A quoted spread of 0.6 pips on EUR/USD looks tidy on a broker's website. Then you open your platform at a quiet hour or during a data release and see 3 pips, or more. Spreads are not a fixed fee; they are a live price for liquidity, and they change constantly. This article explains the predictable moments when they widen, what is happening underneath, and how to build the habit into your plan. Examples are illustrative.
What the spread is
The spread is the gap between the bid (the price at which you can sell) and the ask (the price at which you can buy). It is the main transaction cost for most retail traders, and you pay it the moment you enter. If you want the basics, see how to read a forex quote and spreads and slippage. Behind the quote, liquidity providers such as banks and non-bank market makers stream prices to your broker, who may add a markup. When providers feel more risk or when fewer of them are quoting, the gap widens.
The usual suspects
1. Daily rollover
Around 5 pm New York time, the trading day rolls over and the value date for new positions advances. Liquidity thins sharply for a short window, often a few minutes either side, and spreads on many pairs balloon, sometimes to several times normal. It is also when swap or financing charges are applied, as covered in swap rates and rollover. Stop-losses sitting inside this window can be triggered by a spread spike rather than a genuine price move, because a stop on a long position is triggered by the bid, while the chart you look at may be drawn from the bid alone and never show the ask widening.
2. High-impact news
In the seconds around a central bank decision, an employment report or an inflation print, liquidity providers pull or widen quotes to avoid being picked off. Spreads can jump, prices can gap and fills can slip. This is not a broker conspiracy; it is risk management by the people on the other side. See trading around high-impact news events.
3. Session transitions and quiet hours
Spreads tend to be tightest when London and New York overlap and widest in the thin hours between the New York close and the Asian open. Pairs that are not native to the active session suffer most; a European cross in the late Pacific session may trade with a spread several times its London level. See forex trading sessions, and note that daylight saving changes shift these windows by an hour for a few weeks of the year (daylight saving and sessions).
4. Weekend opens and gaps
Sunday evening trading opens with few participants, and spreads are often wide until activity builds. If a weekend event shifted prices, the opening quotes may also gap. More in weekend gaps.
5. Holidays and market stress
On bank holidays in a major financial centre, volumes drop and spreads widen. During sharp, one-directional moves or sudden shocks, liquidity can evaporate even in the busiest session.
6. Exotic and thin pairs
Currencies outside the major group have fewer liquidity providers and typically wider spreads at all times, widening further under stress. See major, minor and exotic pairs.
Fixed versus variable spreads
Some brokers advertise fixed spreads. These may come with wider baseline costs, requotes or rejected orders in fast markets, so check the terms. Variable (floating) spreads are usually tighter in normal conditions but wider in stress. Neither is automatically better. Understanding how your broker handles the chaotic moments is part of broker due diligence, and how the broker earns money is explained in market maker vs ECN.
How spread widening hurts different strategies
- Scalpers are hit hardest. If your target is 5 pips and the spread is 3, the trade is nearly dead on arrival.
- Swing traders care less about a momentary spike but should avoid placing tight stops that sit inside rollover.
- Stop-loss users are exposed to spread-induced stop-outs when the ask widens.
- Anyone using pending orders around news may be filled at worse prices than the level placed.
Practical habits
- Measure your own spreads. Record the spread at entry in your journal for a few weeks, with time of day. Your own broker's pattern is more useful than any general rule.
- Avoid entries during rollover. Wait until the spread normalises. A ten-minute delay seldom changes a swing trade's logic.
- Set stops with room. Place them beyond obvious noise and, where you can, away from the rollover and news windows. Our piece on stop placement covers the reasoning.
- Use the economic calendar. Know when scheduled events land, and decide beforehand whether to stand aside.
- Include costs in backtests. A test that assumes a constant tight spread overstates results. See backtesting honestly.
- Compare spread to range. If the spread is more than a small fraction of a typical stop distance or target, the trade does not pay its own way.
Illustrative cost example
Suppose a trade risks 20 pips with a 40-pip target. At a 0.8-pip spread, costs consume 4% of the risk and 2% of the reward. At a 4-pip spread during rollover, costs consume 20% of the risk and 10% of the reward, which turns a decent reward-to-risk ratio into a visibly weaker one. Same idea, same chart, very different economics.
Bottom line
Spreads widen at predictable times: rollover, major news, thin sessions, weekend opens, holidays and market stress. You cannot remove the cost, but you can avoid paying peak prices, avoid stops that sit in a spike, and measure the real cost of your own broker. Make liquidity part of your pre-trade check, alongside direction and risk.
This article is educational and is not investment advice. Pip values and spreads are illustrative.