I've actually had mine out for a week. I put them out 'cause sometimes there will be a little scout looking for a place to spend the summer. They all come back to my USDA heat zone 6B on April 15 or 16 every year. Don't bother with the pricey Humming Bird mix you can buy - make your own with 1 part white sugar to 3 parts water. No color - they will find it!