US Treasury rates, May 2021

Zero rates at all 10 fitted maturities on each of 20 trading days this month. Zero rates, not par yields: these discount a single cashflow, and the par yield for the same day is on that day's own page.

0.00%0.50%1.00%1.50%2.00%2.50%3.00%May 3, 2021May 28, 2021May 3, 20212Y zero rate0.165%10Y zero rate1.702%30Y zero rate2.428%May 4, 20212Y zero rate0.160%10Y zero rate1.681%30Y zero rate2.400%May 5, 20212Y zero rate0.151%10Y zero rate1.658%30Y zero rate2.382%May 6, 20212Y zero rate0.159%10Y zero rate1.655%30Y zero rate2.377%May 7, 20212Y zero rate0.145%10Y zero rate1.665%30Y zero rate2.424%May 10, 20212Y zero rate0.153%10Y zero rate1.694%30Y zero rate2.469%May 11, 20212Y zero rate0.160%10Y zero rate1.712%30Y zero rate2.503%May 12, 20212Y zero rate0.172%10Y zero rate1.779%30Y zero rate2.557%May 13, 20212Y zero rate0.163%10Y zero rate1.758%30Y zero rate2.557%May 14, 20212Y zero rate0.162%10Y zero rate1.732%30Y zero rate2.518%May 17, 20212Y zero rate0.163%10Y zero rate1.742%30Y zero rate2.523%May 18, 20212Y zero rate0.161%10Y zero rate1.737%30Y zero rate2.536%May 19, 20212Y zero rate0.172%10Y zero rate1.775%30Y zero rate2.546%May 20, 20212Y zero rate0.159%10Y zero rate1.725%30Y zero rate2.506%May 21, 20212Y zero rate0.165%10Y zero rate1.725%30Y zero rate2.490%May 24, 20212Y zero rate0.160%10Y zero rate1.703%30Y zero rate2.467%May 25, 20212Y zero rate0.150%10Y zero rate1.656%30Y zero rate2.414%May 26, 20212Y zero rate0.148%10Y zero rate1.670%30Y zero rate2.424%May 27, 20212Y zero rate0.149%10Y zero rate1.697%30Y zero rate2.451%May 28, 20212Y zero rate0.144%10Y zero rate1.669%30Y zero rate2.424%
2Y zero rate10Y zero rate30Y zero rate
Zero rate first, last, low and high for each charted tenor across May 2021.
TenorFirstLastChangeLowHigh
2Y0.165%0.144%-2.1 bp0.144%May 28, 20210.172%May 12, 2021
10Y1.702%1.669%-3.2 bp1.655%May 6, 20211.779%May 12, 2021
30Y2.428%2.424%-0.3 bp2.377%May 6, 20212.557%May 13, 2021

Rates are percent; the change column is basis points. A rise in yield is a fall in price, so the colours here describe the rate rather than a bondholder's return.

Every trading day

Zero rate at each of the 10 fitted maturities, for every fitted trading day in May 2021.
Date1Y2Y3Y5Y7Y10Y15Y20Y25Y30Y
May 3, 20210.073%0.165%0.359%0.856%1.282%1.702%2.062%2.245%2.354%2.428%
May 4, 20210.075%0.160%0.354%0.846%1.266%1.681%2.038%2.219%2.328%2.400%
May 5, 20210.078%0.151%0.339%0.825%1.242%1.658%2.017%2.200%2.309%2.382%
May 6, 20210.079%0.159%0.344%0.825%1.241%1.655%2.013%2.195%2.304%2.377%
May 7, 20210.076%0.145%0.323%0.805%1.233%1.665%2.041%2.232%2.347%2.424%
May 10, 20210.080%0.153%0.335%0.822%1.255%1.694%2.077%2.273%2.391%2.469%
May 11, 20210.085%0.160%0.342%0.834%1.269%1.712%2.102%2.302%2.423%2.503%
May 12, 20210.084%0.172%0.374%0.889%1.335%1.779%2.164%2.361%2.478%2.557%
May 13, 20210.083%0.163%0.358%0.863%1.307%1.758%2.153%2.355%2.476%2.557%
May 14, 20210.079%0.162%0.351%0.848%1.287%1.732%2.121%2.319%2.438%2.518%
May 17, 20210.073%0.163%0.355%0.857%1.298%1.742%2.129%2.326%2.444%2.523%
May 18, 20210.081%0.161%0.346%0.848%1.290%1.737%2.132%2.334%2.455%2.536%
May 19, 20210.070%0.172%0.373%0.888%1.333%1.775%2.158%2.352%2.469%2.546%
May 20, 20210.074%0.159%0.347%0.844%1.282%1.725%2.112%2.309%2.427%2.506%
May 21, 20210.075%0.165%0.358%0.855%1.289%1.725%2.104%2.297%2.413%2.490%
May 24, 20210.067%0.160%0.350%0.840%1.270%1.703%2.081%2.274%2.390%2.467%
May 25, 20210.072%0.150%0.329%0.805%1.227%1.656%2.031%2.222%2.337%2.414%
May 26, 20210.067%0.148%0.330%0.814%1.240%1.670%2.043%2.234%2.348%2.424%
May 27, 20210.074%0.149%0.334%0.830%1.264%1.697%2.071%2.261%2.375%2.451%
May 28, 20210.073%0.144%0.322%0.808%1.238%1.669%2.044%2.234%2.348%2.424%

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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