ZIP reports / CO / 80109
ZIP rental intelligence · 2026-06

ZIP 80109, Castle Rock, CO

Asking rent, household capacity, housing stock and local context—kept at their original geographic and measurement scopes.

Direct local rent answer

What does rent cost in ZIP 80109?

The latest Zillow ZORI for ZIP 80109 is $2,699 per month in 2026-06. It is a typical observed asking-rent index across rental types—not an arithmetic average, signed lease or quote for one property.

Zillow asking-rent index$2,6992026-06 · up 5.3% year over year
ACS median gross rent$2,304ACS 2024 5-year survey · ±$141 margin of error
HUD two-bedroom standard$2,089Administrative FMR/SAFMR · not asking rent
Bedroom-level rent benchmarks in ZIP 80109
BedroomsModelled asking-rent lensHUD standardHow to use it
Studio$2,123ZORI scaled by the local HUD bedroom ladder$1,643HUD FMR/SAFMR administrative benchmarkCompare with current same-bedroom listings; do not average these two measures.
1 bedroom$2,266ZORI scaled by the local HUD bedroom ladder$1,754HUD FMR/SAFMR administrative benchmarkCompare with current same-bedroom listings; do not average these two measures.
2 bedrooms$2,699ZORI scaled by the local HUD bedroom ladder$2,089HUD FMR/SAFMR administrative benchmarkCompare with current same-bedroom listings; do not average these two measures.
3 bedrooms$3,532ZORI scaled by the local HUD bedroom ladder$2,734HUD FMR/SAFMR administrative benchmarkCompare with current same-bedroom listings; do not average these two measures.
4 bedrooms$3,939ZORI scaled by the local HUD bedroom ladder$3,049HUD FMR/SAFMR administrative benchmarkCompare with current same-bedroom listings; do not average these two measures.

Bedroom estimates are modelled, not observed rents. Zillow, Census ACS and HUD describe different housing universes and remain separate throughout this report.Zillow pulled 2026-08-08

Median household income$155,025ACS 2024 5-year · ±$8,586 MOE
Renter share18.6%1,806 renter households
Rent burden 30%+60.4%1,091 observed households
Housing vacancy1.5%145 of 9,873 units
Six views · one local decision

Read the measures together, without merging them

ZORI tracks observed asking rent, ACS describes occupied renter homes, and HUD publishes an administrative benchmark. The charts preserve those differences and add wider context only where the geography is named.

Three definitions of rent

Useful as a spread, not interchangeable observations.

Three rent measures for ZIP 80109Zillow asking-rent index$2,699ACS median gross rent$2,304HUD two-bedroom standard$2,089

Affordability screen

Annual income implied by 30% of the current ZIP ZORI.

Income screen for ZIP 80109ACS median household income$155,025Income at 30% of ZIP ZORI$107,960

Bedroom ladder

Modelled from ZIP ZORI using the local HUD ladder.

Modelled bedroom rent ladder for ZIP 80109Studio$2,123One bedroom$2,266Two bedrooms$2,699Three bedrooms$3,532Four bedrooms$3,939

Observed renter burden

ACS ZCTA households with computable gross-rent burden.

Observed renter cost burden in ZCTA 8010930% or more of income1,091 householdsBelow 30%715 households

ZIP versus wider rent context

Each bar retains its own ZIP, city, county or metro scope.

Asking-rent context for ZIP 80109ZIP 80109$2,699Castle Rock city$2,493Douglas County county$2,306Denver-Aurora-Lakewood, CO metro$1,930

Monthly asking-rent history

Direct Zillow ZORI observations over the latest five years. Missing months remain visible gaps.

Five-year direct Zillow asking-rent history for ZIP 80109; missing months remain gaps$2,777$2,540$2,304$2,0672021-062023-122026-06
Five-year change
25.8%exact same-month endpoints
Largest observed drawdown
1.4%peak to a later observed month
Annualized monthly variability
2.1%101 consecutive returns
Monthly coverage
100.0%102 of 102 months
Decision brief

What the evidence says for ZIP 80109

At June 2026, this Zillow ZIP market has a Zillow Observed Rent Index, or ZORI, of $2,699 per month. ZORI is a typical observed asking-rent index blended across rental types, not a count of signed leases or a single-property quote. The direct rolling-three-month Redfin ZIP resale observation puts the median sold price at $646,854, a 1.09% year-over-year change. Annualized ZIP ZORI divided by that median sold price is 5.01%, solely a cross-source screening ratio. It pairs a rent index with resale prices and does not describe operating costs, a particular home, or a property-level outcome.

The backward-looking ZORI history supplies a notably stronger movement signal than the contemporaneous sale-price change. Exact same-month change was 5.28% over one year, compared with annualized 3.17% over three years and 4.70% over five years. The latest pace therefore confirms the longer upward path and is faster than both multi-year measures; it does not forecast a continuation. Annualized monthly-return variability was 2.13%, and the maximum peak-to-trough drawdown was 1.42%, with 100% coverage. Transparent national discovery ranks were 575 for momentum, 224 for stability, and 93 for the balanced score among history-eligible ZIPs, where lower is higher. The low recorded variability lends more historical continuity to a current index snapshot than a jagged series would, but cannot turn one asking-rent reading into a guarantee.

The matched Census ZCTA record is deliberately a different evidence universe. The five-digit 80109 label is both Zillow’s ZIP market identifier and a Census ZCTA match; a ZCTA is a statistical area and is not identical to a USPS delivery ZIP. In the ACS 2024 five-year survey, occupied renter homes had a median gross rent of $2,304. That measure includes selected utilities, whereas ZORI represents typical observed asking rent, and the current index is 17.14% higher. The gap is a scope and timing comparison, not evidence that any available rental commands the index or that a surveyed household would face a new asking rent.

The bedroom view is modelled rather than measured. Scaling ZIP ZORI through the supplied local HUD ladder produces monthly modelled estimates of $2,123 for a studio, $2,266 for one bedroom, $2,699 for two bedrooms, $3,532 for three bedrooms, and $3,939 for four bedrooms. The fiscal-year 2026 local HUD FMR/SAFMR ladder is an administrative, bedroom-specific standard rather than asking rent; its two-bedroom standard is $2,089. These figures provide proportional brackets around the ZIP index only. They are not observed bedroom rents, lease offers, or proof that every property of a given bedroom count fits the modelled level.

Affordability screen and burden data also need separate readings. The matched ZCTA ACS median household income is $155,025. Applying a 30% share to the current monthly ZORI produces a required annual income of $107,960; this is arithmetic, not advice and not an applicant qualification rule. The index-to-income screen is 20.89%. Separately, ACS reports 1,091 renter households, or 60.41% of the renter population, with gross-rent burden at or above that threshold. The burden estimate summarizes surveyed occupied renter households, while the threshold uses the current asking-rent index. Neither result can establish the finances of a particular renter, the terms of a prospective lease, or affordability of a specific unit.

Housing stock describes the ZCTA aggregate, not an availability feed. ACS records 9,873 housing units and a 1.47% vacancy rate. Of the recorded stock, 8,695 units are single-family and 459 are large multifamily. That aggregate combination says neither that a particular unit is vacant nor that its terms match ZORI. For broader rental context only, the ZIP index is 8.24% above the Castle Rock city context rent measure, 17.04% above the Douglas County county context rent measure, and 39.84% above the Denver-Aurora-Lakewood, CO metro context rent measure. City, county, and metro figures are wider-scope contextual comparisons, not ZIP substitutes.

Resale liquidity must stay inside Redfin’s direct rolling-three-month ZIP for-sale observation. Redfin recorded 169 homes sold, a median 22 days on market, 146 homes of inventory, and 2.6 months of supply. Its sale-to-list signals were a 99.26% average sale-to-list ratio and a 19.53% share sold above list. These are resale transaction and listing signals, not rental transactions, rental comparables, or property economics. They show observable resale activity alongside the modest price change stated above, while the rent index’s stronger latest annual movement creates a tension with any simple rent-versus-price reading. The screening ratio cannot resolve that tension because it omits property-specific expenses, financing, condition, and transaction differences.

Important limits remain even when each source is used as intended. ZORI blends rental types into an asking-rent index; ACS is a five-year ZCTA survey with sampling uncertainty; the HUD ladder is an administrative standard; and Redfin is a rolling resale observation. Their differing populations, construction methods, and reference periods prevent a direct unit-for-unit comparison. Concrete property-level checks can document the address’s market match, bedroom count, current advertised terms, included utilities, lease concessions, size, condition, and availability before comparing a listing with a modelled bracket. A purchase review can separately verify the actual sale, list chronology, and relevant property facts rather than extend ZIP resale medians to one home. Which documented current lease and direct-sale facts remain after these evidence universes are kept separate?

Decision signals

What deserves a closer property-level check

Recent rent movement exceeds the longer-run pace

Exact same-month Zillow history shows the most recent asking-rent increase running faster than either multi-year annualized comparison. Complete historical coverage, low annualized monthly-return variability, and a shallow recorded drawdown describe an index path with continuity in the observed period. The transparent national ranks place the balanced discovery measure ahead of the separate momentum and stability ranks, but the rankings and history remain backward-looking measurements.

Rent measures answer different questions

ZORI’s asking-rent index, ACS median gross rent, and the HUD FMR/SAFMR ladder should not be substituted for one another. ZORI blends rental types; ACS describes occupied renter homes and selected utilities in a matched statistical area; HUD sets a bedroom-specific administrative benchmark. The ZIP bedroom figures are modelled by applying that HUD ladder to ZORI, so they convey a proportional estimate rather than measured rents.

Aggregate affordability does not identify a unit

The income screen is a calculation using the current ZIP asking-rent index and the stated household-income measure, whereas the rent-burden result comes from the ACS renter population. Both provide useful aggregate framing, but neither confirms a household’s budget or a unit’s lease terms. Aggregate vacancy and structure counts similarly define the ZCTA stock mix without identifying which homes are actually available to rent.

Resale activity and rent movement are not fully aligned

Redfin provides a direct ZIP resale observation with completed-sale prices, transaction pace, inventory, supply, and sale-to-list evidence. Its slower price movement than the latest rent-index movement is the report’s central cross-universe tension. The annualized-rent-to-sale-price calculation only screens two source series against each other; it omits expenses, property traits, and the distinction between asking rents and sale transactions.

  • The current rent figure is a blended ZIP asking-rent index, so variation by bedroom, property condition, lease duration, concessions, and included utilities may be material for any individual listing.
  • ACS estimates represent a five-year matched ZCTA survey and include sampling uncertainty; the ZCTA boundary is statistical rather than identical to a USPS delivery ZIP, limiting unit-level inferences.
  • The bedroom estimates inherit the local HUD FMR/SAFMR ladder’s proportional structure. Because HUD is an administrative standard rather than asking rent, the estimates can differ from actual advertised bedroom rents.
  • Redfin resale data concern for-sale activity, not rental transactions. The rent-to-price screen excludes operating expenses, financing, property condition, and timing differences, so it cannot characterize a particular asset.
Direct ZIP resale evidence

For-sale liquidity inside ZIP 80109

Redfin reports these as a rolling three-month ZIP observation through 2026-06-30. They describe the for-sale market, not rental vacancy or the rent of a particular property.

Median sale price$646,854+1.1% year over year
Homes sold169rolling three-month observation
Median days on market22 daysfor-sale listing absorption
Months of supply2.6resale inventory relative to sales pace

Activity and available supply

Direct ZIP counts remain separate because each describes a different stage of the resale funnel.

Direct resale activity for ZIP 80109Active listings316Inventory146Pending sales163Homes sold169

Counter-signals before underwriting

A price alone does not reveal how quickly buyers are absorbing available homes.

Inventory direction

146 observed inventory · -6.3% year over year.

Price realization

99.3% average sale-to-list ratio · 19.5% sold above original list.

Early absorption

39.9% went off market within two weeks; compare this with 22 median days on market.

Measurement boundary

Small ZIP samples can move sharply. This rolling period smooths monthly noise but does not replace current address-level sale and rent comparables.

Redfin Data Center · updated 2026-07-03 · exact five-digit ZIP key. Implausible source values are withheld as n/a rather than repaired or inherited from a broader geography.

Wider market evidence

Listing and rental liquidity around the ZIP

These measures are not ZIP observations. They are labelled county or metro context so they can challenge the local story without being copied into it.

Douglas County listing conditions

1,915 active Realtor.com listings · 47 median days on market · 31.7% price-reduced share · 2026-06.

Denver-Aurora-Lakewood, CO resale supply

2.9 months of supply · 21 median days on market · 41.8% listings with price drops · Redfin 2026-05-01.

Apartment List metro liquidity

8.3% reported apartment vacancy · 33 days on market. These are direct metro observations and do not describe a particular ZIP unit.

Property-level next step

Compare live same-bedroom listings, concessions, utilities, condition and days listed inside ZIP 80109. The report frames the market; it does not replace a rent roll, lease review or address-level comparable set.

Questions this report can answer

Scope-aware answers

Why is the current Zillow asking-rent reading above ACS median gross rent?

They are not the same population or measure. ZORI is a ZIP-level typical observed asking-rent index blended across rental types. ACS is a matched ZCTA five-year survey of occupied renter homes and includes selected utilities. The ZCTA is statistical rather than USPS delivery geography, so its median is not a contemporaneous new-listing rent comparison.

Are the bedroom figures measured rents for available homes?

No. They are modelled monthly ZIP estimates generated by scaling ZORI with the supplied local HUD FMR/SAFMR bedroom ladder. HUD is an administrative bedroom-specific standard, not asking rent. The resulting figures provide a consistent proportional framework across sizes, but they do not observe lease offers, executed rents, or individual properties.

Does the required-income screen determine whether a household can qualify?

No. The required-income figure simply applies the current index to a thirty-percent-of-income screen. The burden share separately summarizes ACS survey results for occupied renter households. The two measures use different evidence universes and cannot determine an applicant’s finances, an owner’s terms, or whether an individual vacancy is affordable.

How should the resale information and rent-to-price screen be interpreted?

Redfin metrics here are direct rolling-three-month ZIP for-sale observations, covering resale pricing, supply, marketing time, and sale-to-list outcomes rather than rentals. The annualized ZORI divided by the median sold price is only a cross-source screening ratio. It is not a property-level economics measure and does not incorporate expenses, financing, condition, or transaction-specific facts.