Which Cicada Brood Is the Largest?

Brood X (X is 10 in Roman numerals) is the largest brood of 17-year cicadas. This brood is found in three separate areas centering around Pennsylvania and northern Virginia, Indiana, and eastern Tennessee. The largest emergence of Brood X appears as adults only once every 17 years.

When was the last big cicada year?

Brood X is the name for the big generation of cicadas due in the spring of 2021, just as in 2004 and 1987.

What is the largest cicada?

The largest, the empress cicada (Megapomponia imperatoria), has a head-body length around 7 cm (2.8 in), and its wingspan is 18–20 cm (7–8 in).