iShares Russell 2000 ETF (IWM) Seasonality
Recurring seasonal patterns for IWM — the calendar windows where iShares Russell 2000 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.
IWM seasonality at a glance
Over the last 10 years, IWM's strongest seasonal window has been May 23 – Jun 12: it ended higher in 10 of 10 years (100% win rate) with an average return of +3.17% across a 20-day hold. On the weak side, IWM has historically declined between Mar 3 – Mar 23, falling in 8 of 10 years (average -5.48%).
In total, our analysis finds 529 recurring seasonal windows for iShares Russell 2000 ETF — 410 bullish and 119 bearish. The next high-win-rate window, Aug 18 – Aug 28, opens in 22 days. These figures describe historical behaviour only — not a forecast.
IWM'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 6d ago | Jun 21 – Jul 21 | 30d | +3.81% | 80% | +0.32% |
| Completedended 10d ago | Jun 17 – Jul 17 | 30d | +3.39% | 90% | +1.44% |
| Upcomingin 22d | Aug 18 – Aug 28 | 10d | +1.01% | 80% | — |
| Upcomingin 23d | Aug 19 – Aug 29 | 10d | +1.54% | 80% | — |
| Upcomingin 24d | Aug 20 – Aug 30 | 10d | +1.57% | 80% | — |
| Upcomingin 25d | Aug 21 – Aug 31 | 10d | +1.23% | 80% | — |
| Upcomingin 26d | Aug 22 – Sep 1 | 10d | +1.29% | 80% | — |
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 IWM seasonality in full
See the seasonal curve chart, filter by win rate and return, and track upcoming windows — free during beta.
IWM seasonality FAQ
What has historically been the best month to buy IWM stock?
Based on the last 10 years of price data, IWM's strongest seasonal window starts in May: May 23 to Jun 12, which ended higher in 10 of 10 years (100% win rate) with an average return of +3.17%. Past seasonal patterns do not guarantee future performance.
What is IWM's strongest seasonal pattern?
IWM's highest-win-rate pattern in our data is the May 23 – Jun 12 window (20-day hold): up in 10 of the last 10 years with an average move of +3.17%.
When has IWM historically performed worst?
IWM's weakest recurring window has been Mar 3 to Mar 23, declining in 8 of 10 years with an average return of -5.48%.
How reliable are IWM's seasonal patterns?
Each IWM pattern is scored by its historical win rate — the share of the last 10 years it repeated in the same direction. IWM currently shows 529 recurring windows (410 bullish, 119 bearish). Seasonality describes historical tendencies only; it is not a prediction, and past performance does not guarantee future results.
What is IWM 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 Russell 2000 ETF's price history across many years, SeasonalityX identifies recurring calendar windows — exact start and end dates — where IWM 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.