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How long does it take young hummingbirds to leave the nest?

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Illustration of a chestnut-collared swift (Cypseloides rutilus) in flight, showing its dark brown body and wings with a distinctive reddish-brown collar around its neck. — Apodiform Chestnut-collared swift (*Cypseloides rutilus*)

Young hummingbirds typically fledge—meaning they leave the nest—in about three weeks after hatching. The total time from the laying of the eggs to the moment the young birds fledge is influenced by the availability of food.1