Here a couple good Strawberry Picking  Fields in New Hampshire -

Lull Farm -Hollis NH and Milford NH  -  http://www.lullfarmllc.com/index.html - they have a great farm stand that has bread, dips, all different kinds of food, bake goods are either brought in from business close by or made on location. 

This is also a great farm for other pickings Apple, Pumpkins and great Farm Stand - worth the drive.

Sunnycrest Farm, Inc. http://www.sunnycrestfarmnh.com/fa.html
59 High Range Road
Londonderry, NH 03053
Ph: 603-432-9652/7753

Brookdale Fruit Farm Inc. - http://www.brookdalefarms.com/default.asp - They also have an ice cream stand, and a nice farm stand, 
38 Broad Street
Hollis, NH 03049
Ph: 603-465-2240

Parlee Farms (Pick Your Own)
95 Farwell Road
Tyngsboro, MA
(978) 649-3854
http://parleefarms.com/

This place is worth the trip depending on what way your coming from - NH  - right next to Nashua - this place has  a great farm stand with baked goods, ice cream stand, and they have animals you can feed so remember the quarters. Expect to stay for a couple of hours they have tables to have lunches at, this place is enjoyable for the whole family.