Columbia Banking System (COLB) Seasonality
Recurring seasonal patterns for COLB — the calendar windows where Columbia Banking System 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.
COLB seasonality at a glance
Over the last 10 years, COLB's strongest seasonal window has been Oct 16 – Nov 15: it ended higher in 10 of 10 years (100% win rate) with an average return of +12.23% across a 30-day hold. On the weak side, COLB has historically declined between Mar 6 – Apr 5, falling in 10 of 10 years (average -10.71%).
In total, our analysis finds 724 recurring seasonal windows for Columbia Banking System — 441 bullish and 283 bearish. The next high-win-rate window, Aug 6 – Aug 16, opens in 10 days. These figures describe historical behaviour only — not a forecast.
COLB'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 3d ago | Jun 24 – Jul 24 | 30d | +4.80% | 80% | +2.32% |
| Completedended 4d ago | Jun 23 – Jul 23 | 30d | +4.64% | 80% | +3.17% |
| Upcomingin 10d | Aug 6 – Aug 16 | 10d | +1.51% | 80% | — |
| Upcomingin 31d | Aug 27 – Sep 6 | 10d | -1.15% | 80% | — |
| Upcomingin 35d | Aug 31 – Sep 10 | 10d | -1.99% | 80% | — |
| Upcomingin 36d | Sep 1 – Sep 11 | 10d | -2.08% | 80% | — |
| Upcomingin 73d | Oct 8 – Nov 7 | 30d | +6.20% | 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 COLB seasonality in full
See the seasonal curve chart, filter by win rate and return, and track upcoming windows — free during beta.
COLB seasonality FAQ
What has historically been the best month to buy COLB stock?
Based on the last 10 years of price data, COLB's strongest seasonal window starts in October: Oct 16 to Nov 15, which ended higher in 10 of 10 years (100% win rate) with an average return of +12.23%. Past seasonal patterns do not guarantee future performance.
What is COLB's strongest seasonal pattern?
COLB's highest-win-rate pattern in our data is the Oct 16 – Nov 15 window (30-day hold): up in 10 of the last 10 years with an average move of +12.23%.
When has COLB historically performed worst?
COLB's weakest recurring window has been Mar 6 to Apr 5, declining in 10 of 10 years with an average return of -10.71%.
How reliable are COLB's seasonal patterns?
Each COLB pattern is scored by its historical win rate — the share of the last 10 years it repeated in the same direction. COLB currently shows 724 recurring windows (441 bullish, 283 bearish). Seasonality describes historical tendencies only; it is not a prediction, and past performance does not guarantee future results.
What is COLB stock seasonality?
Stock seasonality is the tendency of a stock to perform in a similar way during the same period each year. By analysing Columbia Banking System's price history across many years, SeasonalityX identifies recurring calendar windows — exact start and end dates — where COLB 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.