Spring 2025 in the US: What Date Marks the First Day and Why Does It Change?

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Spring is one of the most anticipated seasons of the year, symbolizing renewal, growth, and warmer weather after the cold winter months. For many people in the United States, the first day of spring marks a time of change, as flowers bloom, trees regain their leaves, and outdoor activities become more enjoyable. But when exactly does spring begin, and why does the date change each year?

In 2025, the first day of spring in the United States will fall on Thursday, March 20. This date marks the vernal equinox, which occurs around March 20 or 21 each year. The vernal equinox is the precise moment when the Sun crosses the celestial equator, moving from south to north.

What is the Vernal Equinox?

The vernal equinox is a key astronomical event that signals the start of spring. The word “equinox” comes from Latin, meaning “equal night,” because on this day, day and night are roughly equal in length, each lasting about 12 hours. After the equinox, days begin to get longer in the Northern Hemisphere, and nights become shorter, which is why we associate this time with the arrival of spring and the increasing warmth of the sun.

Spring 2025: Why Does the Date Change?

The reason the first day of spring doesn’t occur on the same date every year is due to the Earth’s orbit around the Sun. The Earth’s year is not exactly 365 days; it’s approximately 365.25 days. This extra fraction of a day causes the dates of the equinoxes and solstices to shift slightly each year. As a result, the first day of spring in 2026 will be on March 20, and in 2027 it will be on March 19.

Cultural Significance of Spring

For many, the first day of spring isn’t just an astronomical event—it holds deep cultural and emotional significance. Across the world, people celebrate the arrival of spring with various traditions and festivals. In the United States, while there may not be a nationwide holiday marking the first day of spring, it’s often celebrated with activities like spring cleaning, gardening, and enjoying outdoor spaces. Many also look forward to the warmer weather, the blooming of flowers, and the start of outdoor festivals and events.

While the date may change slightly each year, the start of spring continues to be a moment of joy. It symbolizes new beginnings and the promise of warmer weather. Whether you’re planting new flowers, enjoying the outdoors, or simply embracing the change in seasons, the arrival of spring is a time to celebrate the beauty and renewal that comes with it.