From Morris County Park Commission:

Snowshoe Sundays at Pyramid Mountain NHA
Ages 10 & Up.

Get outside and active this winter, and experience the unique and exhilarating sport of snowshoeing! Enjoy a guided trek exploring the beautiful winter scenery and looking for signs of wildlife – all while getting a great workout. No experience is necessary. Please call in advance regarding conditions.
If you already know how to snowshoe or want to venture out on your own, various sizes, including children’s, are available for one-day rental and use at Pyramid Mountain NHA. You must be 18 years or older to rent shoes, and a photo ID or rental deposit of $10/pair per day by cash is required. Shoes can be rented between 9 a.m. and 11 a.m., and must be returned by 4 pm the same day.
Date:Sunday, January 6—Sunday, March 10
Time:1 p.m. if renting shoes, 1:30 p.m. if using your own.
Pyramid Mountain Natural Historical Area, 472 Boonton Avenue, Montville Township (Intersection of Mars Court and Boonton Avenue).
Cost:$5 per person for trek, $15 for trek and snowshoe rental.
Contact:Preregistration is required. To register and for conditions, 973.334.3130.