September 1st will mark the start of fall, meteorological fall that is. Meteorologists use a slightly different timeline for seasons compared to the astronomical seasons we learned in school.

The first day of autumn, caused by the fall equinox, happens on Sunday, September 22, 2024. The equinox happens when the sun's rays square up with Earth so the day is about as long as night.

DENVER (KDVR) — The fall equinox isn’t until the end of September, meaning astronomical fall hasn’t arrived yet. But even with the summer-like weather and green leaves, many people believe ...