Forex trading is officially active 24 hours a day, five days a week. Excluding Saturday and Sunday, it is always possible to trade currencies. That is true, but it is not always advisable. At certain hours the market offers conditions that work against you: volatility so high that the analysis you did an hour ago no longer describes the same market, or liquidity so thin that the broker widens the spread to cover its own risk.
The good news is that these moments are predictable. Some are fixed hours of the day; others coincide with scheduled events. Knowing both is most of the work.
The four sessions and where they overlap
The trading day is usually described through four sessions: Sydney, Tokyo, London and New York. What matters is not each session on its own but where two of them are open at the same time, because that is when the number of participants, and therefore liquidity, is highest.
The London–New York overlap is the busiest window of the day, roughly 13:00 to 16:00 UTC. Spreads are at their tightest, orders fill close to where you expect, and the major pairs move with enough range to make a plan worth placing. The Tokyo–London overlap in the early morning is a smaller version of the same thing, useful on pairs involving the yen and the pound.
The hours to avoid
The thinnest part of the day is the stretch after the New York session closes and before Tokyo gets going. Only Sydney is holding up the market: spreads widen, and a move that would be absorbed at midday can push price several pips in a direction nobody intended. It is not that trading is impossible there — it is that the cost of being wrong goes up while the reward stays the same.
There is one specific hour worth naming, because it catches people out. The forex day ends at the New York close, 17:00 New York time — 21:00 UTC in summer, 22:00 in winter. Around that moment brokers roll positions to the next value date, and for a few minutes the spread on some pairs widens enormously. Orders left sitting there can be filled at prices the market never really traded, and stop-losses can be triggered by a spread spike rather than by a genuine move. If you hold pending orders overnight, this is the window to keep them out of.
The week has two edges of its own. The market reopens on Sunday evening with a gap against Friday's close whenever something happened over the weekend, and closes on Friday at the New York close. The first and last hour of the week are both thinner than they look.
Events, not just hours
The second family of dangerous moments has nothing to do with the clock and everything to do with the calendar. These are the releases and announcements commonly called market movers — not to be confused with market makers, which are the brokers on the other side of the trade.
The ones that reliably move currencies are statements by central bank governors and the rate decisions that follow them, employment and inflation data, and political events whose outcome is genuinely uncertain. What creates the move is not the number itself but the distance between the number and what the market expected: a result exactly in line with consensus can pass almost unnoticed, while a small surprise on an important series can move a pair further in five minutes than in the previous five hours.
This is why the practical advice is not “avoid the news” but “know when it lands”. Check the week's schedule before you plan, and decide in advance whether you want to be in the market when a high-impact release prints. The site’s economic calendar lists this week’s releases with consensus and previous readings, and adds the actual figures once they are published, with times in your own zone.
What this means in practice
Three habits cover most of it. Concentrate your activity in the overlaps, where liquidity pays for your spread. Keep pending orders away from the rollover around the New York close. And before placing a trade, look at what is scheduled for the hours it is meant to live through — a good setup and a central bank decision in the same afternoon are two different trades, and only one of them is the one you analyzed.
