Arapahoe County, Colorado property-tax payment and appeal deadlines
Tax bills, payment rules, and valuation-review windows are controlled by the local jurisdiction and the governing state framework. The reviewed record below separates published figures from items that still require confirmation with Arapahoe County Assessor.
Rate context
ConfirmColorado property tax is based on local mill levies and statutory assessment rates that vary by tax area; no single current effective countywide percentage was published in the official county sources reviewed.
Statement mailing
PublishedJanuary 2027; Colorado county treasurers mail annual property-tax notices in January for taxes payable in the new year; the exact 2027 mailing date was not published in the official source reviewed.
Payment deadline
PublishedFor 2026 property taxes payable in 2027: taxes are due January 1, 2027; amounts over $25 may be paid in two equal installments, with the first half due by February 28, 2027 and the second half by June 15, 2027, or paid in full by April 30, 2027. Colorado county treasurers apply delinquent interest after the applicable deadline.
Valuation protest
PublishedMay 1 through June 8, 2026 for 2026 real-property valuation appeals; the appeal must be filed by June 8.
Do not assume a grace period.
The reviewed record identifies the payment timing above but does not establish a universal penalty schedule for this page. Late charges, interest, collection costs, tax-sale procedures, and lien or foreclosure timelines can depend on state law and the local collector’s process. If the deadline is close or a balance is delinquent, contact the tax collector directly and request the current payoff amount in writing.
Treat a published payment deadline as a hard operational date and retain your receipt or confirmation number.
From assessment to collection
01Valuation and notice
Review the assessment notice as soon as it arrives. The protest window may run from the notice date rather than from the payment due date.
02Statement and account review
Match the tax statement to the parcel or account number and confirm exemptions, assessed value, taxing units, credits, and balance.
03Payment confirmation
Use the official collector channel, then save the receipt, transaction reference, and date posted. A bank submission is not always the same as a county posting date.