Bog turtles mate in spring and nest in summer, females typically laying a group of one to six eggs a year. other than nesting, there is no parental care. The babies grow quickly but may not reach sexual maturity until they are 10 years old. They typically stay in the egg for for 7 to 8 weeks and hatching occurs from July to September. In some places, eggs may overwinter in the nest and hatch in spring when there is an abundant food supply. The nests are often preyed on by skunks and raccoons. The young are only 1 inch long at hatching and are often taken by a variety of birds and mammals.