The Whirley Street kids are the kids on the "next neighborhood over", Whirley Street. Greg and Rowley are always trying to ambush or prank them, but they always get pranked instead. In the first book, Greg and Rowley make a huge snowball and plan to run down the Whirley Street kids with it, but Frank destroys the snowball with a snow shovel after Greg ruins Manny's miniature snowman. Shortly after, the Whirley Street kids throw snowballs at Greg and Rowley. In The Last Straw, Greg's neighborhood's bus is rerouted to Whirley Street. The Whirley Street kids "make monkey noises" on the bus at Greg and Rowley, which bothers Greg because it's "what we always used to do to them when we passed by".