Previous Day High Low: How Traders Read Yesterday’s Range

Previous day high and previous day low are two of the simplest reference levels on a chart.

The previous day high is the highest price from the prior regular trading session. The previous day low is the lowest price from the prior regular trading session.

Traders often shorten them to:

• PDH for previous day high
• PDL for previous day low

These levels matter because they show where today’s price is trading compared with yesterday’s range.

Is price above yesterday’s high? Is it below yesterday’s low? Is it still inside yesterday’s range? Is it testing one of those levels and failing?

Those questions help turn the current session into a clearer map.

What Previous Day High Means

Previous day high is the highest price a stock reached during the prior regular session.

Traders watch it because it can become an important reference area the next day.

PDH may act like:

• A resistance area
• A breakout level
• A failed breakout area
• A reclaim level
• A retest area after price breaks above it

For example, if yesterday’s high was $2.85 and today’s price pushes toward $2.85, the trader knows price is testing the top of yesterday’s range.

The important question is not only whether price touches PDH.

The better question is what price does there.

Does it reject? Does it break above and hold? Does it break above and fail? Does it reclaim after losing it earlier?

What Previous Day Low Means

Previous day low is the lowest price a stock reached during the prior regular session.

Traders watch it because it can become a support, breakdown, or reclaim reference area the next day.

PDL may act like:

• A support area
• A breakdown level
• A failed breakdown area
• A reclaim level
• A risk area for weak charts

For example, if yesterday’s low was $2.10 and today’s price fades toward $2.10, the trader knows price is testing the bottom of yesterday’s range.

Again, the level itself is only the starting point.

Does price hold PDL? Does it break below and stay below? Does it flush below and reclaim? Does old support become resistance after the break?

That reaction matters more than the label.

Why These Levels Are Useful

Previous day high and low are useful because they are objective.

A trader does not need to force them onto the chart. The prior session already created them.

That makes them different from some hand-drawn levels, where beginners may argue with themselves about which wick or body matters most.

PDH and PDL give the trader a clean frame:

• Above PDH means price is trading above yesterday’s range.
• Below PDL means price is trading below yesterday’s range.
• Inside PDH and PDL means price is still inside yesterday’s range.
• Testing PDH or PDL means price is interacting with a known reference level.

This helps new traders understand location before reacting to candles.

Regular Session Versus Extended Hours

Chart settings matter.

Some platforms calculate previous day high and low from the regular trading session only. Others may include premarket or after-hours data depending on settings.

For most active stock traders, PDH and PDL usually refer to the prior regular session. Premarket high and low are separate levels.

That separation keeps the chart cleaner:

• Previous day high and low show yesterday’s regular session range.
• Premarket high and low show today’s extended-hours range before the open.

A trader can use both, but they should not mix definitions from one trade to the next.

If the chart includes extended hours, make sure the levels mean what you think they mean.

Opening Above Or Below Yesterday’s Range

Where price opens compared with PDH and PDL can change the read.

If a stock opens above PDH, it is starting the session above yesterday’s entire range. That may bring attention, but the trader still needs to watch whether price holds above PDH or falls back inside the range.

If a stock opens below PDL, it is starting below yesterday’s entire range. That may show weakness, but the trader still needs to watch whether price stays below PDL or reclaims it.

If a stock opens inside yesterday’s range, PDH and PDL may become the upper and lower reference points for the session.

The open gives the starting location. The reaction gives the useful information.

Failed Breakout At Previous Day High

A failed breakout at PDH happens when price pushes above the previous day high but cannot stay above it.

This can happen when price breaks above a very obvious level, attracts late entries, then falls back under the same area.

A failed PDH breakout may show:

• PDH was clear before the move.
• Price moved above it.
• Price could not hold above it.
• The candle or next candles moved back below the level.
• The level became a failed breakout area.

The level did not stop being useful. It became useful in a different way.

It showed where price tried to leave yesterday’s range and failed.

Previous Day Low Reclaim

A previous day low reclaim happens when price breaks below PDL, then moves back above it.

This can matter because price first showed weakness below yesterday’s range, but then won the level back.

A PDL reclaim may show:

• Price lost yesterday’s low.
• Sellers could not keep price below it.
• Price moved back into or above yesterday’s range.
• The next candles held above the reclaimed area.

The key question is whether price can stay back above PDL. A quick reclaim that immediately fails is different from a reclaim that holds and builds.

Realistic Example

A stock traded yesterday between $2.10 and $2.85.

Today, it opens near $2.70 and pushes toward $2.85.

A trader may mark:

• $2.85 as previous day high
• $2.10 as previous day low

If price reaches $2.85, the trader can watch how it behaves around the top of yesterday’s range.

A cleaner strength read might show:

• Price breaks above $2.85.
• Volume increases.
• Price holds above PDH.
• A pullback stays near or above the level.

A weaker read might show:

• Price spikes above $2.85.
• Volume fades.
• Price falls back below PDH.
• The move becomes a failed breakout.

Later, if the stock fades toward $2.10, PDL becomes the lower reference area. Holding $2.10, losing it, or reclaiming it after a flush all tell different stories.

Day Trading Versus Swing Trading Context

Previous day high and low are usually most useful for day traders, especially around the open.

Day traders may use PDH and PDL to:

• Build a premarket level map
• Read whether price is inside or outside yesterday’s range
• Watch breakout attempts above PDH
• Watch breakdown attempts below PDL
• Study failed moves back into the prior range

Swing traders can still use these levels, but they usually care more about larger daily and multi-day levels.

For a swing trader, one previous day high may matter less than a multi-day resistance zone. For a day trader, PDH may be one of the first levels marked before the session starts.

The timeframe and trade style decide how much weight the level deserves.

What Beginners Usually Get Wrong

The biggest mistake is treating PDH and PDL like automatic triggers.

They are not triggers. They are reference points.

Common mistakes include:

• Buying just because price breaks PDH
• Shorting just because price breaks PDL
• Ignoring whether price holds the level
• Ignoring premarket context
• Chasing far above PDH after a large move
• Ignoring a failed breakout back below PDH
• Ignoring a reclaim back above PDL
• Mixing regular-session and extended-hours levels
• Treating the exact penny as more important than the reaction zone

PDH and PDL help frame the chart. They do not replace the read.

What To Watch Around PDH And PDL

When price reaches previous day high or low, watch the reaction.

At PDH, ask:

• Does price reject from yesterday’s high?
• Does price break above and hold?
• Does price break above and fail back below?
• Is volume increasing into the level?
• Is price already extended before reaching it?

At PDL, ask:

• Does price hold yesterday’s low?
• Does price break below and stay below?
• Does price break below and reclaim?
• Is volume expanding during the break?
• Is the stock already extended into a larger support area?

The level is objective. The reaction is what teaches the trader.

How This Helps When Studying Charts Or Trades

Previous day high and low help traders study whether today’s decision happened inside, above, or below yesterday’s range.

When looking back at a chart or completed trade, ask:

• Were PDH and PDL marked before the session?
• Was price opening above, below, or inside yesterday’s range?
• Did price hold above PDH or fail back below it?
• Did price lose PDL or reclaim it?
• Was the entry near the level or after the move was already extended?
• Did the trader respect the reaction around the level?

This keeps the lesson practical. PDH and PDL are not complicated levels, but they can explain a lot about price location.

Key Takeaway

Previous day high and previous day low show yesterday’s range.

They help traders understand whether today’s price is trading above, below, or inside that range. The useful read comes from the reaction: hold, break, reject, reclaim, or fail.

Mark the levels before the session. Then watch what price does around them.

Related Lessons

• Key Levels Trading
• Pivot Levels
• Support and Resistance
• Premarket High Low
• High of Day
• Breakout Trading
• Breakdown Trading

FAQ

What does previous day high mean?

Previous day high is the highest price from the prior regular trading session.

What does previous day low mean?

Previous day low is the lowest price from the prior regular trading session.

Why do traders watch previous day high?

Traders watch previous day high because it marks the top of yesterday’s range and can become a breakout, resistance, failed breakout, or reclaim reference area.

Why do traders watch previous day low?

Traders watch previous day low because it marks the bottom of yesterday’s range and can become a support, breakdown, failed breakdown, or reclaim reference area.

Should previous day high and low include premarket?

Usually, traders separate regular-session previous day high and low from premarket high and low. Chart settings can vary, so the trader should know how the platform calculates them.

What should beginners watch around PDH and PDL?

Beginners should watch whether price holds, breaks, rejects, reclaims, or fails around those levels instead of assuming the level will automatically work.