Butterflies, moths and grasshoppers are all abundant, and the warm weather also led to a proliferation of berries, nuts and seeds, the trust's Matthew Oates told the BBC. Bees and crickets were among other winners in "one of the most remarkable wildlife years in living memory," he said.
All this followed a very cold spring, he said.
"We were more than overdue a good summer and eventually we got a real cracker, although it kicked in after the slowest of possible starts.
"The way our butterflies and other sun-loving insects bounced back in July was utterly amazing, showing nature's powers of recovery at their best," he said.
Many birds and mammals also recovered well from the unusually cold spring, he said.
"Importantly, we have seen more winners than losers in our wildlife year, which is a tremendous result considering where we were last year."