Under normal conditions, EUR/USD might trade with a spread of 0.6–1.0 pips. Then a central bank announces an unexpected rate decision, and within seconds that spread balloons to 8, 15, or even 30 pips. Your carefully planned trade, which assumed a 1-pip cost, suddenly faces a cost ten times higher.
Spread widening is one of the most impactful market phenomena that traders underestimate. It does not happen randomly. It follows predictable patterns tied to liquidity, volatility, and market structure. Understanding when and why spreads widen is essential to protecting your capital and timing your entries.
What Causes Spreads to Widen
Low Liquidity Periods
The forex market operates 24 hours a day, five days a week, but liquidity is not evenly distributed across those hours. During the London-New York overlap (approximately 13:00–17:00 UTC), major pairs enjoy the deepest liquidity pools and tightest spreads. But during quieter periods, the late New York session, early Asian session, or the transition between Asian and European sessions, fewer market makers are actively quoting, and spreads naturally widen.
Typical spread variation for EUR/USD across sessions:
| Session | Approximate Spread | Liquidity Level |
|---|---|---|
| London-New York overlap | 0.5–1.0 pips | Highest |
| London session | 0.8–1.2 pips | High |
| New York session | 0.8–1.5 pips | High |
| Asian session | 1.0–2.0 pips | Moderate |
| Weekend gap / rollover | 2.0–5.0+ pips | Low |
High-Impact News Events
Scheduled economic releases are the most predictable cause of extreme spread widening. In the seconds before and after major announcements, liquidity providers pull their quotes from the market to avoid being filled at stale prices during a rapid move. This temporary withdrawal of liquidity causes spreads to spike dramatically.
The most impactful events for spread widening include:
- Non-Farm Payrolls (NFP), Released on the first Friday of every month. EUR/USD spreads can widen to 5–20 pips in the seconds surrounding the release.
- Federal Reserve (FOMC) rate decisions, Spreads on all USD pairs expand significantly. Surprise decisions can cause spreads of 10–30 pips.
- European Central Bank (ECB) rate decisions, Similar impact on EUR pairs.
- Bank of England (BOE) decisions, GBP pairs see the most dramatic widening.
- Flash crashes and geopolitical shocks, The January 2019 JPY flash crash saw USD/JPY spreads blow out to over 100 pips on some retail platforms, and the 2015 Swiss National Bank removal of the EUR/CHF floor produced spreads measured in hundreds of pips.
Market Open Gaps
When the forex market reopens on Sunday evening (approximately 22:00 UTC), spreads are typically wide for the first 15–60 minutes. Over the weekend, news events may have shifted sentiment, but there is no continuous price discovery. The first quotes of the week reflect uncertainty about where fair value sits, resulting in wider spreads until enough participants enter the market to establish consensus pricing.
If you hold positions over the weekend, be aware that your stop losses can be triggered at significantly worse prices than the level you set, due to the combination of the opening gap and wide spreads.
Exotic and Minor Pairs
Spread widening is not limited to events, it is a structural feature of less-liquid instruments. While EUR/USD might trade with a 0.6-pip spread during peak hours, a pair like USD/TRY (US Dollar/Turkish Lira) might have a typical spread of 15–80 pips, and an exotic cross like NOK/SEK might see 30–100+ pip spreads. These pairs have fewer market makers, lower volume, and are inherently more expensive to trade.
Fixed Spreads vs Variable Spreads
Brokers offer two fundamental spread models, and each handles widening differently.
Variable (Floating) Spreads
Variable spread brokers pass through market conditions directly. Spreads are tight when liquidity is deep and widen when it is thin. This model reflects the true state of the market and typically offers the lowest average costs during normal conditions.
Advantages:
- Tightest possible spreads during peak hours
- Transparent, you see real market conditions
- Lower average cost for high-frequency traders
Disadvantages:
- Spreads can spike unpredictably during events
- Stop losses and pending orders may be triggered by temporarily wide spreads
- Requires awareness of timing and conditions
Fixed Spreads
Fixed spread brokers guarantee a consistent spread regardless of market conditions (with some exceptions during extreme events, which should be disclosed in the terms of service). The broker absorbs the difference when market spreads are wider than the fixed quote.
Advantages:
- Predictable costs for every trade
- No spread surprises during moderate news events
- Easier to calculate exact trading costs in advance
Disadvantages:
- Fixed spreads are wider than the best variable spreads during calm markets
- Higher average cost overall
- During truly extreme events, even "fixed" spreads may widen (check your broker's terms)
Protecting Yourself During Spread Widening
Know the Calendar
The most predictable spread spikes happen around scheduled events. Check the economic calendar daily and know when high-impact releases are due. If you do not have a specific news-trading strategy, staying flat during the 5 minutes before and 5–15 minutes after major releases is the simplest protection.
Use Limit Orders, Not Market Orders
If you must enter during a volatile period, a limit order ensures you only enter at a price you find acceptable. A market order during a spread spike fills you at whatever is available, which may be significantly worse than what you intended.
Avoid Trading During Illiquid Hours
If you trade major pairs, the London session and London-New York overlap offer the best spreads. If you trade Asian pairs (AUD, NZD, JPY), the Tokyo session is optimal. Aligning your trading hours with the deepest liquidity for your chosen instruments directly reduces spread costs.
Set Wider Stop Losses During Volatile Periods
If you are already in a position during a news event, a tight stop loss is vulnerable to being triggered by a momentary spread spike, not by genuine price movement against you. Some traders widen their stops temporarily before events, while others simply avoid holding positions through high-impact releases.
Monitor Your Broker's Live Spreads
Many brokers display historical spread data on their websites or allow you to observe live spreads in their platform. Before committing to a broker, watch their spreads across different sessions and during one or two news events. A broker advertising "spreads from 0.0 pips" may indeed offer that during quiet London hours, but their spreads during NFP could be significantly worse than a competitor.
Real-World Examples
NFP Release, February 2024
During the Non-Farm Payrolls release on February 2, 2024, the US economy added 353,000 jobs, far exceeding the 185,000 consensus forecast. EUR/USD spreads on variable-spread brokers expanded from approximately 0.6 pips to 8–12 pips in the seconds before the release and remained above 3 pips for approximately two minutes afterward. The pair moved 70 pips in the first 60 seconds of trading.
FOMC Rate Decision, December 2023
The Federal Reserve held rates steady in December 2023 but signaled three rate cuts in 2024, surprising markets that expected fewer. EUR/USD spreads widened to approximately 6–10 pips at the announcement. More notably, spreads remained elevated for nearly 30 minutes as Chair Powell's press conference introduced additional uncertainty.
Key Takeaways
- Spread widening occurs when liquidity decreases or volatility increases. It is a structural feature of the market, not a broker malfunction.
- The most predictable widening happens around scheduled news events, NFP, FOMC, ECB, BOE, and other high-impact releases. Check the economic calendar daily.
- Variable spread brokers offer tighter spreads during calm markets but wider spreads during events. Fixed spread brokers offer consistency at a higher average cost.
- Spread widening directly increases your trading costs. A spread spike can turn a profitable entry into a losing trade.
- Limit orders protect you from adverse fills during wide-spread periods. Market orders during spikes fill at whatever price is available.
- Trade during peak liquidity hours for your instruments, London-New York overlap for major pairs, Tokyo session for Asian pairs.
- Factor spread costs into your risk management, especially for short-term strategies where spreads consume a significant percentage of your target profit.
This lesson is for educational purposes only. It does not constitute financial advice. Trading forex involves significant risk of loss and is not suitable for all investors.