Land · Colorado tax sale guide

Douglas County tax sales, Colorado

Verified

Douglas County runs its annual tax lien sale online through SRI Incorporated at zeusauction.com, and the Treasurer's Tax Lien Sale Information page is short: it gives the sale date, the 13 percent interest rate for 2026, the premium bidding rule, and payment by ACH debit from the bank account given at registration. The county's separate Treasurer's Deed page covers the post 2024 deed process, with deed auctions online through GovEase and a $1,000 application cost. The Treasurer's pages read publish no registration deadline and no deposit amount for the lien sale, so both are marked unverified on this page instead of being borrowed from the vendor's general rules or older secondary guides.

Selling office: Douglas County Treasurer

Next sale: The 2026 Internet Tax Lien Sale was held November 5, 2026 and had already run as of November 9, 2026; the 2027 sale is held in early November on the county's stated pattern, with no dated 2027 sale published as of November 9, 2026. The Treasurer's page states the 2026 Internet Tax Lien Sale was held November 5, 2026, with 2026 interest at 13 percent, and that the sale is generally held in early November, once a year in the fall, and must be held on or before the second Monday in December. Information on an upcoming sale becomes available in October, when the list of advertised properties is published. Watch the Treasurer's Tax Lien Sale Information page and zeusauction.com for the 2027 announcement.

Douglas County is a Castle Rock sale run entirely online, and the October advertising list in Colorado Community Media newspapers is the first dated signal of each year's sale. Treasurer: Douglas County Treasurer, 100 Third Street, Castle Rock, CO 80104, phone 303-660-7455.

Dates and deadlines

Sources: Douglas County Treasurer, Tax Lien Sale Information. Douglas County Treasurer, Treasurer's Deed Information. Confirm with the selling office before relying on any date on this page: sales move, terms change, and parcels are pulled up to sale day.

Research Douglas County parcels before you bid

A sale list gives you the parcels, the date, and the opening terms. It does not give you the owner, the value, or the rest of the picture: liens, foreclosure status, and parcel history. PropertyRadar is the data platform for that layer. It carries owner records, assessed and market values, foreclosure and tax data, and property history for parcels across Douglas County, searchable by address, owner, or county, including parcels that never reach a sale list.

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How Colorado tax lien sales work

• Unpaid taxes become a lien, and the lien is what sells. Property taxes in Colorado are a lien on the property, and delinquent interest accrues at 1 percent per month under CRS 39-10-104.5. When taxes stay unpaid, the county treasurer publishes the delinquent list once a week for three weeks (39-11-102) and sells the tax lien at the annual sale under Title 39, Article 11. What the buyer receives is a certificate of purchase: a lien position against the property, not the property, not a deed, and no right to enter or use it.
• The sale runs every fall, and the statute sets the outer date. The sale must begin no later than the second Monday in December (39-11-109), and each treasurer fixes the day. Counties in this set sell from late October into December, most of them in November. Most of the large counties sell online through a vendor the treasurer names; some still sell in person, and the county page says which.
• Bidding is a premium, and the premium is spent money. Under 39-11-115(1) the lien goes to the person who pays the taxes, delinquent interest and fees and bids the largest amount on top of that sum. The excess, the premium, is credited to the county general fund. It earns no interest, and it is not returned if the owner redeems. Competition in Colorado raises the price of the lien without raising its return by a cent.
• The rate is fixed by statute, and redemption is the normal exit. The certificate earns the redemption rate in 39-12-103: nine percentage points above the federal discount rate as of September 1, rounded to the nearest whole percent. For the 2026 sale that rate is 13 percent. The owner, or another interested party, may redeem at any time before a treasurer's deed is issued, and the holder may pay later delinquent taxes and endorse them onto the certificate at the same rate. Most certificates end in redemption.
• The deed runs through a public auction now. Colorado used to hand the treasurer's deed to the certificate holder on application after three years. That ended July 1, 2024 under HB 24-1056, and SB 26-144 reenacted the replacement process as Article 11.5 effective June 1, 2026. After August 1 of the third calendar year following the sale, the lawful holder applies, and the treasurer auctions a certificate of option for treasurer's deed: the opening bid covers what is owed to the holder plus treasurer fees and costs, any overbid belongs to the former owner, and if no qualifying bid is made and paid, the lawful holder is deemed the option purchaser and the deed issues to that purchaser. Liens nobody buys are struck off to the county and can later be bought by assignment.

How bidding works in Douglas County

Registration is handled by SRI Incorporated at www.zeusauction.com (Zeus Auction). Payment is tied to the registration account: winning bids are paid by ACH from the bank account provided in the registration process. A 2026 registration deadline was not published on the Treasurer's pages read.

• The premium is the price, and it buys nothing. Every dollar of premium goes to the county general fund the moment the lien sells. A small lien won with a large premium can pay back less than the taxes were worth even at a 13 percent headline rate, because the rate applies only to the certificate amount. Model premium as a fee you pay for the right to earn 13 percent on somebody else's tax bill, because that is what it is.
• The certificate is not the property. No possession, no rents, no right to enter, and no deed on application. Since 2024 the deed runs through a public auction where the owner's equity is bid for openly; buyers who need the property itself on a schedule should be reading the deed state pages, not this one.

Terms: what a bid actually costs

Unsold liens: county held certificates

Under CRS 39-11-108, liens that receive no bid are struck off to the county, and county held certificates are later available by assignment from the treasurer on county terms. The Treasurer's pages read for Douglas County do not publish an assignment list, window or fee for county held certificates, so no Douglas specific assignment terms are claimed here; contact the Treasurer's office at 303-660-7455 for the current position.

Before you bid

• Model the premium before the rate. Run the redemption case with your real premium included: certificate amount, plus premium, against 13 percent on the certificate amount alone over the likely redemption window. Liens that only work at a zero premium do not work.
• Check whether the sale is already over. Colorado's season is short and most of it lands in a few November weeks. Several sales in this set had already closed before these pages were checked. The treasurer's sale page is the live word on dates, registration, and deposits.
• Subsequent taxes are part of the position. A holder can pay later delinquent taxes on the parcel and endorse them onto the certificate at the same rate. Budget for carrying the position across the three year deed window, not just for buying it.
• Set the maximum before the sale opens. The free Max-Bid Calculator below works backwards from your exit value to the highest certificate amount you can carry, with the premium and costs shown.

Every Colorado county in this set

One page per county, each verified against its own treasurer source. Colorado has 64 counties; this set is the top 10 by population and sale volume.

• Denver tax sales
• Arapahoe County tax sales
• Jefferson County tax sales
• Adams County tax sales
• El Paso County tax sales
• Douglas County (this page)
• Larimer County tax sales
• Boulder County tax sales
• Weld County tax sales
• Mesa County tax sales

Keep going

Once a deadline puts you in a sale, the Land Investor Due Diligence Toolkit is the checklist and bid worksheet to run on each parcel before you bid. The same desk runs Florida tax deed sales, Texas tax sales, Pennsylvania tax sales, Georgia tax sales, North Carolina tax foreclosure sales, Ohio tax foreclosure sales, Illinois tax lien sales, Michigan tax foreclosure sales, Arizona tax lien sales, California tax defaulted property sales, Colorado tax lien sales and South Carolina tax sales, and the proven New York season, with the live membership, sits in the NY tax sale hub.