September 9, 2026 · last fitted close

1 year US Treasury rate

The zero-coupon rate at this maturity, fitted from the cashflow schedules of the securities outstanding on each day.

Rate
4.194%
+2.3 bp on the day

Where it sits in 18 years

4.194% today
0.065% low · Feb 5, 20215.409% high · Oct 3, 2023

Today’s rate is higher than 87.3% of the 4,508 trading days fitted since September 2, 2008. That is a count of days, not a position on the scale above: a rate can sit near the top of its range while only a few days ever reached it.

Every month since September 2, 2008

0%1%2%3%4%5%6%Sep 30, 2008Sep 9, 2026Sep 30, 20081 year rate1.712%Oct 31, 20081 year rate1.291%Nov 28, 20081 year rate0.673%Dec 31, 20081 year rate0.365%Jan 30, 20091 year rate0.528%Feb 27, 20091 year rate0.681%Mar 31, 20091 year rate0.530%Apr 30, 20091 year rate0.505%May 29, 20091 year rate0.486%Jun 30, 20091 year rate0.556%Jul 31, 20091 year rate0.555%Aug 31, 20091 year rate0.461%Sep 30, 20091 year rate0.420%Oct 30, 20091 year rate0.386%Nov 30, 20091 year rate0.277%Dec 31, 20091 year rate0.539%Jan 29, 20101 year rate0.329%Feb 26, 20101 year rate0.350%Mar 31, 20101 year rate0.442%Apr 30, 20101 year rate0.462%May 31, 20101 year rate0.392%Jun 30, 20101 year rate0.330%Jul 30, 20101 year rate0.294%Aug 31, 20101 year rate0.303%Sep 30, 20101 year rate0.280%Oct 29, 20101 year rate0.239%Nov 30, 20101 year rate0.278%Dec 31, 20101 year rate0.285%Jan 31, 20111 year rate0.272%Feb 28, 20111 year rate0.288%Mar 31, 20111 year rate0.331%Apr 29, 20111 year rate0.231%May 31, 20111 year rate0.194%Jun 30, 20111 year rate0.206%Jul 29, 20111 year rate0.264%Aug 31, 20111 year rate0.107%Sep 30, 20111 year rate0.154%Oct 31, 20111 year rate0.135%Nov 30, 20111 year rate0.132%Dec 30, 20111 year rate0.121%Jan 31, 20121 year rate0.135%Feb 29, 20121 year rate0.194%Mar 30, 20121 year rate0.219%Apr 30, 20121 year rate0.184%May 31, 20121 year rate0.226%Jun 29, 20121 year rate0.252%Jul 31, 20121 year rate0.164%Aug 31, 20121 year rate0.175%Sep 28, 20121 year rate0.176%Oct 31, 20121 year rate0.212%Nov 30, 20121 year rate0.212%Dec 31, 20121 year rate0.169%Jan 31, 20131 year rate0.161%Feb 28, 20131 year rate0.173%Mar 28, 20131 year rate0.171%Apr 30, 20131 year rate0.132%May 31, 20131 year rate0.156%Jun 28, 20131 year rate0.188%Jul 31, 20131 year rate0.118%Aug 30, 20131 year rate0.158%Sep 30, 20131 year rate0.127%Oct 31, 20131 year rate0.147%Nov 29, 20131 year rate0.127%Dec 31, 20131 year rate0.138%Jan 31, 20141 year rate0.141%Feb 28, 20141 year rate0.122%Mar 31, 20141 year rate0.119%Apr 30, 20141 year rate0.103%May 30, 20141 year rate0.095%Jun 30, 20141 year rate0.137%Jul 31, 20141 year rate0.148%Aug 29, 20141 year rate0.138%Sep 30, 20141 year rate0.172%Oct 31, 20141 year rate0.163%Nov 28, 20141 year rate0.162%Dec 31, 20141 year rate0.297%Jan 30, 20151 year rate0.213%Feb 27, 20151 year rate0.278%Mar 31, 20151 year rate0.286%Apr 30, 20151 year rate0.275%May 29, 20151 year rate0.291%Jun 30, 20151 year rate0.311%Jul 31, 20151 year rate0.354%Aug 31, 20151 year rate0.443%Sep 30, 20151 year rate0.345%Oct 30, 20151 year rate0.450%Nov 30, 20151 year rate0.652%Dec 31, 20151 year rate0.774%Jan 29, 20161 year rate0.621%Feb 29, 20161 year rate0.645%Mar 31, 20161 year rate0.573%Apr 29, 20161 year rate0.565%May 31, 20161 year rate0.705%Jun 30, 20161 year rate0.476%Jul 29, 20161 year rate0.546%Aug 31, 20161 year rate0.644%Sep 30, 20161 year rate0.632%Oct 31, 20161 year rate0.691%Nov 30, 20161 year rate0.838%Dec 30, 20161 year rate0.883%Jan 31, 20171 year rate0.864%Feb 28, 20171 year rate0.908%Mar 31, 20171 year rate1.036%Apr 28, 20171 year rate1.106%May 31, 20171 year rate1.177%Jun 30, 20171 year rate1.246%Jul 31, 20171 year rate1.228%Aug 31, 20171 year rate1.216%Sep 29, 20171 year rate1.316%Oct 31, 20171 year rate1.429%Nov 30, 20171 year rate1.626%Dec 29, 20171 year rate1.755%Jan 31, 20181 year rate1.915%Feb 28, 20181 year rate2.037%Mar 29, 20181 year rate2.104%Apr 30, 20181 year rate2.259%May 31, 20181 year rate2.247%Jun 29, 20181 year rate2.325%Jul 31, 20181 year rate2.441%Aug 31, 20181 year rate2.454%Sep 28, 20181 year rate2.622%Oct 31, 20181 year rate2.696%Nov 30, 20181 year rate2.705%Dec 31, 20181 year rate2.568%Jan 31, 20191 year rate2.511%Feb 28, 20191 year rate2.536%Mar 29, 20191 year rate2.378%Apr 30, 20191 year rate2.355%May 31, 20191 year rate2.173%Jun 28, 20191 year rate1.933%Jul 31, 20191 year rate2.039%Aug 30, 20191 year rate1.756%Sep 30, 20191 year rate1.808%Oct 31, 20191 year rate1.597%Nov 29, 20191 year rate1.684%Dec 31, 20191 year rate1.624%Jan 31, 20201 year rate1.477%Feb 28, 20201 year rate1.058%Mar 31, 20201 year rate0.265%Apr 30, 20201 year rate0.171%May 29, 20201 year rate0.185%Jun 30, 20201 year rate0.173%Jul 31, 20201 year rate0.132%Aug 31, 20201 year rate0.134%Sep 30, 20201 year rate0.128%Oct 30, 20201 year rate0.132%Nov 30, 20201 year rate0.117%Dec 31, 20201 year rate0.116%Jan 29, 20211 year rate0.087%Feb 26, 20211 year rate0.101%Mar 31, 20211 year rate0.078%Apr 30, 20211 year rate0.079%May 28, 20211 year rate0.073%Jun 30, 20211 year rate0.099%Jul 30, 20211 year rate0.082%Aug 31, 20211 year rate0.087%Sep 30, 20211 year rate0.099%Oct 29, 20211 year rate0.188%Nov 30, 20211 year rate0.251%Dec 31, 20211 year rate0.422%Jan 31, 20221 year rate0.783%Feb 28, 20221 year rate1.062%Mar 31, 20221 year rate1.707%Apr 29, 20221 year rate2.111%May 31, 20221 year rate2.037%Jun 30, 20221 year rate2.780%Jul 29, 20221 year rate2.935%Aug 31, 20221 year rate3.381%Sep 30, 20221 year rate4.176%Oct 31, 20221 year rate4.571%Nov 30, 20221 year rate4.650%Dec 30, 20221 year rate4.705%Jan 31, 20231 year rate4.661%Feb 28, 20231 year rate5.064%Mar 31, 20231 year rate4.536%Apr 28, 20231 year rate4.666%May 31, 20231 year rate5.026%Jun 30, 20231 year rate5.303%Jul 31, 20231 year rate5.280%Aug 31, 20231 year rate5.268%Sep 29, 20231 year rate5.364%Oct 31, 20231 year rate5.347%Nov 30, 20231 year rate5.084%Dec 29, 20231 year rate4.745%Jan 31, 20241 year rate4.715%Feb 29, 20241 year rate4.972%Mar 29, 20241 year rate4.977%Apr 30, 20241 year rate5.198%May 31, 20241 year rate5.114%Jun 28, 20241 year rate5.052%Jul 31, 20241 year rate4.717%Aug 30, 20241 year rate4.340%Sep 30, 20241 year rate3.967%Oct 31, 20241 year rate4.297%Nov 29, 20241 year rate4.332%Dec 31, 20241 year rate4.219%Jan 31, 20251 year rate4.227%Feb 28, 20251 year rate4.105%Mar 31, 20251 year rate4.028%Apr 30, 20251 year rate3.858%May 30, 20251 year rate4.105%Jun 30, 20251 year rate3.973%Jul 31, 20251 year rate4.123%Aug 29, 20251 year rate3.824%Sep 30, 20251 year rate3.723%Oct 31, 20251 year rate3.712%Nov 28, 20251 year rate3.630%Dec 31, 20251 year rate3.516%Jan 30, 20261 year rate3.550%Feb 27, 20261 year rate3.503%Mar 31, 20261 year rate3.760%Apr 30, 20261 year rate3.785%May 29, 20261 year rate3.868%Jun 30, 20261 year rate4.039%Jul 31, 20261 year rate4.122%Aug 31, 20261 year rate4.159%Sep 9, 20261 year rate4.194%

217 month ends. The high, low, mean and percentile above are computed over all 4,508 fitted days, not over these 217 points. Mean across the whole history is 1.561%.

The last 30 trading days

The 1 year US Treasury rate on each of the last 30 fitted trading days.
DateRate
Sep 9, 20264.194%
Sep 8, 20264.171%
Sep 4, 20264.170%
Sep 3, 20264.135%
Sep 2, 20264.179%
Sep 1, 20264.191%
Aug 31, 20264.159%
Aug 28, 20264.163%
Aug 27, 20264.056%
Aug 26, 20264.052%
Aug 25, 20264.037%
Aug 24, 20264.061%
Aug 21, 20264.052%
Aug 20, 20264.018%
Aug 19, 20264.016%
Aug 18, 20264.010%
Aug 17, 20264.017%
Aug 14, 20264.012%
Aug 13, 20264.011%
Aug 12, 20264.052%
Aug 11, 20264.074%
Aug 10, 20264.091%
Aug 7, 20264.057%
Aug 6, 20264.100%
Aug 5, 20264.061%
Aug 4, 20264.066%
Aug 3, 20264.104%
Jul 31, 20264.122%
Jul 30, 20264.090%
Jul 29, 20264.099%

Each date links to every family fitted on that day.

The other key rates

1 month3 month6 month2 year3 year5 year7 year10 year20 year30 year

Index levels before September 30, 2026 are back-tested. They were computed after the fact by applying the rules to historical data, which benefits from hindsight in the choice of rules, and an index cannot be invested in directly. Methodology v1.0 takes effect at that rebalance, when levels begin to be struck on the day; the rulebook is identical either way, and the version is published on every row.

A fitted curve is a fit, not a quote. Daily error averages 3.8 basis points across the history and reaches about 20 on the worst days, in December 2008, when the market was genuinely hard to fit one smooth curve to. Every curve page publishes its own fit error rather than burying it.

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Curves are fitted from public Treasury data and carry fit error; figures are not a record of trading, and an index cannot be invested in directly. No claim of compliance with the IOSCO Principles for Financial Benchmarks is made or implied. Not investment advice, not an offer, and not a recommendation to buy or sell any security.