Explore the vibrant birdlife at Ron Stewart Preserve at Rabbit Mountain during the fall. Experience the beauty of nature and the joy of birdwatching as we observe the diverse Colorado Front Range bird species. This easy-to-moderate hike of 1 to 2 miles is on uneven trails. Registration for most programs begins on the 20th of the month before the event. Registration required. Register Registration is required through Discover Boulder County, Parks & Open Space’s volunteer and event registration system. If you’re new to the system, you'll need to create an account. But it’s easy and we only use your contact information to communicate about events you register for. We will never sell or give your information to a third party.