What exactly is trading American stocks? If you still don’t know what time the U.S. market opens, then you’re not really ready to get into this game yet.

Let’s start with the basics: the NYSE and Nasdaq open from 9:30 AM to 16:00 PM, Eastern Time (ET), Monday through Friday. Compared with Thai time, what time the American market opens depends on the time of year, because the U.S. adjusts for Daylight Saving Time (DST) twice a year.

During DST (approximately March to November), the market opens at 20:30 (8:30 PM) and closes at 03:00 AM of the next day. During the normal period (November to March), the market opens at 21:30 (9:30 PM) and closes at 04:00 AM of the next day. This is something Thai investors need to remember well.

But the most important thing isn’t just knowing the time. The real issue is which part of the market opening hours is the hottest. The first hour after the market opens (Opening Bell) is when Volume peaks. The news that has been building up overnight—earnings reports, economic news, and more—gets released and bursts out all at once. Stocks may surge with a Gap Up by several dozen percent, or plunge with a Gap Down based on the news. That’s the time when day traders go in hard, but it’s also when the risk is the highest.

Another point to watch closely is the release of important economic figures. Whether it’s CPI, Retail Sales, Jobless Claims—these are usually announced about 1-2 hours before the American market opens, and these numbers can shake the market violently.

There’s also another special time you need to know: the Pre-Market (before the market opens) is approximately 15:00-20:30, and the After-Hours (after the market closes) is approximately 03:00-07:00. After-Hours is when companies announce their Earnings Reports, and stock prices can swing sharply. However, liquidity is much lower than during regular trading hours.

As for strategy: during periods when the market is highly volatile (the first and last hours), use Trend Following or Breakout Trading. During the quieter middle of the day, use Range Trading by tracking Support and Resistance levels.

In the end, knowing what time the American market opens is only the starting point. What truly matters is understanding how the market behaves in each time period—how news affects the market—and which strategy you should use accordingly. Once you understand these things, the market opening time won’t just be a number on a clock anymore—it will become a signal for when you need to prepare to enter the real game.