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Single Family ResidenceResidential
$543,930$527 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 97How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $185,000 on Jan 30, 2008

421 RIDDLE DR

FORT COLLINS, CO 80521
3
Beds
1
Baths
1,032 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1960
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$544K
$527K low$561K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$185,000 · Jan 30, 2008
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$241,130
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$192,904
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.54%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$147,800
SUNTRUST MORTGAGE INC · 3.99% 2 · recorded Aug 10, 2010
2nd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$115,000
PUBLIC SERVICE CU
3rd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$40,000

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,840 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$33,279 (2024)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$2,546
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$30,733
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$33,279
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$496,700

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Ranch
CountyLarimer
Lot (acres)The size of the land the home sits on, from county records.0.16
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Block (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 500 ft²

Transaction History(2)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Putnam Elementary School of ScienceB+
Elementary · Grades PK–5 · 0.3 mi
M
Lincoln Middle IB World SchoolC
Middle · Grades 6–8 · 0.5 mi
H
Poudre High SchoolB+
High · Grades 9–12 · 1.3 mi

District: Poudre School District R-1

Neighborhood · ZIP 80521These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.124
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.50

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.28%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.37,077
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,576 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$64,880
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$84,296
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.16 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

421 Riddle Dr measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Costs more per square foot than 91% of homes in Larimer County
  • Smaller than 87% of homes in Larimer County
  • Has a bigger lot than 72% of homes in Hanna Farm
  • Older than 89% of homes in Larimer County

What homes are worth in Fort Collins 80521

Each bar is how many homes fall in that price range. The marker is this home.

This home
$245K$1.4M

This home is worth more than 51% of homes in Fort Collins 80521.

How it measures up in Fort Collins 80521

The dot is this home. The mark in the middle is the typical home in Fort Collins 80521.

Estimated value$543,930
CheaperTypical $539,926Pricier

Pricier than 51% of homes nearby

Price per ft²$527
CheaperTypical $413Pricier

Pricier than 76% of homes nearby

Living area1,032 ft²
SmallerTypical 1,300 ft²Bigger

Bigger than 27% of homes nearby

Lot size0.16 ac
SmallerTypical 0.19 acBigger

Bigger than 36% of homes nearby

Year built1960
OlderTypical 1966Newer

Newer than 39% of homes nearby

How 421 Riddle Dr ranks against every home in each area.
MeasureThis homeHanna FarmFort Collins 80521Larimer County
Estimated valuepricier than$543,93063% of homes51% of homes46% of homes
Price per ft²pricier than$52773% of homes76% of homes91% of homes
Living areabigger than1,032 ft²36% of homes27% of homes13% of homes
Lot sizebigger than0.16 ac72% of homes36% of homes34% of homes
Year builtnewer than196055% of homes39% of homes11% of homes

About 421 Riddle Dr

How much is 421 Riddle Dr, Fort Collins, CO worth?

The TopHap Estimate for 421 Riddle Dr, Fort Collins, CO is $543,930 as of Jul 14, 2026. The likely range is $526,774 to $561,086. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Riddle Dr, Fort Collins, CO last sell?

421 Riddle Dr, Fort Collins, CO last sold on Jan 30, 2008 for $185,000, according to the county's recorded deed.

How big is 421 Riddle Dr, Fort Collins, CO?

421 Riddle Dr, Fort Collins, CO has 3 bedrooms, 1 bathrooms, 1,032 square feet of living space and a 0.16-acre lot.

When was 421 Riddle Dr, Fort Collins, CO built?

421 Riddle Dr, Fort Collins, CO was built in 1960, making it 66 years old. It is a ranch home. The building has 1 story.

What schools serve 421 Riddle Dr, Fort Collins, CO?

421 Riddle Dr, Fort Collins, CO is assigned to Putnam Elementary School of Science (elementary), rated B+; Lincoln Middle IB World School (middle), rated C; Poudre High School (high), rated B+. All sit in Poudre School District R-1. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Riddle Dr, Fort Collins, CO compare to other homes in Fort Collins 80521?

Among the 9,062 homes in Fort Collins 80521, it is worth more than 51% of them ($543,930 against a typical $539,926), its price per square foot is higher than 76% of them ($527 against a typical $413), it is bigger than 27% of them (1,032 ft² against a typical 1,300 ft²), its lot is bigger than 36% of them (0.16 ac against a typical 0.19 ac) and it is newer than 39% of them (1960 against a typical 1966). Measured against all of Larimer County, it is worth more than 46% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 421 Riddle Dr, Fort Collins, CO?

The 2024 property tax bill for 421 Riddle Dr, Fort Collins, CO was $2,840. The county assessed it at $33,279.

More homes on Riddle Dr

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Assigned schools

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