When Do 0DTE Options Trade? By the Hour

The folk story about 0DTE options is an end-of-day casino: lottery tickets bought in the final hour for one last coin flip. The tape says otherwise. Measured hour by hour, same-day options trade heaviest in the morning, and their share of total options volume falls as the close approaches. This page measures the real intraday rhythm on a heavy 0DTE session — the weekly-expiry Friday of July 10, 2026 — and explains the mechanics the folk story misses.

The hourly profile, measured

SELECT
    toHour(toTimeZone(sip_timestamp, 'America/New_York')) AS et_hour,
    round(sumIf(size, substring(ticker, length(ticker) - 14, 6) = '260710') / 1e6, 2) AS same_day_contracts_m,
    round(sum(size) / 1e6, 2) AS all_contracts_m,
    round(100.0 * sumIf(size, substring(ticker, length(ticker) - 14, 6) = '260710') / sum(size), 1) AS same_day_pct
FROM global_markets.options_trades
WHERE sip_timestamp >= toDateTime64('2026-07-10 13:30:00', 9) AND sip_timestamp < toDateTime64('2026-07-10 20:00:00', 9)
GROUP BY et_hour
ORDER BY et_hour

Read the shape: the same-day share opens above half of ALL options volume — 52.9% in the 9 o'clock hour — peaks in absolute terms in the 10 o'clock hour at 7.19 million contracts, and then declines all day, finishing at 38.4% in the final full hour. The end-of-day lottery narrative has it backwards: by the afternoon, the 0DTE trade is shrinking both in share and in size relative to its own morning.

Why the morning, mechanically

The mechanics are unglamorous. A same-day option's entire life is one session, so whoever wants that exposure — day-range traders, hedgers of the day's events, premium sellers harvesting the final day of decay — has maximal product to work with at the open: the most hours, the most remaining premium, the widest daily range still unresolved. Every hour that passes burns the product itself: less time value to sell, less range left to bet on, and strikes that began at-the-money drifting irretrievably in or out. The afternoon's falling share is the product expiring in real time. What survives into the last hour is the residue — deep in-the-money contracts converging to stock, and pennies-wide out-of-the-money strikes where a mover could still flip them (the 0DTE guide shows one of those final-hour lottery strikes paying 495-to-1 — they exist, they are just not where the volume is).

The calendar sets the ceiling

The hourly curve rides on top of a daily one: how much 0DTE trading a session can have depends on what expires that day. On the Friday measured above, the same-day share of the whole session ran near half of all volume — a weekly-expiry day, with everything from the week's expiration calendar compressing into it. Midweek sessions on daily-expiry ETFs run lower shares; the Thursday before this Friday printed a same-day share in the twenties, receipted in that day's recap. Same product, same hours, different calendar — the two rhythms multiply.

What this changes about the folk story

The revised picture: 0DTE is a morning instrument whose day decays out from under it, not a closing-bell casino. For anyone deciding when such contracts are liquid — spreads tightest, size deepest — the answer is the first half of the session, while the product is still worth quoting; the DTE vocabulary page holds the broader spectrum this sits at the end of. And the final-hour drama the folk story remembers does happen — it is simply a small, residual slice of a much larger morning trade, memorable precisely for the vividness of its lottery cases, where the routine morning flow leaves no stories behind.

0DTE timing FAQ

What time of day do 0DTE options trade most?

The morning: on the session measured above, absolute same-day volume peaked in the 10 am ET hour and the same-day share of all options volume was highest at the open, declining into the close.

Are 0DTE options more active at the close?

No — both the share and the absolute volume of same-day contracts fell through the afternoon in the measured session. The final hour trades the residue: deep in-the-money contracts and cheap far strikes.

Does every day have 0DTE volume?

Every trading day has some — SPY and the major index ETFs list daily expirations — but the level rides the expiration calendar: weekly-expiry Fridays run the heaviest same-day shares, receipted above and in the expiration calendar.

Every figure is a stored, versioned query over the full options tape — expand the SQL, or slice any session's hours on the Strasmore terminal.