The question of whether crickets are territorial is purely rhetorical. (Maybe a poem in the making.) My efforts to fall asleep for the past hour have been hampered by one, lone cricket who chirps almost incessantly outside my window. I don't know much about crickets - whether they are good, bad or indifferent to the garden. Perhaps they exist mainly to remind gardeners that fall is on the way and we'd better finish off garden chores soon while we can. I've taken this opportunity to check them out online and see that what I am calling crickets could, if fact, be grasshoppers and that the sound they make is called 'stridulation'. How to Tell a Cricket From a Grasshopper . I don't know if they are truly territorial but sure am glad there's not more than one out there keeping me awake.