Using Previous Day High and Low as Key Levels

Of all the reference points available, the previous session’s extremes are the most widely watched. That is the entire reason they function, and it explains both of the ways they behave.

Using previous day high and low as key levels works because of objectivity rather than because of anything intrinsic to the prices themselves.

A Level Is Worth What Its Audience Is Worth

A moving average depends on period, type and timeframe. Two traders with different settings see different levels, so the level only means something to whoever computed that version.

The previous day’s high is not like that. One number, no settings, and every participant arrives at the same figure.

That universality is the mechanism. Price reacts at these levels because a large number of people are watching the same price and acting at it, not because the level has properties of its own.

The same logic explains why round numbers behave similarly. Objectivity attracts attention and attention creates reaction.

The Same Property Makes Them Sweep Targets

There is a consequence traders find uncomfortable.

If everyone can see the level, everyone puts stops just beyond it. Longs stopped below the previous low, shorts stopped above the previous high. That produces a dense cluster of resting orders in a predictable place.

When price reaches that cluster the stops trigger as market orders and accelerate the move briefly. If nothing is behind the acceleration, price returns.

So the previous day high is simultaneously a resistance level and a magnet. Both behaviours come from the same source, and the difference between them is only visible after the touch, in whether price closes beyond the level or returns inside it.

Treat the touch as a question rather than an answer.

Your Previous Day May Not Be Theirs

This is the practical issue almost nobody checks.

The previous day’s high depends on where your broker’s daily candle begins. A server rolling over at midnight on a European reference produces a different high from one rolling at a New York close.

Two traders on different platforms can mark genuinely different levels while both believing they have the previous day high. Daylight saving shifts the boundary again relative to your local clock.

Check where your platform’s daily candle opens and closes. If your levels never work as well as they should, rule this out first.

Using Them Without Overusing Them

Mark them before the session rather than during it. A level identified after price has reached it is not a level, it is an explanation.

Weight them by participation. A previous day high tested during London carries more information than the same level tested at three in the morning, because the answer is being given by more participants.

Check the distance against what remains of today’s expected range. If the previous high sits ninety pips away and the instrument averages seventy, reaching it requires an unusual session.

And place your own stop with the cluster in mind. A stop sitting immediately beyond the previous day high is inside the densest concentration of orders on the chart, which is exactly where a sweep terminates. A little further out costs a fraction more risk and avoids the most crowded price on the level.

Conclusion – Using Previous Day High and Low as Key Levels

using previous day high and low as key levels rests on every participant computing the same figure, which makes them both reaction points and stop clusters. Confirm what your platform treats as a day, mark them in advance, weight them by session, and keep your own stop out of the crowd.

FAQ – Using Previous Day High and Low as Key Levels

1. Why do these levels work at all?

Because they are objective. Everyone calculates the same number, so the level draws attention and reaction from a large audience.

2. Why does price often spike through and reverse?

Stops cluster just beyond the level. Triggering them accelerates price briefly, and if nothing supports the move it returns.

3. Could my levels differ from another trader’s?

Yes. The daily candle boundary depends on server time, so different platforms can produce different previous day highs.

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Additional resources:

Prior-Day High and Low: Trading the Simplest Level | DayTradingToolkit 

Previous Day’s High and Low: How to Trade Using PDH and PDL