What Is a Gap in Trading? (And What Happens Next)
A gap in trading is exactly what it sounds like: a hole on the chart where price skipped over a range of prices without trading through them. The close of one candle and the open of the next do not overlap. Price jumped up or down, and that space in between is the gap. If you have ever looked at a chart and noticed the market opened at a completely different price than where it closed the night before, you have seen a gap.
What causes price gaps
Gaps happen when something shifts the balance between buyers and sellers while the market is closed. In futures markets that trade overnight, a gap at the New York open usually means something moved hard during the overnight session. In crypto, which trades around the clock, gaps tend to form at the New York open when the biggest wave of participants arrives and reprices things from where the thin overnight session left them.
The size of the gap tells you something about how strong that shift was. A tiny gap of a few points is noise. A gap of 100 points on a major futures contract means something real happened.
Gap up vs gap down
A gap up means price opened higher than it closed. Buyers came in hard overnight, or good news hit before the open. A gap down is the opposite: price opened lower, usually because sellers were aggressive or bad news arrived. That is the full vocabulary you need for day trading purposes. The categories you see in some textbooks, like breakaway gap or continuation gap, are interesting labels but they are only truly visible in hindsight. In the moment, you cannot know which kind you are looking at.
What is a gap fill?
A gap fill is when price comes back and trades through the range it skipped over. Say the market opened at 21,200 this morning but closed at 21,000 last night. The gap is those 200 points. A gap fill means price eventually trades back down to 21,000 and through it. Some gaps fill on the same day. Some take weeks. Some never fill at all.
There is a popular belief that “gaps always fill.” That is not accurate. Some gaps do fill with high frequency. Others, especially large gaps on strong news or in strong trending markets, can sit unfilled for months. If you build a strategy around the assumption that every gap will fill, you will be wrong often enough to hurt your account.
How day traders actually use gaps
The most useful thing a gap does is set up the first question of the morning: will price try to fill the gap, or will it continue in the direction of the gap? If the market gapped up hard, you are watching whether buyers follow through and push even higher, or whether it immediately starts drifting back toward last night’s close. That early price action in the first 30 to 60 minutes often gives you the answer.
I use the opening range breakout to help answer that question each morning. The first 30 minutes after the open prints the day’s early range. If price breaks out of that range in the same direction as the gap, the continuation trade is often the one to take. If it breaks back through the gap level, the fill trade becomes the focus. The gap gives you context. It is not a trade by itself.
For crypto specifically, the same logic applies, and I walk through the full morning process in my guide to day trading crypto.
The honest truth about gap trading
Gap trading sounds simple: open, see a gap, trade the fill. The problem is that the fill trade can take all day, stop you out multiple times, or never come. Most retail traders blow their morning trying to fade a strong gap and fighting the trend the whole way. The gap is a piece of context, not a signal on its own. You still need a real setup: a price level to enter from, a stop placed logically, and your size calculated from your risk. Without those, knowing the gap exists does not help you at all.
What gaps really give you is a map of contested ground. Price left behind an area where almost no trading happened. Markets tend to return to those areas eventually because that is where price discovery is still incomplete. But “eventually” is not a trading plan.
What to actually do with this
When you sit down in the morning, note the overnight close and the current open. If there is a gap, mark it on your chart. Then watch: does price run away from the gap or drift back toward it? A drift back toward the gap early in the session is a signal that a fill might be coming. But do not act until you also have your setup trigger, your stop placed at a logical level, and your risk sized the same as every other trade. A gap is a starting point for your read, not a shortcut to a trade.
Common questions
What is a gap in trading?
A gap is a space on the chart where price jumped from one level to another without trading the prices in between. The close of one candle and the open of the next do not overlap.
What is a gap fill in trading?
A gap fill is when price later comes back and trades through the range it originally skipped. It can happen the same day or take much longer, and not every gap fills.
Do all gaps in trading fill?
No. Many gaps do fill, especially small gaps in slow conditions, but large gaps on strong news or in strong trends can stay unfilled for weeks or never fill at all.
What is a gap up vs a gap down?
A gap up means price opened higher than it closed the previous session. A gap down means it opened lower. Both are caused by a shift in buying or selling pressure while the market was closed.
How do day traders use gaps?
Traders use the gap level as context for the morning. They watch whether price continues in the direction of the gap or reverses toward the fill, then combine that with a real setup before entering a trade.
Keep reading
I trade and teach this for a living. I post free breakdowns on Instagram and YouTube, and you can trade alongside me and the community at bitcoindaily.vip. For one-on-one help, work with me directly.
Nothing here is financial advice. Trading carries a real risk of loss and most traders lose money. Never trade money you cannot afford to lose.