In new jersey,Yes!!! The hunters and quad riders/hikers etc use it also.Always check the area because it could be off limits to due hunting permits only or persevere land which means do not take anything of nature home.If you not sure call the town and ask them.
Thanks for the reply, it was the reference of "cornfield" that threw me off as up here if the field is tilled it's usually private land-meaning that somebody owns it and it's not public so permission would be needed.
Same applies for here in nj but there are many field that are not owned or abandoned or left for hunters or deers to eat away.