The cover of "Let 'er Rip, Tumbleweeds!" features a cartoon illustration of two boys, one with a yellow hat and the other with a green hat, standing in a desert landscape with a sign reading "GRIMMY GULCH" and another sign reading "GRIMMY GULCH POP.62". The title "LET 'ER RIP, TUMBLEWEEDS!" is prominently displayed, and the author's name, "TOM K. RYAN", is at the bottom.