Par yield curve, constant maturity: 1.5-month
What has the 1.5-month Treasury yield been over time?
On , Treasury's 1.5-month par yield was 4.11%, 2 basis points lower than the day before and 8 basis points higher than a year earlier.
The 1.5-month par yield on the last business day of each month
The 1.5-month par yield each business day
Each point is one month-end, or one business day under "Latest days"; pointing at the chart shows its date and yield.
Select a line to followLatest:
Inspect and compare dates
The latest day beside the day before and the month-ends nearest a year, five and ten years earlier.
| Day | Latest | The day before | A year earlier |
|---|---|---|---|
| Date | |||
| Par yield | 4.11% | 4.13% | 4.19% |
Observed .
Right now
The 1.5-month par yield was 4.11% on , 8 basis points higher than a year earlier.
The 1.5-month par yield ended September 2026 at 4.13%, its highest month-end since September 2025.
ChangeOurs
| Period | Then | Change |
|---|---|---|
| One month | 3.86%, the yield at the end of | +0.27 percentage points |
| Three months | 3.74%, the yield at the end of | +0.39 percentage points |
| Twelve months | 4.19%, the yield at the end of | −0.06 percentage points |
| Five years | The series begins in | |
| Ten years | The series begins in |
In historyOurs
The 1.5-month par yield of 4.13% at the end of was higher than in 11 of the 19 other month-ends since , the same in 0 and lower in 8.
Highest since : 4.47% at the end of . Lowest since : 3.71% at the end of .
AverageOurs
Average since : 4.037% (ours, a plain mean of the 20 month-ends).
Its 52-week rangeOurs, from Treasury's curve
The 1.5-month par yield, change from one month-end to the next, by year
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Whole year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | −2 | 0 | 0 | −2 | 0 | +3 | +6 | +6 | +27 | – | – | – | +38 |
| 2025 | – | – | −1 | +1 | −2 | +6 | +6 | −13 | −15 | −17 | −5 | −22 | – |
| Average | −2.0 | 0.0 | −0.5 | −0.5 | −1.0 | +4.5 | +6.0 | −3.5 | +6.0 | −17.0 | −5.0 | −22.0 | – |
Each chip is one month. The mark in its middle is zero: a fill to the right of it is a rise and a fill to the left a fall. A longer, brighter fill is a larger change, in five steps up to 22 and over; the last column has a scale of its own, up to 38 and over. Every chip prints its figure and sign. A year still running is counted through its last month: .
Observed .
Understanding the 1.5-month par yield
Where it stands today
The 1.5-month par yield was 4.11% on .
What does this chart measure?
The 1.5-month par yield is the coupon rate at which a new 1.5-month Treasury security would sell at par, from the curve Treasury fits each business day to closing bid prices.
Read more
Month-ends are the last business day of each finished month Treasury published a value for this term; the running month shows in the latest days. The 52-week range and the changes in basis points are computed by 500metrics.
The numbers behind the chart
What was the yield at each month-end?20 month-ends since 28 Feb 2025, newest first
| Month-end | Par yield |
|---|---|
| 4.13% | |
| 3.86% | |
| 3.80% | |
| 3.74% | |
| 3.71% | |
| 3.71% | |
| 3.73% | |
| 3.73% | |
| 3.73% | |
| 3.75% | |
| 3.97% | |
| 4.02% | |
| 4.19% | |
| 4.34% | |
| 4.47% | |
| 4.41% | |
| 4.35% | |
| 4.37% | |
| 4.36% | |
| 4.37% |
What was the yield on each of the last 30 business days?Each business day, newest first
| Date | Par yield |
|---|---|
| 4.11% | |
| 4.13% | |
| 4.11% | |
| 4.10% | |
| 4.12% | |
| 4.13% | |
| 4.14% | |
| 4.14% | |
| 4.15% | |
| 4.15% |
Show 20 more rows
| Date | Par yield |
|---|---|
| 4.15% | |
| 4.13% | |
| 4.14% | |
| 4.13% | |
| 4.12% | |
| 4.10% | |
| 4.09% | |
| 4.10% | |
| 4.13% | |
| 4.14% | |
| 4.14% | |
| 4.14% | |
| 4.10% | |
| 4.07% | |
| 4.04% | |
| 4.02% | |
| 3.98% | |
| 3.98% | |
| 4.00% | |
| 4.00% |
What do these figures leave out, and how are they cited?Limits, dates and how to cite
What this number cannot tell you
- A fitted curve value, not the yield of one security: an outstanding note or bond of about this term trades at its own yield.
- Month-end values hide moves inside the month; the latest days are shown day by day.
Observed .
How to cite this
U.S. Treasury, Daily Treasury Par Yield Curve Rates, 1.5-month term, through 27 October 2026. Compiled by 500metrics, "What has the 1.5-month Treasury yield been over time?", https://500metrics.com/treasury/yield-curve/1-5-month.
Can the data be downloaded?treasury-yield-curve-1-5-month.csv
Download the full history as CSV: 20 rows, to , 330 bytes.
Our text and compilation: CC BY 4.0.
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