iShares Core US Aggregate Bond ETF (AGG) Seasonality
Recurring seasonal patterns for AGG — the calendar windows where iShares Core US Aggregate Bond ETF has historically tended to rise or fall, with the win rate (how often it repeated) and average return for each, based on the last 10 years of price history.
AGG seasonality at a glance
Over the last 10 years, AGG's strongest seasonal window has been Nov 13 – Dec 13: it ended higher in 9 of 10 years (90% win rate) with an average return of +1.15% across a 30-day hold. On the weak side, AGG has historically declined between Sep 22 – Oct 22, falling in 8 of 10 years (average -1.11%).
In total, our analysis finds 17 recurring seasonal windows for iShares Core US Aggregate Bond ETF — 9 bullish and 8 bearish. The next high-win-rate window, Sep 7 – Oct 7, opens in 42 days. These figures describe historical behaviour only — not a forecast.
AGG's upcoming & recent seasonal patterns
Holding period:10-day20-day30-dayOrdered by season — windows opening soon first, plus a couple of recently completed high-performers. Holding-period colors help you compare durations at a glance.
| Status | Seasonal window | Hold | Avg return | Win rate | This year |
|---|---|---|---|---|---|
| Completedended 111d ago | Mar 18 – Apr 7 | 20d | +1.12% | 80% | +0.13% |
| Completedended 115d ago | Mar 14 – Apr 3 | 20d | +1.03% | 90% | +0.36% |
| Upcomingin 42d | Sep 7 – Oct 7 | 30d | -1.18% | 80% | — |
| Upcomingin 43d | Sep 8 – Oct 8 | 30d | -1.16% | 80% | — |
| Upcomingin 46d | Sep 11 – Oct 11 | 30d | -1.01% | 80% | — |
| Upcomingin 56d | Sep 21 – Oct 21 | 30d | -1.16% | 80% | — |
| Upcomingin 57d | Sep 22 – Oct 22 | 30d | -1.11% | 90% | — |
Win rate = how often the pattern repeated in the same direction. Average return = the mean move across all analysed years. Past performance does not guarantee future results.
Explore AGG seasonality in full
See the seasonal curve chart, filter by win rate and return, and track upcoming windows — free during beta.
AGG seasonality FAQ
What has historically been the best month to buy AGG stock?
Based on the last 10 years of price data, AGG's strongest seasonal window starts in November: Nov 13 to Dec 13, which ended higher in 9 of 10 years (90% win rate) with an average return of +1.15%. Past seasonal patterns do not guarantee future performance.
What is AGG's strongest seasonal pattern?
AGG's highest-win-rate pattern in our data is the Nov 13 – Dec 13 window (30-day hold): up in 9 of the last 10 years with an average move of +1.15%.
When has AGG historically performed worst?
AGG's weakest recurring window has been Sep 22 to Oct 22, declining in 8 of 10 years with an average return of -1.11%.
How reliable are AGG's seasonal patterns?
Each AGG pattern is scored by its historical win rate — the share of the last 10 years it repeated in the same direction. AGG currently shows 17 recurring windows (9 bullish, 8 bearish). Seasonality describes historical tendencies only; it is not a prediction, and past performance does not guarantee future results.
What is AGG stock seasonality?
Stock seasonality is the tendency of a stock to perform in a similar way during the same period each year. By analysing iShares Core US Aggregate Bond ETF's price history across many years, SeasonalityX identifies recurring calendar windows — exact start and end dates — where AGG has repeatedly risen (bullish) or fallen (bearish). Each pattern is scored by its win rate and average return so you can judge how reliable and how strong it has been.
Seasonality is one input among many — it works best alongside your own research and risk management. Learn more in our guide to seasonal analysis and the tutorials.