Off-market property records in Boulder County, CO

By the numbers

What Boulder County’s records hold

Parcels in the hunt	109,281 parcels the county files as homes or residential land in Boulder County.
Tax bill mailed elsewhere	28,149 of the 66,392 with a mailing address on file (42%) send the tax bill to an address other than the property.
Mailed out of state	3,787 (6%) send it outside Colorado.
Years since the last sale	Median 12.3 years, from 105,859 parcels with a recorded sale: under 5 years 21,824, 5 to 9 22,575, 10 to 19 25,512, 20 or more 35,948.

Source: shinnslist (county records), read October 16, 2026. How the counts are made and graded: How we grade. Nothing here predicts that an owner will sell. These are counts of public county records.

Tax lien sale

Boulder County’s 2026 tax lien sale

2026 sale	November 13, 2026, in person.
Interest	A Colorado lien earns 13% a year in 2026 until the owner pays it off: the federal discount rate on September 1 plus nine points.
What a lien buys	The right to be repaid with interest, not the property. If the taxes stay unpaid for three years, the lien holder can apply for a treasurer’s deed.

Source: Boulder County Treasurer, read October 21, 2026; C.R.S. 39-11-109. Not legal or investment advice.

Housing

Boulder County’s housing, from the Census

Housing units	144,729, of which 7,721 (5%) stood vacant; 1,916 (1%) are seasonal or second homes.
Owner-occupied	62% of occupied homes; the rest are rented.
Median home value	$756,300, as owners reported it.
Median gross rent	$1,966 a month, utilities included.
Median year built	1986.

Source: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, tables B25002, B25003, B25004, B25077, B25064, B25035.

Trades

Matches for each trade in Boulder County

Wholesaler	642 owners whose mail goes elsewhere, held 10+ years, bought for under half of today’s value. Open the Wholesaler list
STR investor	513 mountain-town homes whose owner’s mail goes elsewhere. Open the STR investor list
Realtor	481 long-held homes on the county’s tax lien sale list, with an estate on title or a recent estate record, a county code violation, or a stalled building permit. Open the Realtor list
Flipper	1,029 dated homes where updated ones nearby sold for 30%+ more per square foot. Open the Flipper list
Developer	109 lots where the county says the land is 70%+ of the value. Open the Developer list
Cash investor	613 homes where a year of the area’s median rent is 8% to 15% of the county’s value. Open the Cash investor list
Fix and rent	1,025 dated homes, ranked by the area’s median rent against the county’s value. Open the Fix and rent list
Land	3,183 empty residential lots and acreage, with no house on the county’s record. Open the Land list
Family compound	24,757 room for two families without building new: two homes, a duplex to fourplex, a garage, barn or shop to convert, a walk-out basement. Open the Family compound list

Towns

Towns in Boulder County

Recorded sales

The last twelve months of recorded sales

October 2025	411 recorded sales, median $735,000
November 2025	290 recorded sales, median $770,000
December 2025	348 recorded sales, median $695,000
January 2026	149 recorded sales, median $800,000
February 2026	194 recorded sales, median $795,000
March 2026	264 recorded sales, median $800,000
April 2026	290 recorded sales, median $862,000
May 2026	297 recorded sales, median $830,000
June 2026	333 recorded sales, median $837,000
July 2026	284 recorded sales, median $821,000
August 2026	212 recorded sales, median $828,000
September 2026	160 recorded sales, median $769,000

Each parcel counts once, in the month of its most recent recorded sale. Medians use sales of $10,000 or more, and only where 10 or more sales back them.

Guides

Do it yourself in Boulder County

Questions

Boulder County, answered from the records