Eggs are laid on plants by the adult female butterfly. ... This depends on the species of butterfly. Females lay a lot of eggs at once so that at least some of them survive. Butterfly eggs can be very small.

What time of year do butterflies lay eggs?

Life Cycle Summary

Generations 3 and 4 monarch eggs are laid throughout the northern part of their range in July and August. Some adults move south in late July and August, and may lay eggs as late as October in the southern part of the US.

How many eggs does a butterfly lay?

Butterflies lay an average of between 100 to 300 eggs, although some species may only lay a few dozen, others can lay as many as a 1,000 or more. The butterfly egg is spherical or ovate shaped, varying in color and size.