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Are There Repeatable Seasonal Patterns in SPX 0DTE?
Do certain months, weeks, and days quietly tilt the odds for same-day SPX options — or are we just seeing ghosts in noisy data?
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Have you ever noticed how some days “just feel” easier to trade than others? Maybe Mondays seem jumpy, summers feel sleepy, and the Friday before a long weekend mysteriously grinds up… or down. Here’s the big question: are there repeatable seasonal patterns in SPX 0DTE options you can lean on — or are we curve-fitting the past to comfort ourselves?
I spent months pulling together intraday SPX data and same-day options outcomes to hunt for seasonality you could actually use. The short answer: yes, there are tendencies. The longer answer: they’re subtle, they morph around macro calendars, and they demand a rules-first approach to avoid fooling yourself.
Let’s walk through the eight most useful seasonal tendencies I found, the “July flip” that surprised me, and a simple way to test this yourself without drowning in spreadsheets.
