Google street view image for 909 Mapleton Ave, Boulder, CO 80304

Off market aug 1992 for $425K

$3,432,765

Est. refi paymentEst. refi $2,937/mo

•

4 ba

•

5,118

sq ft

909 Mapleton Ave, Boulder, CO 80304

About this home

909 Mapleton Ave is a 5,118 square foot house on a 0.27 acre lot with 5 bedrooms and 4 bathrooms. - it last sold on August 17, 1992 for $425,000. Based on Redfin's Boulder data, we estimate the home's value is $3,432,765.

Single-familyProperty Type

1894Year Built

0.27 acresLot Size

$671Est. Price/Sq.Ft.

Source:Public Records

Redfin Estimate

$3,432,765

$3.0M since sold in August 1992$9,000 since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 25.5% higher than the average sale price ($2.74M) of 6 comparable homes.

SOLD AUG 27, 2026
$3,295,000
A
4 beds3 baths2,463 sq ft
1013 Mapleton Ave, Boulder, CO 80304
SOLD AUG 14, 2026
$2,100,000
B
5 beds4 baths3,034 sq ft
320 Pearl St, Boulder, CO 80302
SOLD JUN 12, 2026
$1,544,000
C
4 beds3 baths2,484 sq ft
1020 Portland Pl, Boulder, CO 80304
SOLD AUG 7, 2026
$4,125,000
D
5 beds4.5 baths5,989 sq ft
2675 Dakota Pl Unit (newlands), Boulder, CO 80304
SOLD FEB 25, 2026
$2,700,000
E
4 beds3 baths3,675 sq ft
625 Concord Ave, Boulder, CO 80304
SOLD MAY 1, 2026
$2,651,475
F
5 beds4 baths3,549 sq ft
2449 5th St, Boulder, CO 80304

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Earn from this home

Sell

$3,233,640

Est. take-home

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Est. cash available

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Rent

$8,343/mo

Redfin rental estimate

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Market trends in 80304, CO

Last updated September 2026

Buyer's Market

Seller's Market

Balanced market

Sale-to-List Price

97.3%

+0.1% MoM

Median sale price

$1.4M

$0 MoM

Avg. days on market

72d

9 days MoM

Recently sold homes

118

10 MoM

New listings for sale

$1,750,000
3 beds2 baths1,446 sq ft
653 Dewey Ave, Boulder, CO 80304
NEW 17 HRS AGO
$4,495,000
4 beds3.5 baths5,026 sq ft
3746 Wonderland Hill Ave, Boulder, CO 80304
OPEN OCT 17, 11AM TO 1PM
$1,499,000
3 beds2 baths2,240 sq ft
2140 Mesa Dr, Boulder, CO 80304
NEW 20 HRS AGO
$595,000
2 beds2 baths892 sq ft
948 North St #17, Boulder, CO 80304
AJ Chamberlin • Colorado Legacy Real Estate
NEW 20 HRS AGO
$599,900
3 beds2 baths1,632 sq ft
3785 Birchwood Dr #69, Boulder, CO 80304
COMING SOON
$4,975,000
5 beds5.5 baths4,687 sq ft
661 Maxwell Ave, Boulder, CO 80304
OPEN TODAY, 10AM TO 12PM
$1,695,000
3 beds2.5 baths1,648 sq ft
2251 Bluff St, Boulder, CO 80304
3D WALKTHROUGH
$6,500,000
3 beds3.5 baths4,065 sq ft
250 Cactus Ct, Boulder, CO 80304
$1,500,000
4 beds3 baths2,957 sq ft
1280 N Cedar Brook Rd, Boulder, CO 80304
OPEN OCT 17, 11AM TO 1PM
$1,650,000
3 beds4 baths2,926 sq ft
515 Quail Cir, Boulder, CO 80304
See all

Provided by Redfin

Sale history for 909 Mapleton Ave

Year

Property tax

Land + Additions

Assessment*

2025

$20,141 (+13.6%)

$122,075 + $95,406

$217,481

2024

$17,728 (+1.8%)

$122,075 + $95,406

$217,481

2023

$17,420 (−2.5%)

$125,833 + $82,584

$208,417

2022

$17,865 (+4.9%)

$129,518 + $82,584

$212,102

2021

$17,035 (+11.9%)

$94,881 + $104,445

$199,326

2020

$15,218 (−2.4%)

$97,612 + $107,450

$205,062

2019

$15,598 (+9.6%)

$88,446 + $93,536

$181,982

2018

$14,233 (+3.2%)

$88,446 + $93,536

$181,982

2017

$13,788 (+15.3%)

$79,992 + $84,175

$164,167

2016

$11,963 (+5.6%)

$79,992 + $84,175

$164,167

2015

$11,328 (+25.9%)

$71,322 + $66,880

$138,202

2014

$8,999 (+2.2%)

$39,800 + $64,874

$104,674

2013

$8,801 (+2.3%)

$39,800 + $64,874

$104,674

2012

$8,602 (+0.9%)

$39,800 + $64,874

$104,674

2011

$8,526 (+0.8%)

$31,840 + $70,844

$102,684

2010

$8,457 (+7.1%)

$31,840 + $70,844

$102,684

2009

$7,896

$46,520 + $58,110

$104,630

Tax history for 909 Mapleton Ave

Year

Property tax

Land + Additions

Assessment*

2025

$20,141 (+13.6%)

$122,075 + $95,406

$217,481

2024

$17,728 (+1.8%)

$122,075 + $95,406

$217,481

2023

$17,420 (−2.5%)

$125,833 + $82,584

$208,417

2022

$17,865 (+4.9%)

$129,518 + $82,584

$212,102

2021

$17,035 (+11.9%)

$94,881 + $104,445

$199,326

2020

$15,218 (−2.4%)

$97,612 + $107,450

$205,062

2019

$15,598 (+9.6%)

$88,446 + $93,536

$181,982

2018

$14,233 (+3.2%)

$88,446 + $93,536

$181,982

2017

$13,788 (+15.3%)

$79,992 + $84,175

$164,167

2016

$11,963 (+5.6%)

$79,992 + $84,175

$164,167

2015

$11,328 (+25.9%)

$71,322 + $66,880

$138,202

2014

$8,999 (+2.2%)

$39,800 + $64,874

$104,674

2013

$8,801 (+2.3%)

$39,800 + $64,874

$104,674

2012

$8,602 (+0.9%)

$39,800 + $64,874

$104,674

2011

$8,526 (+0.8%)

$31,840 + $70,844

$102,684

2010

$8,457 (+7.1%)

$31,840 + $70,844

$102,684

2009

$7,896

$46,520 + $58,110

$104,630

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Zoning and permits

Zoning
Permits

RL-1

Residential-Low 1 District

Primarily single-family detached dwelling units with some duplexes and attached dwelling units at low to very low residential densities.

Permitted uses

Include but are not limited to:

Religious facility
Housing-Multiple units
Educational/school
Recreation
Agriculture-Cropland
Park & open space

Property details

Interior

Basement Information
Basement Sq. Ft: 1,322
Basement Finish: Finished
Basement Type: Finished

Bathroom Information
# of Full Baths: 2
# of 1/2 Baths: 2
# of 3/4 Baths: 1

Heating & Cooling
Heating Type: Forced Air

Room Information
# of Rooms: 9

Exterior

Exterior Information
Physical Condition: Very Good
Construction Type: Frame
Building Construction Quality: Good
Exterior Wall: Frame Wood
Roof Covering Type: Asphalt
Roof Shape Type: Asphalt
Building Type: Single Family

Property Information
Subdivision Name: PLEASANT CORNER
Living Sq. Ft: 5,118
Ground Floor Sq. Ft: 2,001
Building Sq. Ft: 5,118
Stories Type: 2 Plus
Legal Description: LOT 1 PLEASANT CORNER SPLIT SEE ID 106540

Parking & Garage Information
Parking Type: Carport
Garage/Parking Sq. Ft: 490
Garage / Carport Type: Carport

Lot Information
# of Buildings: 1
Land Sq. Ft: 11,729
Legal Lot Number: 1
Municipality Name: BOULDER
Acres: 0.2693
County Use Description: 1 FAMILY RESID

Financial

Assessor Information
Assessment Year: 2025
Tax Area: RE2-BLDR-NCWD-UDFC

Public facts

Beds: 5
Baths: 4.0
Sq. Ft.: 5,118
Stories: —
Lot Size: 0.27 acres
Style: Single Family Residential
Year Built: 1894
Year Renovated: 1995
County: Boulder County
APN: R0001867

Home facts updated by county records on Sep 2, 2026

Around this home

Schools

Whittier Elementary School

Public K-5 • Assigned • 0.8mi

6/10

Casey Middle School

Public 6-8 • Assigned • 0.3mi

5/10

Boulder High School

Public 9-12 • Assigned • 0.7mi

9/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

4/10 Fire Factor

2% chance of being in a wildfire in next 30 years

3/10 Heat Factor

7 days above 90° expected this year, 19 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

2/10 Air Factor

2 unhealthy days expected this year, 2 days in 30 years

Provided by First Street

Historical weather

Boulder, CO • 80304

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 10.5 hours in June and 6 hours in December, placing it above the U.S. average for solar exposure.

10.5 hrs

6 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$3.26M – $3.95M

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Nearby similar homes

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New listings for sale in 80304

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NEW 17 HRS AGO3D & VIDEO TOUR

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OPEN OCT 17, 11AM TO 1PM3D WALKTHROUGH

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NEW 20 HRS AGO3D WALKTHROUGH

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NEW 20 HRS AGO

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OPEN TODAY, 10AM TO 12PM

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3D WALKTHROUGH

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Home values near 909 Mapleton Ave

Data from public records.

Address	Redfin Estimate
839 Mapleton Avenue, Boulder, CO 2 Beds \| 1.5 Baths \| 2408 Sq. Ft.	$1,949,220
1001 Mapleton Avenue, Boulder, CO 5 Beds \| 3.5 Baths \| 5849 Sq. Ft.	$4,556,923

Address	Redfin Estimate
936 Mapleton Avenue, Boulder, CO 4 Beds \| 2 Baths \| 2626 Sq. Ft.	$3,287,651
928 Mapleton Avenue, Boulder, CO 3 Beds \| 2.5 Baths \| 2316 Sq. Ft.	$2,318,746

Address	Redfin Estimate
1013 Mapleton Avenue, Boulder, CO 4 Beds \| 3 Baths \| 2463 Sq. Ft.	$3,214,248
1002 Mapleton Avenue, Boulder, CO 6 Beds \| 4.5 Baths \| 6914 Sq. Ft.	$10,670,181

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 80304, CO

Sale history for 909 Mapleton Ave

Tax history for 909 Mapleton Ave

Zoning and permits

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 80304

Home values near 909 Mapleton Ave

More real estate resources