Commuters spotted the free-roaming nags gathering at the mobile refreshment van in the hope of getting a frozen treat.
Three of the sweltering horses formed an orderly queue at Winstone’s ice cream on Minchinhampton Common, Glos.
Visitors are asked not to feed the animals so it is thought they were given a cool drink instead.
James Marling, 33, spotted the horses and took a picture on his way to work.
He said: “That ice cream van is always there but I’ve never seen horses gather at it.
“I think they were feeling the heat like us, and were hoping to get some help to cool down.”