Weekly options are contracts that expire at the end of a given week rather than monthly — offering more frequent expirations, faster decay, and precise short-term trading. They’re the foundation of the 0DTE era.

What they are

Traditionally, options expired monthly (third Friday). Weeklies added expirations every week, letting traders target short-term views precisely and cheaply. For SPY, expirations expanded from monthly to weekly to eventually every weekday — so today there’s a same-day (0DTE) option available daily. A 0DTE is just a weekly on its expiration day.

Why they matter

Weeklies are cheaper (less time value), decay faster, and enable short-term precision — ideal for active trading but unforgiving on timing. Their proliferation is why 0DTE trading exploded: there’s always a near-term expiration to trade. See weekly vs monthly for the comparison and SPY’s weekly schedule.

Weeklies made short-term options mainstream; daily expiries made them instantaneous. 0DTE is a weekly living its last day.

The takeaway

Weekly options expire weekly (now daily for SPY), enabling cheap, precise, fast-decaying short-term trades. They’re the basis of 0DTE scalping — NoVo’s arena. Understand them as the bridge from monthly options to the daily-expiry world.