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4285 Grinnell Ave, Boulder, CO 80305 Property Records

Boulder County property record for 4285 Grinnell Ave, Boulder, CO 80305

Property Summary

Property TypeSingle Family Home
Details3 bd · 1.75 ba · 1,714 sqft · built 1967
Lot Size0.184 acres (8,032 sqft)
OwnerIndividual Name on File
Tax Bill$5,055 (2025)
Deeds & MortgagesMar 2024 Sale
Flood ZoneZone X (minimal risk)
APN1577-08-4-07-032

Property Details

APN / Parcel Number

Primary APN1577-08-4-07-032
Alternative APNs
  • R0014200
  • 0014200

Interior

Bedrooms3 Beds
Full Baths1.75 Baths
Half Baths1 Half Bath
Total Rooms6 Rooms
Building Area1,714 sqft Living Area
Gross Area2,098 sqft
1st Floor Area946 sqft
Basement Area864 sqft
Finished Basement768 sqft
Unfinished Basement96 sqft
Interior WallsWallboard/Drywall

Exterior

Year BuiltBuilt 1967
Effective Year BuiltEffective 1967
Architectural StyleBi-Level
Exterior MaterialWood Shingle
Construction TypeFrame
Lot Area8,032 sqft (0.184 acres)
Garage TypeAttached
Garage Area288 sqft
Parking Spaces1 Parking Space
Deck Area72 sqft

Utilities, Heating & Cooling

Heating SystemForced Air with A/C

Location & Zoning

Account NumberR0014200
Street Address4285 GRINNELL AVE
CityBOULDER
StateCO
Zip80305-6608
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionLOT 32 BLK 18 TABLE MESA 2
Legal Range70
Legal Township1S
Legal Section08
Legal SubdivisionTABLE MESA 2
Legal Block18
Legal Lot Number32
JurisdictionBOULDER CO
Township / Civil DivisionBOULDER
Census Block Group1
Census Block1015
Census Tract12509

Owner

4285 Grinnell Ave is owned and occupied by an individual who acquired it in February 2024.

Source: Boulder County records, as of September 18, 2026

Owner of RecordIndividual Name on File
Mailing Address4285 GRINNELL AVE, BOULDER, CO 80305-6608
OccupancyOwner Occupied
Owner TypeIndividual

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed NamesName on Deed
Last SaleAug 23, 1967
Deed SaleAug 23, 1967
Deed Document Number196790856078
Last Transfer DateFeb 22, 2024
Transfer Doc0004039267
Record UpdatedOct 29, 2026

March 2024: Warranty Deed, Transfer

Document TypeWarranty Deed
JurisdictionBOULDER CO
Recording DateMar 11, 2024
Property Address4285 GRINNELL AVE, BOULDER, CO 80305-6608
Document Number0004039267
Instrument DateFeb 22, 2024
Instrument4039267
Transaction TypeTransfer
Record UpdatedApr 4, 2024

Transaction

Tax$0.00
Amount AccuracyNo Consideration Stated
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name
Address4285 GRINNELL AVE, BOULDER, CO 80305-6608

Transferred To (Grantee/Buyer)

NameVerified Name
Address4285 GRINNELL AVE, BOULDER, CO 80305-6608

Tax Assessment & Valuation

The 2025 property tax bill for 4285 Grinnell Ave was $5,055.

Source: Boulder County assessment roll, as of September 18, 2026

Property Jurisdictions

TypeName
StateColorado
CountyBoulder County
MunicipalityBoulder City
Unified School DistrictBoulder Valley School District RE-2 (PK - 12)

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2026$59,731 (+0.77%) Land $52,448 Building $7,283$948,400 (-) Land $841,300 Building $107,100
2025$5,055.00$59,275 Land $52,581 Building $6,694$948,400 Land $841,300 Building $107,100
2023$4,885.00 (+4.94%)$66,953 (+17.29%) Land $60,039 Building $6,914$999,300 (+21.67%) Land $896,100 Building $103,200
2022$4,655.00$57,081 Land $48,407 Building $8,674$821,300 Land $696,500 Building $124,800

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 4285 Grinnell Ave in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 1998.

Source: FEMA National Flood Hazard Layer, effective October 14, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Community Rating SystemClass 5 (25% premium discount)
Nearby Flood Policies7 in force
Nearby Flood Claims1 (1998)
Claims Outside the SFHA1 of 1
Most Recent ClaimFeb 1998 · tidal / storm surge

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

Wildfire risk around 4285 Grinnell Ave is moderate, ranking above 62% of the US, with a 0.3% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire RiskModerate
above 62% of the US · above 50% of Colorado
Wildfire Likelihood0.3% annual chance
ExposureIndirect
within ember reach
Adjoins Burnable LandYes

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water SystemCITY OF BOULDER
serves 166,080 people · EPA ID CO0107152
Water SourceSurface water
Last State InspectionSep 2024
Lead2 ppb (2023–2025)
action level 15 ppb

Violations Reported to EPA

Water QualityHaloacetic acids
resolved · Jul 2017
Treatment and ProcedureNone
last 10 years
Monitoring and Reporting1
last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 604 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Ayva Networks
Fixed Wireless		2,500 / 2,500
CenturyLink
Fiber		2,000 / 1,000
Xfinity
Cable		2,000 / 250
Verizon
Fixed Wireless		300 / 20
LiveWireNet
Fixed Wireless		250 / 100

May also be available: AT&T, T-Mobile.

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