What Is a Bear Market? Definition, History & How to Invest Through One

A bear market is officially defined as a decline of 20 percent or more from a recent high in a major stock index, sustained over at least two months. The National Bureau of Economic Research (NBER) and financial analysts use this threshold to distinguish bear markets from ordinary corrections.

The S&P 500 is the most commonly cited benchmark for U.S. bear markets, but the term applies to any broad index (Dow Jones Industrial Average, Nasdaq Composite, Russell 2000) or asset class (bonds, real estate, commodities) that meets the criteria. Individual stocks can enter their own bear markets independent of the broader market; a tech stock falling 50 percent while the S&P 500 rises is in a bear market, even if the index is not.

Recovery periods also vary. After the median bear market, it takes 12 to 24 months for the index to regain its previous peak.

Bear markets result from a confluence of economic, financial, and psychological factors. Recession is the most common trigger: when GDP contracts, corporate earnings fall, unemployment rises, and investor confidence collapses.

Investor psychology amplifies the decline. As prices fall, fear and loss aversion trigger selling, margin calls force liquidations, and negative headlines create a self-reinforcing cycle.

Bear markets test discipline but also create long-term buying opportunities. History shows that investors who continue systematic contributions—such as dollar-cost averaging into a 401(k) or IRA—accumulate shares at lower prices, positioning themselves for gains when markets recover.

Defensive strategies include rebalancing your portfolio to your target asset allocation. If your 60 percent stock / 40 percent bond mix has shifted to 50/50 due to stock declines, rebalancing means buying stocks (now cheaper) and selling bonds (relatively stable), which enforces the "buy low" principle.

Sector rotation can help. Consumer staples (food, household products), utilities, and healthcare tend to hold up better in downturns because demand remains steady.

Market timing—selling before a bear market and buying back at the bottom—sounds appealing but is notoriously difficult. Research by Morningstar and Dalbar shows that individual investors who attempt timing typically underperform buy-and-hold investors by 2 to 4 percentage points per year, largely because they sell after declines have already happened and re-enter after recoveries are underway.

Professional fund managers, with vast resources and real-time data, rarely beat the market consistently through timing. The S&P Dow Jones Indices SPIVA scorecard shows that over 15-year periods, more than 90 percent of actively managed U.S. equity funds underperform their benchmarks.

A more practical approach is tactical asset allocation: gradually reducing equity exposure as valuations reach extremes or increasing bond allocations as you near retirement, rather than trying to predict exact turning points. Maintaining an emergency fund of 3 to 6 months' expenses in cash or short-term bonds ensures you won't be forced to sell stocks at depressed prices to cover living costs.

Early stages of recovery are often the most explosive. After the 2020 bear market trough in March, the S&P 500 gained more than 60 percent over the following 12 months.

Recognizing the end of a bear market in real time is nearly impossible. The official bottom is only confirmed months later, when the index has risen 20 percent from the low.

If you're approaching retirement or already retired, bear markets require careful cash flow planning. Financial advisors often recommend a "bucket strategy": keeping 1 to 3 years of living expenses in cash or short-term bonds, so you can avoid selling stocks during a downturn.

How much does the average bear market drop?

The average bear market sees the S&P 500 fall between 30 and 35 percent from peak to trough, though individual bear markets range from the 20 percent threshold to declines exceeding 50 percent, as occurred in 2007–2009 and the early 1970s.

Can you make money in a bear market?

What is the difference between a bear market and a recession?

A bear market is a 20 percent decline in stock prices, while a recession is two consecutive quarters of negative GDP growth. Bear markets and recessions often overlap, but not always; stocks can enter bear territory due to valuation concerns or rate hikes without an economic contraction, and recessions can occur with smaller stock declines.

How do I know if we're in a bear market right now?

Check the current level of the S&P 500 against its most recent all-time high. If the index is down 20 percent or more and has remained below that threshold for at least two months, the market is in bear territory.

Should I sell my stocks during a bear market?

What is a bull market vs bear market?

A bull market is a sustained rise of 20 percent or more in stock prices, typically accompanied by economic expansion, rising corporate earnings, and investor optimism. A bear market is the opposite: a 20 percent or greater decline, often tied to recession, fear, and falling earnings.