirement for non-renewal.
Self-help eviction? Prohibited. CRS §38-12-510 — up to $5,000 punitive damages + actual damages + attorney fees.

Colorado rent control law: what Thornton landlords need to know

Colorado’s history with rent control has two distinct chapters. From 1994 to 2021, Colorado Revised Statutes §38-12-301 (enacted via the 1994 Proposition 10 ballot initiative) prohibited any Colorado city or county from enacting rent control. In April 2021, Governor Jared Polis signed House Bill 21-1117, repealing §38-12-301 and returning local authority to Colorado municipalities.

Since HB 21-1117 took effect, no Colorado city has enacted a rent stabilization ordinance. Denver, Aurora, Lakewood, Westminster, and Thornton have all declined to enact rent control, focusing instead on zoning reform and affordable housing programs. Thornton City Council has not introduced, debated, or passed any rent stabilization ordinance as of 2026.

Colorado security deposit rules for Thornton landlords

  • No deposit cap. Colorado imposes no statutory maximum security deposit. Thornton market practice is typically 1–2 months’ rent plus a separate pet deposit for pet-friendly units.
  • Return deadline: 60 days after the tenancy ends, OR 30 days if the tenant provides a written demand (CRS §38-12-103(1)). Best practice: use 30 days as the standard.
  • Itemized statement required. Any partial return must include a written itemized statement identifying each deduction and dollar amount (CRS §38-12-103(2)).
  • Willful wrongful withholding: 3× penalty plus attorney’s fees and costs (CRS §38-12-103(3)). The 3× penalty applies only to willful violations.

Major employers and rental demand in Thornton CO

Denver International Airport

Denver International Airport (8500 Peña Blvd, Denver CO 80249; opened February 28, 1995; named DEN by IATA) is approximately 30–38 minutes from central Thornton via I-270 east to E-470 north, or via E-470 south to Peña Blvd. DIA is the fifth-busiest airport in the United States by total passenger traffic (approximately 77–82 million passengers annually) and the largest airport by land area (53 square miles).

DIA directly employs approximately 37,000 people on-airport: United Airlines (United’s largest hub; approximately 7,000–9,000 United employees at DEN), Frontier Airlines (Denver HQ; approximately 3,000+ at DEN), Southwest Airlines, American Airlines, Delta Air Lines, TSA (~2,500 officers), U.S. Customs and Border Protection, airport operations (Denver International Airport authority; ~1,500), concessions and retail (Paradies Lagardère, OTG, local operators; ~4,000), ground handling, cargo, maintenance, and fueling operators.

DIA ground operations and service workers (earning $45,000–$75,000) predominantly live in Adams County and northeast Denver because of the affordable rent-to-wage ratio and reasonable commute. Thornton, Aurora (north/Adams County portion), and north-central Denver ZIP codes within 20–30 minutes of DIA house a large concentration of these workers in the $1,100–$1,800 rent range.

Amazon — Adams County fulfillment

Amazon operates multiple fulfillment, sortation, and delivery station facilities in Adams County and the greater Thornton area. The I-76 and I-25 corridors through Adams County house large-format fulfillment infrastructure; Amazon’s combined Adams County employment is estimated at 1,500–3,000 workers at peak (higher during Q4 holiday season). Base wages for Amazon associates in Colorado were $19–$22/hr in 2026, generating rental demand in the $1,100–$1,700 range for south and central Thornton.

Adams 12 Five Star Schools

Adams 12 Five Star Schools is the school district serving most of Thornton and parts of Federal Heights, Northglenn, and unincorporated Adams County. With approximately 42,000 students (one of the larger metro-area school districts) and approximately 6,000 employees (teachers, paraprofessionals, counselors, administrators, and support staff), Adams 12 is one of Thornton’s largest single employers. Teacher compensation in Adams 12 ranges from approximately $50,000 (starting) to $100,000+ (senior with credentials), generating solid mid-market rental demand in the $1,300–$1,900 range for families and professionals throughout Thornton.

Suncor Energy — Commerce City refinery

Suncor Energy’s Commerce City Refinery (5900 Brighton Blvd, Commerce City CO 80022 — immediately south of Thornton at the Denver/Adams County border) is one of the largest petroleum refineries in the Rocky Mountain region, processing approximately 98,000 barrels per day. The facility employs approximately 1,000–1,500 refinery operators, engineers, and maintenance staff, with compensation in the $75,000–$150,000 range for skilled trades and engineers. Many Suncor employees rent or own in south Thornton and Federal Heights near the E. 88th Ave / Commerce City border.

Eastlake at 124th — RTD N Line and transit-driven demand

The Eastlake at 124th station (E. 124th Ave, Thornton CO 80241) is the northern terminus of the RTD North Metro Rail Line (N Line), which opened to Eastlake in 2019 after years of construction. The N Line provides direct commuter rail service from north Thornton to downtown Denver Union Station in approximately 40–50 minutes. At Union Station, N Line riders connect to the A Line for DIA and to other light rail and bus lines.

The Eastlake corridor has attracted significant new development since the N Line opened: master-planned communities such as Thornton Farms, Reserve at Eastlake, and Eastlake Shores offer newer 2010s–2020s inventory at $1,400–$2,100 for 1BR, commanding a transit-access premium over comparable south Thornton units.

Thornton rental market: neighborhoods and 2026 rent ranges

Neighborhood / Submarket 1BR 2026 2BR 2026 Primary demand driver
Eastlake / North Thornton (N Line terminus corridor) $1,400–$2,000 $1,800–$2,500 RTD N Line commuters; new construction premium
144th Ave / OrchardTown Center corridor $1,300–$1,900 $1,700–$2,300 I-25 access; retail employment; DIA commuters
120th Ave / Washington St (central Thornton) $1,300–$1,800 $1,700–$2,200 Adams 12 school district families; established residential
104th Ave / Federal Blvd (south-central Thornton) $1,200–$1,700 $1,600–$2,100 Logistics workers; DIA commuters; value market
South Thornton / 84th Ave (Federal Heights adjacent) $1,100–$1,600 $1,400–$2,000 Suncor/Commerce City workers; affordable market
168th Ave+ growth edge (far north Thornton) $1,500–$2,100 $1,900–$2,600 New construction; growth corridor; newer families

Eviction process in Thornton CO: step-by-step

Colorado’s Forcible Entry and Detainer (FED) process applies in Thornton. All filings go to Adams County Court in Brighton (approximately 18–22 miles north of central Thornton). The total uncontested eviction timeline is approximately 4–6 weeks.

Non-payment eviction (CRS §13-40-104)

  1. 10-Day Demand for Payment or Possession: serve written notice stating the exact amount of rent owed and demanding payment or surrender within 10 days. If the tenant pays all past-due rent within 10 days, the landlord cannot continue the eviction.
  2. File FED complaint at Adams County Court: 1100 Judicial Center Dr, Brighton CO 80601. Filing fee approximately $85–$175. All Thornton addresses are in Adams County.
  3. Service and hearing: Adams County Sheriff serves the summons; hearing typically scheduled within 7–14 business days.
  4. Judgment and writ: if the landlord prevails, the court enters a judgment for possession; Writ of Restitution issued if tenant does not vacate; Adams County Sheriff executes lockout (24-hour door posting required).

Self-help eviction prohibition

CRS §38-12-510 prohibits changing locks, removing belongings, or shutting off utilities without a court order. Up to $5,000 punitive damages + actual damages + attorney fees.

10 common Thornton landlord mistakes under Colorado CRS

  1. Filing at the wrong courthouse. Thornton FED cases go to Adams County Court in Brighton, not to any Thornton municipal court. Filing at the wrong court means dismissal and restarting the process.
  2. Using the pre-2021 3-day eviction notice. Colorado extended the non-payment notice to 10 days in 2021 (HB 21-1121). Serving a 3-day or 5-day notice is invalid and requires restarting with a 10-day notice.
  3. Confusing the 30-day vs. 60-day deposit deadline. If the tenant sends a written demand for the deposit, the deadline drops to 30 days, not 60. Missing this shorter deadline triggers the 3× willful withholding penalty.
  4. Omitting the itemized statement. Returning a partial deposit without a written itemized statement of deductions is treated as wrongful withholding of the withheld amount.
  5. Deducting for normal wear and tear. Carpet wear, minor wall scuffs, and normal cleaning are not deductible from the security deposit.
  6. Entering without 24-hour notice. CRS §38-12-1102 requires at least 24 hours’ written notice before routine entry. Repeated unauthorized entries can constitute harassment under Colorado law.
  7. Overstating rent owed in the 10-day notice. The 10-day notice must state the exact amount of rent. Including non-rent charges (late fees, utility charges) without clear separation can invalidate the notice.
  8. Retaliating against tenants who request repairs. Colorado CRS §38-12-509 prohibits retaliatory eviction or rent increases within 60 days of a tenant making a good-faith habitability complaint.
  9. Ignoring DIA worker SCRA rights (if any active-duty military tenants). Buckley Space Force Base (south Aurora) and Air Force Academy (Colorado Springs) generate military tenants across the metro. SCRA early-termination rights apply to all active-duty servicemembers regardless of base location.
  10. Not documenting the condition of the unit at move-in. Colorado landlords who lack a signed move-in condition report have a harder time proving deductions go beyond normal wear and tear. Use a dated, signed checklist + photos at move-in.

Frequently asked questions: Thornton CO rent increase 2026

Does Thornton CO have rent control in 2026?

No. Thornton has no local rent control ordinance. Colorado HB 21-1117 (April 2021) returned local authority to cities but Thornton City Council has not enacted any rent stabilization measure. Landlords may raise rent freely. See the Colorado rent control preemption history for full background.

How much can a Thornton CO landlord raise rent in 2026?

Any amount at lease expiration. Month-to-month requires appropriate advance written notice (best practice: 21–28 days, matching CRS §13-40-107). No cap, no formula, no administrative approval. See the Denver CO rent guide for broader market context.

What is the security deposit rule for Thornton CO rentals?

No statutory cap. Must return within 60 days (or 30 days with written demand) per CRS §38-12-103(1). Willful wrongful withholding triggers 3× penalty + attorney fees. Written itemized statement required for partial returns.

What court handles Thornton CO evictions?

Adams County Court, 1100 Judicial Center Dr, Brighton CO 80601. All Thornton properties are in Adams County. Brighton is approximately 18–22 miles north of central Thornton.

How does Thornton compare to Westminster and Aurora for landlords?

All three cities operate under the same Colorado CRS framework: no local rent control, no deposit cap, 60-day return (30 days with written demand), 3× willful withholding penalty, 10-day notice. Thornton (Adams County; ~140,000) is the most affordable of the three on average, with strong DIA commuter demand. Westminster (Adams/Jefferson Counties; ~115,000) has Maxar Technologies and Lumen/Level3 as tech anchors. Aurora (Adams/Arapahoe Counties; ~390,000) is larger with the Anschutz Medical Campus as its dominant employer. See the Westminster CO rent guide and Aurora CO rent guide.

Does Thornton have any tenant protection laws beyond CRS §38-12?

No. Thornton has not enacted any local tenant protection ordinances. No local just-cause eviction requirement, no local relocation assistance mandate, no rent registry, no local habitability standard beyond CRS and state building codes.

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