Here's a number that should change your TrendlineA trendline is a straight line drawn connecting two or more swing highs (in a downtrend) or swing lows (in an uptrend) that defines the slope and trajectory of a price trend — price bouncing off a trendline is a potential entry signal, whilRead definition → trading strategy: on purely random price data, 13.5% of third touches still held. In a DayTradingToolkit simulation of 20,000 sessions, random noise drew rising lines, tagged them a third time and bounced with no TrendA trend is a sustained directional movement in price over time — an uptrend is characterized by a sequence of higher highs and higher lows, a downtrend by lower highs and lower lows — and correctly identifying the current trend direction isRead definition → behind them at all. A simulated uptrend only raised that to 18.9%.

So a third touch isn't proof of anything. Traders see a line with three touches and feel certain, but chance alone will hand you that picture often.

A line still earns its place, as a map of where to look. This playbook shows you how to draw one properly, how to turn a touch into an actual trade, and when the line is done.

Strategy snapshot

Trend continuation (trendline bounce)
Timeframe
5-min and 15-min charts
Best time (ET)
10:00 to 11:30 a.m., then 2:00 to 3:30 p.m.
Typical hold
20 to 90 minutes
Difficulty
intermediate
Works best when
An existing trend with two clean, rising swing lows and a confirmed bounce at the next touch
Markets
Liquid US stocks, ETFs and index futures
Win rateA touch alone held 14% to 19% of the time; confirmation is required
Reward to risk2R, or the prior swing high
Touch figures come from a DayTradingToolkit simulation, not live trading results.

In 30 seconds

  • A trendline trading strategy draws a line through rising swing lows in an uptrend, then trades a confirmed bounce at the next touch.
  • Two points draw a line. The third touch is the first real test, and it's where the trade starts.
  • In our simulation, third touches held about 14% of the time on random data and 19% in an uptrend, so a touch alone is never an entry.
  • Buy one cent over the candle that bounces, stop a few cents under the line, and exit on a full candle close below it.

What is a trendline and why do traders use it?

A trendline is a straight line drawn through at least two rising swing lows in an uptrend, or two falling swing highs in a downtrend, then extended forward as a place where price may react. It's a picture of the trend's slope. It isn't a physical barrier.

Why might price react there at all? Part of it is that the line sits where buyers have stepped in twice already, at rising prices, so the same kind of buyer may step in again. Part of it is plain attention: other traders can see the same line.

Who's on the other side when you buy a bounce? Sellers who think the trend has gone far enough, plus anyone taking profits. A line doesn't stop them. Only buyers do. That's why this playbook waits to see those buyers before it risks anything.

Research on chart reading gives modest backing. One study used an algorithm to detect classic chart patterns and found that several carried some extra information about returns (Lo, Mamaysky and Wang, 2000). A wider survey found that most modern studies report profits from technical rules, while warning about data snooping and ignored costs (Park and Irwin, 2007). Neither tests trendlines directly, so treat a line as a working tool.

A horizontal level is a close cousin. If you're unsure of the difference, read our Lesson: support and resistance.

How do you draw a valid trendline?

You draw a valid trendline by connecting two confirmed swing lows that rise, with room between them, and with no candle closing through the line along the way. The rules below remove most of the wishful thinking.

  1. Start with confirmed swings. A Swing LowA swing low is a trough on a chart: a candle whose low sits below the lows of the candles on both sides of it.Read definition → needs higher lows on both sides. Our guide to higher highs and higher lows has the exact rule.
  2. Use lows for uptrends, highs for downtrends. Don't connect closes one day and wicks the next. Pick one and stay with it. Most traders use the wicks.
  3. Leave space. The two points should be at least 10 candles apart. Two swings close together will fit almost any angle.
  4. Check the middle. No candle should close through the line between the two points. If one does, the line is wrong.
  5. Watch the angle. A very steep line breaks soon, because no trend can keep that pace. A nearly flat one is barely a trend.
  6. Don't redraw it to fit. Once you've drawn the line, leave it. Moving it after a break is how you avoid admitting you're wrong.

When does it work, and when should you skip it?

The trendline bounce works in steady, orderly trends with evenly spaced swings, and it fails on fast momentum moves, which leave the line far behind, and in sideways markets, where lines break as soon as you draw them.

Trade it when
The trend has a clear staircase of swings
Skip it when
Swings are messy or overlapping
Trade it when
The line has a moderate slope
Skip it when
The line is nearly vertical
Trade it when
Price reaches the line on lighter volume
Skip it when
Price arrives on heavy selling
Trade it when
A candle closes back up off the line
Skip it when
Candles are closing under it
Trade it when
There's room to the prior high
Skip it when
The target is less than 1.5 times your risk
Trade it when
It's the third or fourth touch
Skip it when
The line has been touched many times and is getting chewed through

What are the exact rules?

The exact rules are: draw the line from two confirmed swing lows, wait for price to touch it on lighter VolumeVolume is the total number of shares (or contracts) traded during a given time period — it's the primary confirmation tool for all price action, because a price move accompanied by high volume indicates genuine market participation, while tRead definition →, buy one cent over the first candle that closes green off the line, stop a few cents under the line, and take half at 2R or the prior high.

Trendline bounce

10:00 to 11:30 a.m. ET, and 2:00 to 3:30 p.m. ET
Conditions
Two confirmed rising swing lows at least 10 candles apart; no closes through the line; price reaches it on lighter volume
Stock selection
Liquid US stocks over $5 with average daily volume above 1 million shares, or SPY and QQQ
Entry
Buy-stop one cent over the high of the first candle that touches the line and closes green
Stop
A few cents under the line at the touch, and under that candle's low
Target
Sell half at 2R or the prior Swing HighA swing high is a peak on a chart: a candle whose high sits above the highs of the candles on both sides of it.Read definition →, whichever comes first; trail the rest under the rising line
Invalid if
A full candle closes under the line before entry
Time stop
Exit if neither the stop nor 2R is hit within 45 minutes
Short version
Mirror every rule on a falling line drawn through lower highs

What does a real setup look like?

A real trendline bounce looks like a stock that rises in even steps, with each dip stopping a little higher than the last, and a third dip that tags the line and turns. The ticker and prices below are made up so the rules are easy to see.

Touches one and two draw the line. Touch three is the trade, with the stop under the line.

XYZ: a third-touch bounce

  1. First swing low

    XYZ prints a swing low at $50.32, then climbs to about $51.60.

  2. Second swing low

    A dip stops at $51.08, higher than the first. You draw the line through both lows. It rises about 5 cents per 5-minute candle.

  3. Third touch

    After a high near $52.50, price drifts back to $51.86, just above the line at about $51.79. Volume is light and the candle closes green with a high of $51.95.

  4. Entry

    The buy-stop fills at $51.96. The stop is $51.71, so risk is $0.25 a share. The prior high at $52.50 is about 2.2R away, and 2R is $52.46.

  5. First target

    XYZ trades through $52.46. Sell half and move the stop on the rest to breakeven.

  6. Trail

    Keep the rest while price stays above the rising line, and exit on a full candle close under it.

Size from the stop: $100 of risk divided by $0.25 is 400 shares. Our position size calculator handles the arithmetic.

How do you manage the trade?

You manage a trendline trade by using the line itself as a moving stop after the first partial, which gives you a simple rule that rises with price. Unlike a horizontal level, the line keeps climbing, so it tightens on its own.

  1. Before 2R: leave the fixed stop in place.
  2. At 2R or the prior high: sell half and move the stop on the rest to breakeven.
  3. Trailing: each candle, the line sits a little higher. Exit on a full candle close under it. Wicks through the line don't count.
  4. Acceleration: if price leaves the line far behind, draw a steeper line from the newest swing lows and trail under that, or trail under each higher low.
  5. Time stop: exit after 45 minutes with no progress.

Is this an A+ setup, a B, or a skip?

An A+ trendline trade has an evenly spaced line, a moderate slope, a light-volume third or fourth touch and a level that agrees with it. Missing one element makes it a B. Missing two makes it a skip.

Criterion
Swing spacing
A+
Even, 10 or more candles apart
B (half size)
Uneven
Skip
Clustered
Criterion
Slope
A+
Moderate
B (half size)
Fairly steep
Skip
Near vertical or flat
Criterion
Touch number
A+
Third
B (half size)
Fourth
Skip
Fifth or later
Criterion
Volume into the touch
A+
Under half the push's
B (half size)
Somewhat lighter
Skip
Equal or heavier
Criterion
Agreement
A+
VWAP or an EMA sits at the line
B (half size)
Near one
Skip
Alone
Criterion
Room to the prior high
A+
2R or more
B (half size)
1.5R to 2R
Skip
Under 1.5R

Where does the trendline strategy fail?

The trendline strategy fails when you force a line onto a chart, when you buy a touch with no confirmation, and when a clean break ends the trend while you're still hoping. Each of these comes from treating the line as if it were real.

A wick through the line proves little. A full close under it, on rising volume, ends the trade idea.

Redrawing the line after it breaks

You're doing it if
Price closes under your line, so you shift it to touch a lower point and keep holding.
The fix
A close under the line ends the trade. Exit first. If you want to draw a new line later, treat it as a new trade with new rules.

Buying the touch

You're doing it if
You leave a limit order on the line and get filled in a falling candle, often right before it slices through.
The fix
Most touches failed in the simulation. Wait for a candle to close green off the line, then buy over its high.

Drawing lines until one fits

You're doing it if
Your chart has six lines at different angles, and at least one of them always seems to be working.
The fix
Allow one line per trend, drawn with the rules above. If it takes more than a minute to find, there's no clean line on that chart.

Fast breaks also bring slippage. A stop order becomes a market order when triggered, so the fill can differ from your stop price (Investor.gov: stop order).

What are the honest numbers?

The honest numbers show that touches are common, holds are rare, and that an uptrend only helps a little if you buy the touch alone. A DayTradingToolkit simulation (fixed seed 14) built 20,000 random price paths of 160 five-minute candles with no trend, and 20,000 more with a small upward drift. It drew a line through the first two rising swing lows at least 10 candles apart, then followed it forward. A touch "held" if the next six candles all closed above the line.

Test
Valid lines found
Random data
7,531
Simulated uptrend
8,452
Test
Lines that got a third touch
Random data
97.0%
Simulated uptrend
84.3%
Test
Third touches that held
Random data
13.5%
Simulated uptrend
18.9%
Test
Fourth touches that held, after a third held
Random data
15.4%
Simulated uptrend
19.8%

Most third touches failed even in the uptrend. The line is a place to look, and it does not predict anything alone.

Three things stand out.

Almost every random line got a third touch. Rising lines through noise get touched as a matter of course, so a touch tells you very little.

Holds were rare in both worlds, and the gap between random data and an uptrend was only about 5 percentage points. Six closes above a line is a strict test, so a looser one would give bigger numbers for both, but the small gap would remain. The line alone can't tell you whether a trend exists.

A hold didn't make the next touch much stronger: 19.8% after a third touch held, against 18.9% before it. The popular idea that a line gets stronger with each touch finds no help here.

Why trade lines at all, then? Because the value comes from what you add: a real trend behind it, light volume into the touch, a candle that proves buyers came, and a stop that's close and easy to define. The line gives you the location. The rest of the checklist supplies the edge, if there is one. The model is simple and has no news or volume, so use it as a warning. It doesn't measure any live strategy.

What are the main variations?

The main variations use the same line in a different way: as a channel, as a break, or as a retest.

Price channels. Copy your rising line up to the highest swing high between the two lows, and you have a price channel. The lower line gives entries, and the upper line gives a natural place to take profits. If price stops reaching the upper line, the trend may be tiring.

The trendline break. A full close through a well-respected line can signal a change of trend. It's a reversal idea and needs a lower high first, so don't short the break by itself. Our reversal trading playbook covers those rules.

The break and retest. After a downtrend line breaks, price often returns to test it from above. That's similar to the breakout retest strategy.

The steeper line. When a trend speeds up, draw a second, steeper line from newer swings. Fast lines break sooner, so use them for trailing only.

How do trendlines compare with moving averages?

A trendline is a fixed straight line that you draw from chosen points, while a moving average is calculated from every candle and curves with price. Lines give a cleaner picture of slope, and averages take the judgment out.

Set by
Trendline
You
Moving average
A formula
Horizontal level
Prior highs and lows
Moves with price?
Trendline
Only along its slope
Moving average
Yes
Horizontal level
No
Judgment needed
Trendline
High
Moving average
Low
Horizontal level
Medium
Best market
Trendline
Steady trends
Moving average
Any trend
Horizontal level
Ranges and breakouts
Main weakness
Trendline
Subjective
Moving average
Lag
Horizontal level
Ignores slope

When a trendline and a moving average meet at the same price, the touch gets more interesting. For the rules of the average itself, see moving average trend following. For the wider map, see the trend following guide, and for the checklist that fits most levels, see the pullback trading strategy.

Pre-trade checklist

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Key takeaways

  • Two points draw the line. It proves nothing until a third touch, and that touch proves little on its own.
  • Draw one line, with fixed rules, and never redraw it to save a trade.
  • Buy the confirmed bounce, never the touch.
  • Exit on a full candle close under the line, and ignore wicks.
  • Random data produced third touches on nearly every line, so let volume, trend and confirmation do the work.

Frequently asked questions

How many touches make a valid trendline?
Two points draw a line and a third touch tests it. Many traders call a line valid after three touches, but our simulation found that random data reached a third touch on 97% of lines. So the count alone proves little, and confirmation matters more.
Should trendlines be drawn on wicks or candle bodies?
Either works if you stay consistent, and most traders use the wicks because they mark the true extremes. Mixing the two lets you bend a line to fit whatever you want to see. Choose one now and write it into your rules.
What timeframe is best for trendlines?
The 5-minute and 15-minute charts suit day trading. Lines on 1-minute charts break too easily, while lines on daily charts move too slowly to give several intraday trades. A daily line can still be useful as a level to watch.
Are trendlines subjective?
Yes, more than most tools, because two traders can pick different swings. Fixed rules cut that down: confirmed swings, 10 candles of spacing, and no closes through the line. Automated charting tools can apply such rules for you, but they don't make the line more meaningful.
What happens when a trendline breaks?
A break means the trend's pace has changed, and it doesn't always mean a reversal. Price may go sideways, form a lower slope, or roll over. Exit your trade on the break, then wait for a new structure before you act again.
Do trendlines work on log charts?
On intraday charts the difference between log and regular scales is tiny, so it doesn't matter. On multi-year daily charts of stocks with big moves it can change the line a lot. For day trading, use the default and keep it consistent.

More trend playbooks are in the Strategies Hub.

Disclaimer

This playbook is educational and is not financial advice. Trendlines are subjective and they fail often: price can slice through any line, and stops can fill worse than planned. The tickers, prices and simulation here are made up to explain the rules; they aren't a record of real trades or a forecast of results. Read the full disclaimer.

Article Sources

Research and regulator material cited in this playbook, with what each source supports.