Periodical Cicadas

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Magicicada broods and distributions

Although nearly all of the periodical cicadas in a given region emerge in the same year, the cicadas in different regions are not synchronized and may emerge in different years. All periodical cicadas of the same life cycle type that emerge in a given year are known collectively as a single "brood" (or "year-class"). The resulting broods are designated by Roman numerals -- there are 12 broods of 17-year cicadas (with the remaining five year-classes apparently containing no cicadas), and 3 broods of 13-year cicadas (with ten empty year-classes). As a result, it is possible to find adult periodical cicadas in almost any year by traveling to the appropriate location. The table below is a guide to the approximate locations of periodical cicada broods. On a local scale, periodical cicadas can be patchily distributed.

Click here for a small-scale composite map of all brood ranges.

Click here for an alternate version of this table organized by year instead of brood.

Click on a brood number in the table below to see a larger-scale map of that brood's range.

17-year Broods

Year

General region

I

1978

1995

2012

2029

VA, WV, TN

II

1979

1996

2013

2030

CT, MD, NC, NJ, NY, PA, VA

III

1980

1997

2014

2031

IA, IL, MO

IV

1981

1998

2015

2032

IA, KS, MO, NE, OK, TX

V

1982

1999

2016

2033

MD, OH, PA, VA, WV

VI

1983

2000

2017

2034

GA, NC, SC

VII

1967

1984

2001

2018

NY

VIII

1968

1985

2002

2019

OH, PA, WV

IX

1969

1986

2003

2020

NC, VA, WV

X

1970

1987

2004

2021

DE, GA, IL, IN, KY, MD, MI, NC, NJ, NY, OH, PA, TN, VA, WV

XI

1937

1954

Extinct

CT

XIII

1973

1990

2007

2024

IA, IL, IN, WI

XIV

1974

1991

2008

2025

KY, GA, IN, MA, MD, NC, NJ, NY, OH, PA, TN, VA, WV

13-year Broods

XIX

1972

1985

1998

2011

AL, AR, GA, IN, IL, KY, LA, MD, MO, MS, NC, OK, SC, TN, VA

XXI

1870

Extinct

FL

XXII

1988

2001

2014

2027

LA, MS

XXIII

1989

2002

2015

2028

AR, IL, IN, KY, LA, MO, MS, TN

Straggling and spurious broods

Sometimes periodical cicadas emerge "off-schedule" by one or more years. This phenomenon is often referred to by the general term "straggling," although straggling cicadas can emerge either later or earlier than expected. Straggling makes it difficult to construct accurate maps of periodical cicada brood distributions, and historical reports of emergences often contain little or no information about how many cicadas were seen. Straggling emergences in which one or two cicadas are present are common; larger unexpected emergences of thousands of individuals have been reported (e.g. Dybas 1969). Stragglers are almost certainly responsible for reports of "spurious broods" that are not generally recognized and that are not listed above.

These maps are intended to portray only approximate, present-day brood distributions. They are based on previously published maps (Marlatt 1923; Simon 1988) and unpublished data. However, they have not been field checked, and they do not portray historical reports of brood emergences. A project is currently underway to make new maps of periodical cicada broods. See the Magicicada mapping project homepage and the Geospatial Data Clearinghouse.
Literature:
Marlatt, C. 1923. The Periodical Cicada. United Stated Department of Agriculture, Bureau of Entomology Bulletin 71
Simon, C. 1988. Evolution of 13- and 17-year periodical cicadas. Bulletin of the Entomological Society of America 34:163-176.
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