There are 2 in area C (Carpenter's House).
Then there are 4 in area G3 (Old Crypt) according to the text (and according to the CR which is 5), but in parenthesis it says Wolf Skeletons (2) and not (4), as if there are only 2.
Finally area G10 has 2 of them, but in previous threads I saw people thinking these 2 are part of the 4 in area G3.
It's really unclear to me how many wolves are in total.
I stumbled upon this discrepancy, too.
I just took it to be two wolves in area C, then another two in area G3 and the last two in area G11.
Your PCs should be able to cope with'em.