Wyoming property tax deadlines
8 sourced dates. 23 of 23 Wyoming counties have at least one.
Wyoming sets one calendar for every county in state law (W.S. title 39). Half the tax is due September 1 and must be paid by November 10, and the other half is due March 1 and must be paid by May 10. Late balances cost 18% a year. The statute says nothing about weekends or holidays, so check with your treasurer if a date lands on one.
Next state-wide date
Nov 10, 2026 in 18 days
Last day without penalty Pay the first half wyoleg.govOct 21
Next dates in every Wyoming county
Every state-wide date
| Date and source | Deadline | Applies to |
|---|---|---|
| March 1 every yearwyoleg.govOct 21 | Exemption filing Claim the long-term homeowner exemption | All 23 Wyoming counties |
| March 1 every yearwyoleg.govOct 21 | Bills due Second half due | All 23 Wyoming counties |
| May 10 every yearwyoleg.govOct 21 | Last day without penalty Pay the second half | All 23 Wyoming counties |
| September 1 every yearwyoleg.govOct 21 | Bills due First half due | All 23 Wyoming counties |
| November 10 every yearwyoleg.govOct 21 | Last day without penalty Pay the first half | All 23 Wyoming counties |
| December 31 every yearwyoleg.govOct 21 | Other Pay the full year by now: no first-half interest | All 23 Wyoming counties |
| Varies, see rule set by noticewyoleg.govOct 21 | Appeal deadline Object to your assessment in writing File with the county assessor within 30 days of the date your assessment was sent. They go out by the fourth Monday in April. A postmark inside the 30 days counts. | All 23 Wyoming counties |
| Varies, see rule see rulewyoleg.govOct 21 | Exemption filing Claim the veterans' exemption File a sworn claim with the county assessor by the fourth Monday in May. | All 23 Wyoming counties |