Brood XIII
17-year cycle · last emerged 2024
2041
next emergence ·
States: IA, IL, IN, WI
Northern Illinois Brood; co-emerged with 13-year Brood XIX in 2024.
Source: USDA Forest Service / UConn. Adults emerge when soil 20 cm down reaches ~18°C (64°F), usually mid-to-late spring.
Next broods to emerge
Brood XXII (13-year)2027Brood XXIII (13-year)2028Brood I (17-year)2029Brood II (17-year)2030Brood III (17-year)2031
Emergence years are well-established; the exact week varies with spring soil temperature. How this works.