Gray Wolf | National Wildlife Federation

Wolves typically mate for life. In the northern United States, they breed from late January through March. The breeding season is earlier for wolves living farther south. Wolves are pregnant for about 63 days and usually birth four to six pups. The wolf pups are usually born in a den. At birth, they cannot see or hear and weigh about one pound.

https://www.nwf.org/Educational-Resources/Wildlife-Guide/Mammals/Gray-Wolf