Use the U.S. Treasury’s Daily Treasury Par Yield Curve Rates page for the official daily nominal curve. It shows rates by maturity and offers data for download; use the companion Daily Treasury Par Real Yield Curve Rates table when you need inflation-adjusted TIPS yields. Keep the two series clearly labeled: they answer related but different questions.
Where to find daily Treasury yields
The Treasury’s Interest Rate Statistics page is the entry point for its rate data. For a daily view of nominal rates, open the Daily Treasury Par Yield Curve Rates table. The companion Daily Treasury Par Real Yield Curve Rates page provides real yields derived from TIPS quotations.
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The nominal table lists constant-maturity points ranging from short maturities through 30 years, including 1-, 2-, 3-, 5-, 7-, 10-, 20- and 30-year rates. The real-yield table lists 5-, 7-, 10-, 20- and 30-year maturities. The Treasury page includes a CSV download and an XML feed for importing data into a spreadsheet or another repeatable workflow.
How to save and compare the data
- Choose the series. Select the nominal par yield curve for nominal rates, or the par real yield curve for TIPS-based real rates.
- Record the observation date. Keep each maturity in its own field and retain the date associated with every row.
- Build a curve snapshot. Compare maturities from the same observation date; this shows how the published rate varies across terms.
- Build a time series. Append each new business-day observation rather than replacing the previous row. This preserves the history you need to chart one maturity over time.
- Label charts clearly. Identify the date, maturity, and whether each line represents nominal or real yields.
These are practical ways to organize the published fields, not a storage method prescribed by the Treasury.
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What a constant-maturity yield represents
A constant-maturity Treasury (CMT) rate is an interpolated point on a fitted par yield curve. It does not require a currently outstanding Treasury security to have exactly that amount of time remaining before maturity. Treasury describes the published figures as yields “interpolated by the Treasury from the daily par yield curve.”
For the nominal curve, the inputs are indicative bid-side quotations for recently auctioned Treasury securities in the over-the-counter market. The Federal Reserve Bank of New York obtains the quotes at or near 3:30 p.m. each business day. They are market quotations, not prices from completed transactions. The resulting CMT rate is therefore a standardized estimate for a maturity, not the yield on a particular bond you own or are considering buying.
Nominal yields and real yields are not interchangeable
The nominal par curve is based on nominal Treasury securities. The par real yield curve is based on TIPS quotations and reports interpolated real yields at constant maturities. Use the nominal series when tracking nominal rates, and the real series when the question is about inflation-adjusted yields. If you place both on one chart or in one spreadsheet, label them separately rather than treating them as one continuous curve.
Important breaks and method changes in historical data
Long-run charts need two kinds of annotation: missing maturity observations and a change in how the Treasury estimates the curve.
- 20-year CMT gap: Treasury discontinued the series at the end of 1986 and reinstated it on October 1, 1993. No 20-year rates are available for January 1, 1987 through September 30, 1993.
- 30-year CMT interruption: Treasury discontinued the series on February 18, 2002, then reintroduced it on February 9, 2006. Rates are absent for the intervening period.
- Estimation-method change: On December 6, 2021, Treasury began using a monotone convex spline method, replacing the quasi-cubic Hermite spline method. Treasury says rates calculated under the earlier method remain official.
When charting or calculating changes across these periods, preserve the gaps and mark the method transition. A missing point is not a zero, and a methodology change means the series should not be presented as though its estimation method was unchanged throughout.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the curve can and cannot tell you
The Treasury tables support comparisons across maturities on one date, changes in a given maturity over time, and side-by-side views of nominal and real rates. They provide the rate observations; they do not, by themselves, establish what a particular maturity spread means or whether an inverted curve predicts a recession. Treat those as separate interpretation questions that require evidence beyond the data table.
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