Autumn is one of the most beautiful times to live in Colorado. Hillsides turn stunning shades of gold, orange and red. Sometimes it seems to happen almost overnight. Leaves change color each fall when they stop photosynthesis so they can rest for the winter when there isn't enough sunlight. The green chlorophyll fades, leaving behind the others colors that had been hidden the rest of the year. Typically, colors peak in Colorado's northern mountains throughout the month of September. The central mountains peak the last week of the month. For our southern mountains, it’s the first week of October. READ MORE: https://www.9news.com/article/weather/fall-colors/fall-leaves-colors-changing-aspens-colorado/73-3ad10ba3-3907-42ef-84cd-4fbb03233f9b More local videos here: https://bit.ly/2Pa0d1l Subscribe to NEXT: http://bit.ly/2eP1GwI Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.