The Fed blackout period is the roughly 10-day stretch before an FOMC meeting when Fed officials refrain from public comments on policy. With no Fedspeak to react to, one important source of intraday volatility is switched off — and that absence shapes SPY's behavior into the decision day.
What the silence does
During normal periods, a stray hawkish or dovish comment from a Fed official can jolt SPY intraday. In the blackout, that channel is closed, so — absent other catalysts — the market often drifts more calmly, with the dealer map holding a bit better and fewer surprise repricings. It's not that volatility disappears (data and events still hit), but one recurring source of noise is removed, which can make the tape read cleaner.
The coil into the decision
As the blackout runs into the meeting, positioning increasingly concentrates on the upcoming decision. Uncertainty builds with no official guidance to release it, so the market tends to coil — range-bound drift with a widening expected move — setting up the pre-2pm compression on decision day. The blackout is, in effect, the quiet before the FOMC storm.
The blackout removes the Fed's ability to leak, so the market has nothing to react to but its own anticipation — and anticipation coils rather than trends.
Trading it
Don't over-read the calm: a well-behaved blackout tape can lull you into complacency right before a violent decision-day reprice. Use the calmer stretch for cleaner level-based trades if the structure supports it, but keep the meeting date front of mind and expect the coil to tighten as it approaches. NoVo maps the live structure regardless of the macro backdrop; knowing you're in a blackout just tells you which regime you're trading and what's coming to end it.