Golden Cross and Death Cross: What They Are and Why They Lag

The golden cross and death cross are two of the most widely quoted signals in technical analysis, and they're both built from just two moving averages.

The Definitions

Golden cross: the 50-day moving average crosses above the 200-day moving average.

Death cross: the 50-day moving average crosses below the 200-day moving average.

Both are usually calculated on a daily chart with simple moving averages, and are most often discussed for major indexes like the S&P 500 and for large stocks.

The 50-day average reflects the intermediate trend; the 200-day reflects the long-term trend. A golden cross means the recent trend has moved above the long-term trend; a death cross means it has dropped below.

How They're Traditionally Read

• Golden cross: read as a bullish signal, that an uptrend may be taking hold.
• Death cross: read as a bearish signal, that a downtrend may be taking hold.

Media coverage often presents them as warnings or buy signals. The mechanics are more modest: each is simply a statement that one average has overtaken another.

An Illustration

Imagine a stock that falls for months, then bottoms and rises. As the rally continues:

1. The 50-day average, which tracks recent prices, starts rising first.
2. The 200-day average, which averages a long stretch of earlier lower prices, is still falling or flat.
3. Eventually the faster 50-day catches and crosses above the slower 200-day. That's the golden cross.

The death cross is the reverse after a peak and a decline.

The Core Problem: They Lag

Because both averages are built from past prices, and the 200-day is very slow, the cross happens after the move has already begun. By the time a golden cross appears, price has typically already risen substantially from its low. By the time a death cross appears, price has typically already fallen.

This has real consequences:

• The signal can arrive late, with much of the move already behind it.
• Death crosses are sometimes followed by recoveries, because they come after a decline has occurred.
• Whipsaws. In sideways markets the averages can cross back and forth, producing a golden cross followed shortly by a death cross.

What the Evidence Says

Studies of crossover strategies have produced mixed results. Commentary often cites average returns following past golden crosses on the S&P 500, but those figures are based on a small number of occurrences and depend heavily on the period chosen, and they can look different in other periods or after costs. There's also a general data-snooping problem with any pattern that's been picked out after the fact. See do chart patterns actually work.

The honest summary: a golden cross is a description of past price action, and treating it as a reliable forecast goes beyond what the evidence supports.

Variations

• Different periods. Some use 20/50, 50/100, or 10/30 crossovers. Shorter periods signal sooner and whipsaw more.
• EMAs instead of SMAs. Exponential averages react faster.
• Confirmation filters. Some wait for price to stay above the averages, or look at volume.
• Different time frames. A golden cross on a weekly chart carries more weight than on an hourly one. See timeframes.

What to Take Away

• A golden cross (50-day above 200-day) and a death cross (50-day below 200-day) are defined mechanically.
• They're lagging signals confirming a trend that has already developed.
• They're prone to whipsaws in sideways markets.
• Evidence for their predictive power is mixed.

For a related trend indicator, see Aroon.

This article is for educational purposes only and is not investment advice.