December 2025

The zero curve on each of 22 trading days this month.

3.00%3.50%4.00%4.50%5.00%5.50%Dec 1, 2025Dec 31, 2025Dec 1, 20252Y zero rate3.538%10Y zero rate4.179%30Y zero rate4.896%Dec 2, 20252Y zero rate3.513%10Y zero rate4.178%30Y zero rate4.908%Dec 3, 20252Y zero rate3.483%10Y zero rate4.150%30Y zero rate4.906%Dec 4, 20252Y zero rate3.525%10Y zero rate4.200%30Y zero rate4.941%Dec 5, 20252Y zero rate3.560%10Y zero rate4.220%30Y zero rate4.928%Dec 8, 20252Y zero rate3.577%10Y zero rate4.260%30Y zero rate4.955%Dec 9, 20252Y zero rate3.605%10Y zero rate4.264%30Y zero rate4.934%Dec 10, 20252Y zero rate3.535%10Y zero rate4.245%30Y zero rate4.981%Dec 11, 20252Y zero rate3.524%10Y zero rate4.236%30Y zero rate4.953%Dec 12, 20252Y zero rate3.530%10Y zero rate4.295%30Y zero rate5.030%Dec 15, 20252Y zero rate3.507%10Y zero rate4.278%30Y zero rate5.029%Dec 16, 20252Y zero rate3.474%10Y zero rate4.244%30Y zero rate5.010%Dec 17, 20252Y zero rate3.484%10Y zero rate4.252%30Y zero rate5.013%Dec 18, 20252Y zero rate3.461%10Y zero rate4.211%30Y zero rate4.970%Dec 19, 20252Y zero rate3.480%10Y zero rate4.244%30Y zero rate5.000%Dec 22, 20252Y zero rate3.503%10Y zero rate4.254%30Y zero rate4.999%Dec 23, 20252Y zero rate3.534%10Y zero rate4.244%30Y zero rate4.951%Dec 24, 20252Y zero rate3.533%10Y zero rate4.224%30Y zero rate4.924%Dec 26, 20252Y zero rate3.491%10Y zero rate4.220%30Y zero rate4.976%Dec 29, 20252Y zero rate3.469%10Y zero rate4.203%30Y zero rate4.977%Dec 30, 20252Y zero rate3.458%10Y zero rate4.217%30Y zero rate5.000%Dec 31, 20252Y zero rate3.485%10Y zero rate4.266%30Y zero rate5.056%
2Y zero rate10Y zero rate30Y zero rate
Zero rate first, last, low and high for each charted tenor across December 2025.
TenorFirstLastChangeLowHigh
2Y3.538%3.485%-5.3 bp3.458%Dec 30, 20253.605%Dec 9, 2025
10Y4.179%4.266%+8.7 bp4.150%Dec 3, 20254.295%Dec 12, 2025
30Y4.896%5.056%+16.0 bp4.896%Dec 1, 20255.056%Dec 31, 2025

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 2, 10 and 30 years for every fitted trading day in December 2025.
Date2 year10 year30 year
Dec 1, 20253.538%4.179%4.896%
Dec 2, 20253.513%4.178%4.908%
Dec 3, 20253.483%4.150%4.906%
Dec 4, 20253.525%4.200%4.941%
Dec 5, 20253.560%4.220%4.928%
Dec 8, 20253.577%4.260%4.955%
Dec 9, 20253.605%4.264%4.934%
Dec 10, 20253.535%4.245%4.981%
Dec 11, 20253.524%4.236%4.953%
Dec 12, 20253.530%4.295%5.030%
Dec 15, 20253.507%4.278%5.029%
Dec 16, 20253.474%4.244%5.010%
Dec 17, 20253.484%4.252%5.013%
Dec 18, 20253.461%4.211%4.970%
Dec 19, 20253.480%4.244%5.000%
Dec 22, 20253.503%4.254%4.999%
Dec 23, 20253.534%4.244%4.951%
Dec 24, 20253.533%4.224%4.924%
Dec 26, 20253.491%4.220%4.976%
Dec 29, 20253.469%4.203%4.977%
Dec 30, 20253.458%4.217%5.000%
Dec 31, 20253.485%4.266%5.056%

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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Safe Rate™, Safe Rate Indices™ and the Safe Rate US Treasury Index™ are trademarks of Safe Rate, claimed through use in commerce and not registered. Third-party marks are the property of their owners, which are not affiliated with and do not endorse this data.

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.