Boulder County, Colorado Tax Sales

Counties / Colorado counties / Boulder County

Quick answerBoulder County, Colorado follows Colorado tax sale law: the state sells tax lien certificates for delinquent property taxes. Rate / penalty: Federal discount rate (Federal Reserve Bank of Kansas City) in effect Sept. 1 plus 9 percentage points, rounded to the nearest whole percent, set Oct. Redemption: Owner may redeem at any time before issuance of a treasurer's deed / completion of the treasurer's deed public auction. LienToDeed ingests this county's published sale list live; the state rules below are the law that governs its sales.

How tax sales work in Boulder County, Colorado

Colorado law controls every tax sale in Boulder County — the county runs the sale, but what is sold, what it pays and how long the owner can redeem are all set by the state:

What Colorado sells	Tax lien certificates
Interest / penalty	Federal discount rate (Federal Reserve Bank of Kansas City) in effect Sept. 1 plus 9 percentage points, rounded to the nearest whole percent, set Oct. 1 and fixed for the life of the certificate (C.R.S. §39-12-103) — e.g. 14% for certificates in the Oct. 1, 2025-Sept. 30, 2026 period, 13% announced by El Paso County for its 2026 sale (a county announcement; the statewide rate is whatever the formula sets each Oct. 1). Interest accrues only on taxes/subsequent taxes, not on any premium bid
Redemption period	Owner may redeem at any time before issuance of a treasurer's deed / completion of the treasurer's deed public auction; the lienholder may apply for that auction no sooner than 3 years from the date of the tax lien sale (C.R.S. §§39-12-103, 39-11.5-102)
When sales happen	Annual county treasurer tax lien sales in the fall, typically October-November (most counties in November)
Governing law	Colorado Revised Statutes Title 39, Articles 11 and 12 (§§39-11-101 et seq., 39-12-103) and Article 11.5 (§§39-11.5-101 et seq.) for treasurer's deed auctions
County (Census)	Boulder County — county, Colorado · FIPS 08013

Premium bidding: the winning premium over the lien amount is not refunded on redemption and earns no interest, so effective yield is below the headline rate. HB 24-1056 (eff. July 1, 2024) replaced automatic issuance of a treasurer's deed with a public auction of a certificate of option for treasurer's deed, so surplus value can return to the former owner.

The process, step by step

1 · The list publishes. Colorado sales run on this rhythm: Annual county treasurer tax lien sales in the fall, typically October-November (most counties in November) The county's sale list — the parcels actually being sold — is published ahead of the sale by the county office that runs it, and in many Colorado counties also through the state's sale channels (Online via RealAuction, GovEase, SRI Inc., and Zeus Auction depending on the county; some counties still hold in-person sales — see the Colorado County Treasurers' association sale list for the county-by-county split).

2 · Register and fund — before sale day. Registration and bidder deposits are handled by the county or its sale platform and close before the sale, in most counties the day before. The amount and ID requirements are set in the county's own sale notice, not in state law — confirm them on the current published notice before you rely on them.

3 · Research every parcel. Compare the taxes owed against assessed value and recorded sales, check property type and occupancy signals, and price in the state's redemption rule above: it decides whether your money comes back with the statutory return, or your path runs to the property itself.

4 · Bid the number you wrote down. Set your max bid (deeds) or floor rate (liens) from the research, before the sale opens. The state's return is paid on the tax obligation — not on whatever extra a bidding war adds on top of it.

5 · After the sale. Owners redeem inside the window above; lists change as they do. Track the parcels you care about, because a watched property redeeming or withdrawing is information you want before — not after — you wire a deposit for the next sale.

What Boulder County publishes — live feed

LienToDeed ingests this county's sale list directly from its published source: Boulder County Treasurer published Tax Lien Sale list (Accounts Advertised for Tax Lien Sale XLSX). Every new listing is scored as it posts, and watched properties that redeem or withdraw are flagged before sale day.

Coverage status: Boulder County — live alerts active

Paid members are alerted when new Boulder County properties are listed — and if a watched property redeems before the sale.

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County facts (name, state, FIPS 08013) from the US Census Bureau county list; state rules verified 2026-10-30 — sources on the Colorado law page. Educational only, not investment advice.