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Single Family ResidenceResidential
$651,502$216 / 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 Sep 24, 2026
Last sold for $446,000 on Mar 4, 2019

521 RIDER RIDGE DR

LONGMONT, CO 80504
3
Beds
2.5
Baths
3,015 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.
0.19 ac
Lot SizeThe size of the land the home sits on, from county records.
1995
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$652K
$634K low$669K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$446,000 · Mar 4, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,771 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$49,450 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$12,281
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$37,169
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$45,451
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$727,200

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.A-Frame
CountyBOULDER
Lot (acres)The size of the land the home sits on, from county records.0.19
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Central
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.Deck · 102 ft²Porch · 171 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
Rocky Mountain Elementary SchoolC+
Elementary · Grades PK–5 · 0.1 mi
H
Skyline High SchoolD+
High · Grades 9–12 · 1.0 mi
M
Trail Ridge Middle SchoolC-
Middle · Grades 6–8 · 1.1 mi

District: St. Vrain Valley School District Re 1j

Neighborhood · ZIP 80504These 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.67
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.99
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.45

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.64,420
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.637 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$110,047
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$129,711
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.14 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

521 Rider Ridge 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 75% of homes in North Half of Southwest Longmont
  • Costs less per square foot than 97% of homes in Boulder County
  • Bigger than 84% of homes in North Half of Southwest Longmont
  • Has a bigger lot than 67% of homes in North Half of Southwest Longmont
  • Older than 77% of homes in Longmont 80504

What homes are worth in Longmont 80504

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

This home
$321K$1.7M

This home is worth more than 71% of homes in Longmont 80504.

How it measures up in Longmont 80504

The dot is this home. The mark in the middle is the typical home in Longmont 80504.

Estimated value$651,502
CheaperTypical $570,687Pricier

Pricier than 71% of homes nearby

Price per ft²$216
CheaperTypical $274Pricier

Pricier than 14% of homes nearby

Living area3,015 ft²
SmallerTypical 2,039 ft²Bigger

Bigger than 83% of homes nearby

Lot size0.19 ac
SmallerTypical 0.17 acBigger

Bigger than 61% of homes nearby

Year built1995
OlderTypical 2002Newer

Newer than 23% of homes nearby

How 521 Rider Ridge Dr ranks against every home in each area.
MeasureThis homeNorth Half of Southwest LongmontLongmont 80504Boulder County
Estimated valuepricier than$651,50275% of homes71% of homes41% of homes
Price per ft²pricier than$21614% of homes14% of homes3% of homes
Living areabigger than3,015 ft²84% of homes83% of homes80% of homes
Lot sizebigger than0.19 ac67% of homes61% of homes56% of homes
Year builtnewer than199546% of homes23% of homes66% of homes

About 521 Rider Ridge Dr

How much is 521 Rider Ridge Dr, Longmont, CO worth?

The TopHap Estimate for 521 Rider Ridge Dr, Longmont, CO is $651,502 as of Sep 24, 2026. The likely range is $634,111 to $668,893. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 521 Rider Ridge Dr, Longmont, CO last sell?

521 Rider Ridge Dr, Longmont, CO last sold on Mar 4, 2019 for $446,000, according to the county's recorded deed.

How big is 521 Rider Ridge Dr, Longmont, CO?

521 Rider Ridge Dr, Longmont, CO has 3 bedrooms, 2.5 bathrooms, 3,015 square feet of living space and a 0.19-acre lot.

When was 521 Rider Ridge Dr, Longmont, CO built?

521 Rider Ridge Dr, Longmont, CO was built in 1995, making it 31 years old. It is a a-frame home. The building has 2 stories.

What schools serve 521 Rider Ridge Dr, Longmont, CO?

521 Rider Ridge Dr, Longmont, CO is assigned to Rocky Mountain Elementary School (elementary), rated C+; Skyline High School (high), rated D+; Trail Ridge Middle School (middle), rated C-. All sit in St. Vrain Valley School District Re 1j. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 Rider Ridge Dr, Longmont, CO compare to other homes in Longmont 80504?

Among the 21,631 homes in Longmont 80504, it is worth more than 71% of them ($651,502 against a typical $570,687), its price per square foot is higher than 14% of them ($216 against a typical $274), it is bigger than 83% of them (3,015 ft² against a typical 2,039 ft²), its lot is bigger than 61% of them (0.19 ac against a typical 0.17 ac) and it is newer than 23% of them (1995 against a typical 2002). Measured against all of Boulder County, it is worth more than 41% 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 521 Rider Ridge Dr, Longmont, CO?

The 2025 property tax bill for 521 Rider Ridge Dr, Longmont, CO was $4,771. The county assessed it at $49,450.

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