When Is Autum — !free!

You might notice the equinox date shifts slightly between the 22nd and 23rd of September. This happens because a solar year (the time it takes for Earth to orbit the sun) isn’t exactly 365 days—it’s about . Our calendar accounts for this with Leap Years, which causes the timing of the equinox to reset and shift slightly over time. 5. What to Expect During Autumn

The leaves of deciduous trees change from green to vibrant reds, oranges, and golds. Migratory birds begin their journey south. The "first frost" settles on the grass in the morning. Animals begin storing food or preparing for hibernation. 4. Why Do the Dates Change? when is autum

Meteorologists and climatologists use a different system. To make record-keeping easier, they divide the year into four quarters based on the calendar months and the annual temperature cycle. You might notice the equinox date shifts slightly

Regardless of the official start date, autumn is defined by several key transitions: The "first frost" settles on the grass in the morning

Ask ten people when autumn begins, and you might get ten different answers. For a farmer, it might start with the first killing frost. For a student, it begins with the return to school. For a nature lover, it’s the moment the first maple leaf turns crimson. The truth is, there is no single, universally accepted answer. Instead, the start of autumn is defined by three primary systems: , meteorological , and phenological (or cultural). Each offers a valid, yet distinct, perspective on when we should hang up our swimsuits and reach for our sweaters.

For most of the world, autumn officially begins on the . This is the moment when the sun crosses the celestial equator, heading south. On this day, day and night are approximately equal in length.

When is Autumn? A Guide to the Season of Change As the sweltering heat of summer begins to fade and a crispness enters the air, one question starts to trend: "When is autumn?" While the answer seems straightforward, the "start" of fall actually depends on whether you are talking to an astronomer, a meteorologist, or a nature lover.