How often do you need to replace nectar in feeders-hummingbirds?

Nectar in hummingbird feeders should be replaced every 3 to 5 days, especially during hot weather, as the sugar solution can spoil quickly. If the feeder is in a shady location, it may last a bit longer, but it's important to check for cloudiness or mold regularly. Additionally, clean the feeder thoroughly with hot water when you replace the nectar to prevent the growth of harmful bacteria.