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Single Family ResidenceResidential
$528,952$377 / 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 96How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $127,500 on Aug 6, 1999

423 RIDDLE DR

FORT COLLINS, CO 80521
3
Beds
1
Baths
1,404 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.
0.15 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.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$529K
$510K low$548K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$127,500 · Aug 6, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,974 (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.$34,679 (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.$32,133
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$34,679
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$517,600

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.35
53
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
44
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
79
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.16 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

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.0.15
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.Builtup (layered Asphalt)
HeatingThe type of heating system in the home.Forced Air
FireplaceWhether the home has a fireplace, and what kind.Yes
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 · 730 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 ScienceC
Elementary · Grades PK–5 · 0.3 mi
M
Lincoln Middle IB World SchoolC+
Middle · Grades 6–8 · 0.5 mi
H
Poudre High SchoolC
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%

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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

423 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.

  • Worth more than 77% of homes in Hanna Farm
  • Costs less per square foot than 75% of homes in Hanna Farm
  • Bigger than 75% of homes in Hanna Farm
  • Has a smaller lot than 71% of homes in Larimer County
  • 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
$247K$1.4M

This home is worth more than 53% 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$528,952
CheaperTypical $521,623Pricier

Pricier than 53% of homes nearby

Price per ft²$377
CheaperTypical $388Pricier

Pricier than 46% of homes nearby

Living area1,404 ft²
SmallerTypical 1,339 ft²Bigger

Bigger than 53% of homes nearby

Lot size0.15 ac
SmallerTypical 0.19 acBigger

Bigger than 30% of homes nearby

Year built1960
OlderTypical 1967Newer

Newer than 39% of homes nearby

How 423 Riddle Dr ranks against every home in each area.
MeasureThis homeHanna FarmFort Collins 80521Larimer County
Estimated valuepricier than$528,95277% of homes53% of homes44% of homes
Price per ft²pricier than$37725% of homes46% of homes69% of homes
Living areabigger than1,404 ft²75% of homes53% of homes31% of homes
Lot sizebigger than0.15 ac56% of homes30% of homes29% of homes
Year builtnewer than196056% of homes39% of homes11% of homes

About 423 Riddle Dr

How much is 423 Riddle Dr, Fort Collins, CO worth?

The TopHap Estimate for 423 Riddle Dr, Fort Collins, CO is $528,952 as of Oct 21, 2026. The likely range is $509,564 to $548,340. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 423 Riddle Dr, Fort Collins, CO last sell?

423 Riddle Dr, Fort Collins, CO last sold on Aug 6, 1999 for $127,500, according to the county's recorded deed.

How big is 423 Riddle Dr, Fort Collins, CO?

423 Riddle Dr, Fort Collins, CO has 3 bedrooms, 1 bathrooms, 1,404 square feet of living space and a 0.15-acre lot.

When was 423 Riddle Dr, Fort Collins, CO built?

423 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 423 Riddle Dr, Fort Collins, CO?

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

How does 423 Riddle Dr, Fort Collins, CO compare to other homes in Fort Collins 80521?

Among the 9,046 homes in Fort Collins 80521, it is worth more than 53% of them ($528,952 against a typical $521,623), its price per square foot is higher than 46% of them ($377 against a typical $388), it is bigger than 53% of them (1,404 ft² against a typical 1,339 ft²), its lot is bigger than 30% of them (0.15 ac against a typical 0.19 ac) and it is newer than 39% of them (1960 against a typical 1967). Measured against all of Larimer County, it is worth more than 44% 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 423 Riddle Dr, Fort Collins, CO?

The 2024 property tax bill for 423 Riddle Dr, Fort Collins, CO was $2,974. The county assessed it at $34,679.

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