Here are some common color variations:
* Summer coat: A more reddish-brown, with the white belly often being tinged with yellow.
* Winter coat: A grayish-brown, with the white belly being more prominent.
* Juvenile coat: A darker, more reddish-brown, with less white on the belly.
While the most common color is a brownish-gray, you might also encounter cottontail rabbits with a reddish-brown, grayish-brown, or even a black coat.