Days Until Fall

What Is a Days Until Fall Calculator?

A days until fall calculator counts how many calendar days remain from any start date until the first day of autumn. Fall begins on the autumnal equinox, when day and night are roughly equal in length. This tool uses astronomical equinox dates for accurate seasonal countdowns.

Fall marks the transition from summer warmth to winter cold. Leaves change color, harvest season peaks, and daylight hours shorten. Knowing exactly how many days remain helps you plan seasonal activities, travel, and outdoor projects.

How to Use This Calculator

1. Pick your start date. Use today or any date you want to measure from.
2. Select your hemisphere. Northern Hemisphere fall begins in September; Southern Hemisphere fall begins in March.
3. Read the countdown. The tool shows total days until the next autumn equinox with weeks and extra days.

How Fall Start Dates Are Calculated

The first day of fall is the autumnal equinox. In the Northern Hemisphere this falls in September (around September 22 to 23). In the Southern Hemisphere it falls in March (around March 20 to 21).

Because Earth's orbit does not align perfectly with our calendar, equinox dates shift by a day or two over a 400-year cycle. This calculator uses astronomical formulas to determine the correct equinox date for each year.

Why Count Down to Fall?

• Foliage trips: Plan leaf-peeping vacations at peak color.
• Gardening: Time planting, harvesting, and winter prep tasks.
• Wardrobe changes: Swap summer clothes for fall layers on schedule.
• Seasonal events: Organize harvest festivals, school terms, and holidays.

For related seasonal tools, try our First Day of Autumn, Autumnal Equinox Day, or Days Until December.