Every spring, an old market adage makes the rounds: “Sell in May and go away.” It’s catchy, it sounds like insider wisdom, and it can be tempting to treat it like a rule.
But like many Wall Street sayings, it’s best understood as a historical observation—not a plan. Here’s what it means, where it comes from, and how to think about it in the context of a long-term financial strategy.
What does “sell in May and go away” mean?
The phrase suggests that investors should sell stocks in May, sidestep the market during the summer months, and then re-enter later in the year—often around fall.
The idea is based on the belief that markets have historically delivered stronger returns from roughly November through April than from May through October. In short: “The best months are winter; the weaker months are summer.”
You may also hear an extended version: “Sell in May and go away, come back on St. Leger’s Day,” a reference to a September horse race in the U.K. In other words, the concept has been around for a long time.
Where did this idea come from?
There’s a reason seasonal patterns show up in market history: investor behavior is often seasonal.
- Lower trading activity in summer: Vacations, lighter corporate news cycles, and lower trading volumes can sometimes lead to choppier markets.
- Earnings and economic cycles: Many major announcements cluster around certain times of the year, and expectations can shift as the calendar changes.
- Human nature: Investors tend to look for patterns—especially after a few years when a trend appears to “work.”
Importantly, none of these are guarantees. Market moves are driven by a wide range of factors—economic data, interest rates, inflation trends, corporate earnings, geopolitical events—and those don’t follow a neat seasonal script.
Does it actually work?
Sometimes the market does soften in the summer. Other times, the summer months deliver meaningful gains.
The larger issue is that even if a seasonal pattern exists in the long run, it can be difficult (and costly) to capture in real time. The market doesn’t send an invitation when it’s the “right” day to sell or buy.
Here are a few practical challenges of trying to follow the saying:
- You have to be right twice. You must sell at a good time and buy back at a good time.
- Some of the market’s best days can happen unexpectedly. Missing a small number of strong days can have an outsized effect on long-term results.
- Taxes and transaction costs can reduce returns. Selling appreciated investments in taxable accounts may trigger capital gains taxes.
- Your plan can become reactive. Seasonal headlines can push investors toward decisions based more on fear or folklore than on their goals.
A better question: What does this mean for your plan?
For most long-term investors—especially those approaching or in retirement—the key isn’t whether summer is “usually weaker.” The key is whether your portfolio is positioned appropriately for:
- your timeline (when you’ll need the money),
- your income needs,
- your comfort with risk and volatility,
- and today’s broader market environment (interest rates, inflation, and valuations).
If you’re still accumulating (typically pre-retirees)
If you’re 5–15 years from retirement, market pullbacks—whenever they happen—can be frustrating but may also create opportunities to rebalance or continue investing at lower prices.
A seasonal saying shouldn’t derail consistent saving, prudent diversification, and a portfolio aligned to your goals.
If you’re retired or near retirement
If you’re drawing income, the bigger risk often isn’t “summer weakness.” It’s sequence-of-returns risk—the possibility of experiencing significant market declines early in retirement while taking withdrawals.
Rather than trying to time the calendar, many retirees benefit from planning steps such as:
- Keeping an appropriate cash reserve or short-term bond allocation for near-term spending needs.
- Using a withdrawal strategy that doesn’t force selling stocks after a drop.
- Maintaining a diversified mix of assets, so your plan isn’t dependent on any single market outcome.
What to do when you hear “sell in May”
Instead of treating it as a trigger to sell, consider using the headline as a reminder to do the kinds of things that actually improve outcomes over time:
- Review your allocation. Has the market moved your stock/bond mix away from target?
- Rebalance if needed. Rebalancing is a disciplined way to “buy low/sell high” without trying to predict the future.
- Re-check your cash needs. If you’ll need funds in the next 6–24 months, make sure those dollars aren’t taking more risk than necessary.
- Revisit your risk tolerance. If market volatility is keeping you up at night, the answer is usually portfolio design—not seasonal timing.
- Stay focused on your goals. A retirement plan, college plan, or legacy plan wins by staying consistent through different market conditions.
Bottom line
“Sell in May and go away” is a well-known market phrase rooted in past seasonal patterns. But it’s not a reliable roadmap for what markets will do next—and acting on it can introduce new risks, taxes, and timing mistakes.
A more dependable approach is to focus on what you can control: diversification, rebalancing, budgeting for cash needs, and a strategy built around your personal timeline.
If you’d like to talk through how your portfolio is positioned for the months ahead—and how it supports your long-term goals—I’m happy to help.
This article is for informational purposes only and is not investment, tax, or legal advice. Investing involves risk, including the possible loss of principal.