These figures are computed from 15 years of actual monthly closing prices. Past seasonal patterns are not a guarantee of future performance. See our methodology for how this is calculated, or visit the Academy to learn how to read seasonal data responsibly.
iShares 20yr Treasury seasonality — common questions
What is iShares 20yr Treasury's best month historically?
Historically, November has been iShares 20yr Treasury's strongest month, averaging +1.35% with a 73% win rate over 15 years of data. October has been the weakest at -1.69%.
Is iShares 20yr Treasury seasonal?
iShares 20yr Treasury shows a measurable seasonal pattern: its best and worst months differ by 3.04 percentage points on average. These figures come from 15 years of real monthly closing prices. Seasonality is a historical tendency, not a prediction.
How does iShares 20yr Treasury historically perform in August?
iShares 20yr Treasury is currently in August, which has historically averaged +0.95% with a 50% win rate. That is a historically neutral window.
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