Grinnell Ave, Boulder, CO Property Records

Boulder County property records for 29 addresses on Grinnell Ave, Boulder, CO · Last verified August 2026

Grinnell Ave Highlights

Properties 29
Median Sale Price $1,325,000
Deeds and Mortgages on File 45
Median Price per Sqft $542
Owner Occupied 86%
Median Annual Tax Bill $6,623
Median Year Built 1966
Median Ownership Tenure 20 years

Properties on Grinnell Ave

Owner names and prior sale amounts shown locked below are available instantly with a free trial.

4215 Grinnell Ave

12,500 sqft · Built 1980 · 2.26 acres

Last Sale Tax Bill Prior Sale Owner Records
—Jul 1987 —Feb 1965 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

4220 Grinnell Ave

3 bd · 1.75 ba · 1,794 sqft · 0.167 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$42,000Oct 1974 $6,1362025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

4230 Grinnell Ave

3 bd · 1.75 ba · 1,904 sqft · 0.164 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$6,7222025 2 Names on Record AssessorUpdated Jul 2026

4235 Grinnell Ave

4 bd · 2 ba · 1,800 sqft · 0.283 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$617,000Aug 2014 $6,4442025 Sale Amount Oct 2010 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

4240 Grinnell Ave

4 bd · 2.25 ba · 2,406 sqft · 0.166 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,100,000May 2017 $8,8112025 Sale Amount Jun 1991 2 Names on Record Owner Occupied Assessor + 5 DocumentsUpdated Jun 2026

4250 Grinnell Ave

3 bd · 3.75 ba · 2,616 sqft · 0.167 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,130,000Oct 2020 $8,9582025 Sale Amount Oct 1981 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Jun 2026

4260 Grinnell Ave

3 bd · 1.75 ba · 1,679 sqft · 0.167 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$43,500Sep 1976 $6,2432025 —Jul 2014 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

4265 Grinnell Ave

4 bd · 2.5 ba · 1,934 sqft · 0.236 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,050,000Oct 2024 $6,6232025 —Sep 1980 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Aug 2026

4270 Grinnell Ave

3 bd · 1 ba · 1,903 sqft · 0.165 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
—Jan 1993 $6,0882025 —Dec 1984 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

4275 Grinnell Ave

3 bd · 1.75 ba · 1,881 sqft · 0.2 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$369,900Jan 2002 $6,1192025 —Aug 1993 1 Name on Record AssessorUpdated Jun 2026

4280 Grinnell Ave

5 bd · 3.25 ba · 2,872 sqft · 0.214 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,372,700Oct 2018 $9,6622025 Sale Amount Aug 2006 2 Names on Record Owner Occupied Assessor + 9 DocumentsUpdated Aug 2026

4285 Grinnell Ave

3 bd · 1.75 ba · 1,714 sqft · 0.184 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
—Aug 1967 $5,0552025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

4315 Grinnell Ave

3 bd · 2.25 ba · 2,422 sqft · 0.174 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
—Aug 1992 $5,2932025 Sale Amount Dec 1986 1 Name on Record AssessorUpdated Jun 2026

4320 Grinnell Ave

3 bd · 6.75 ba · 2,682 sqft · 0.184 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$925,000Jan 2020 $9,0162025 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

4325 Grinnell Ave

3 bd · 1 ba · 988 sqft · 0.175 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$310,000Sep 2003 $4,5652025 Sale Amount Dec 1999 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

4365 Grinnell Ave

4 bd · 1.75 ba · 1,976 sqft · 0.173 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$214,000Jun 1998 $5,2542025 —Sep 1992 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

4395 Grinnell Ave

5 bd · 2 ba · 1,888 sqft · 0.175 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$439,500Sep 2006 $6,3232025 Sale Amount Jun 1998 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

4415 Grinnell Ave

5 bd · 2.75 ba · 2,763 sqft · 0.163 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$188,000Dec 1995 $7,9492025 —Aug 1993 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

4430 Grinnell Ave

3 bd · 1.5 ba · 1,308 sqft · 0.179 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$34,000Dec 1973 $5,3392025 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

4435 Grinnell Ave

3 bd · 1.5 ba · 1,280 sqft · 0.163 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
—May 1973 $4,9012025 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

4440 Grinnell Ave

4 bd · 2 ba · 2,216 sqft · 0.166 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$461,900Jun 2011 $7,1672025 Sale Amount Nov 1993 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Aug 2026

4445 Grinnell Ave

4 bd · 1.75 ba · 1,832 sqft · 0.167 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,622,000Mar 2026 $7,2342025 Sale Amount Jul 2016 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Jul 2026

4450 Grinnell Ave

3 bd · 1.5 ba · 1,976 sqft · 0.154 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$555,000May 2013 $7,1532025 Sale Amount Aug 2007 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jun 2026

4465 Grinnell Ave

5 bd · 3.25 ba · 2,068 sqft · 0.164 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,375,000Jun 2021 $8,1732025 Sale Amount Jul 2016 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

4470 Grinnell Ave

5 bd · 3 ba · 1,908 sqft · 0.188 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$483,500Mar 2010 $7,9112025 —Nov 2009 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

4475 Grinnell Ave

4 bd · 1.75 ba · 1,762 sqft · 0.174 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
—Dec 1990 $5,1362025 Sale Amount May 1976 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

4480 Grinnell Ave

5 bd · 3 ba · 2,132 sqft · 0.178 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,325,000Feb 2024 $7,4022025 Sale Amount Jul 2016 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Aug 2026

4495 Grinnell Ave

3 bd · 1 ba · 1,134 sqft · 0.208 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$5,7382025 —Feb 2003 2 Names on Record AssessorUpdated Jun 2026

4497 Grinnell Ave

5 bd · 3.25 ba · 2,798 sqft · 0.217 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,020,000Jan 2022 $6,8962025 Sale Amount Nov 1990 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

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