What is the Auction Date of a US Treasury Bill?

Auction Date of a US Treasury Bill (T-Bill) is the date when the T-Bill was auctioned by The US Department of the Treasury.

4-week, 6-week, 8-week, 13-week, 17-week, and 26 week T-Bills are auctioned each week,. and 52-week T-Bills are auctioned every 4 weeks. Their announcement, auction and issue timing are provided below.

4-Week and 8-Week T-Bill Generally announced Tuesday of each week, auctioned 2 days later on Thursday, and issued 5 days later on following Tuesday.

6-Week T-Bill Generally announced Thursday of each week, auctioned 5 days later on following Tuesday, and issued 2 days later on Thursday.

13-Week and 26-Week T-Bill Generally announced Thursday of each week, auctioned 4 days later on following Monday, and issued 3 days later on Thursday.

17-Week T-Bill Generally announced Tuesday of each week, auctioned 1 day later on Wednesday, and issued 6 days later on following Tuesday.

52-Week T-Bill Generally announced Thursday every four weeks, auctioned 5 day later on following Tuesday, and issued 2 days later on Thursday.

If an auction day is a holiday, it will be delayed to the next business day.

Here is an example of 26-week T-Bill that was auctioned on January 21, 2025:

CUSIP: 912797PF8
Term: 26-Week 

Jan 16, 2025 (Thu) - Announcement date 
Jan 21, 2025 (Tue) - Auction date 
Jan 23, 2025 (Thu) - Issue date 

Here is an example of 52-week T-Bill that was auctioned on April 15, 2025:

CUSIP: 912797QD2
Term: 52-Week 

Apr 10, 2025 (Thu) - Announcement date 
Apr 15, 2025 (Tue) - Auction date 
Apr 17, 2025 (Thu) - Issue date 

⇒ Auction Result of US Treasury Bill

⇐ Recently Issued US Treasury Bills

⇑ Introduction of US Treasury Bills

⇑⇑ US Treasury Securities