Cicada Mania

Dedicated to cicadas, the most amazing insects in the world.

January 9, 2021

Periodical cicada Brood X (10) will emerge in 15 states in 2021

Filed under: Brood X | Magicicada | Periodical — Dan @ 1:01 am

Brood X 2021

Periodical cicada Brood X (10) will emerge in the spring of 2021 in Delaware, Georgia, Illinois, Indiana, Kentucky, Maryland, Michigan, North Carolina, New Jersey, New York, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, and Washington D.C.

The last time this brood emerged was in 2004.

What, when, where, and why:


Billions of these insects:

Adult, Nymph, Molting Cicada

  • Black, orange and red Cicada insects with a 17-year life cycle.
  • Some people call them “locusts” but they’re really cicadas.
  • Which species: All three 17-year species, Magicicada septendecim, Magicicada cassini and Magicicada septendecula. How to tell the difference between the species.
  • NOT the green ones that arrive annually.


Typically beginning in mid-May and ending in late June. These cicadas will begin to emerge approximately when the soil 8″ beneath the ground reaches 64 degrees Fahrenheit. A nice, warm rain will often trigger an emergence. Back in 2004, people began reporting emergences around May, 13th.

Other tips: these cicadas will emerge after the trees have grown leaves, and, by my own observation, around the same time Iris flowers bloom:

Magicicada on an iris flower in Scotch Plains by Judy Lanfredi

Magicicada on an iris flower in Scotch Plains by Judy Lanfredi

Where: has the most up to date maps. If you see a cicada and want to report it, the Cicada Safari App is available for Android and Apple devices 📱.

Places = cities, towns, communities, parts, etc. where people told us they emerged back in 2004.

  • Delaware counties: Kent, Sussex
  • Delaware places: Newark, Wilmington
  • Georgia counties: Union, White
  • Georgia places: Blairsville, Ellijay, Norcross
  • Illinois counties: Edgar, Clark, Crawford, Vermilion
  • Illinois places: Marshall
  • Indiana counties: Brown, Clark, Clay, Columbus, Crawford, Daviess, Dearborn, Dubois, Fountain, Gibson, Greene, Jackson, Jefferson, Jennings, Lawrence, Martin, Monroe, Montgomery, Orange, Owen, Parke, Perry, Pike, Ripley, Spencer, Sullivan, Vanderburgh, Vigo, Warrick
  • Indiana places: Bloomington, Brookville, Clinton Falls, Dillsboro, Fishers, French Lick, Indianapolis, Lawrenceburg, Lexington, Martinsville, McCormick’s Creek State Park, Nashville, North Vernon, Skiles Test Park, Spencer
  • Kentucky counties: Boone, Breckenridge, Bullitt, Carroll, Daviess, Gallatin, Grayson, Henry, Jefferson, La Rue, McLean, Muhlenberg, Nelson, Ohio, Oldham, Trimble
  • Kentucky places: Big Bone Lick State Park, Covington, Dayton, Dry Ridge, Florence, Ft. Thomas, Georgetown, Hebron, Highland Heights, Louisville, Newport, Villa Hills.
  • Maryland counties: Allegany, Anne Arundel, Baltimore, Carroll, Cecil, Garrett, Harford, Howard, Montgomery, Prince Georges, Washington
  • Maryland places: Abingdon, Annapolis, Aspen Hill, Baltimore, Bel Air, Beltsville, Berwyn Heights, Bethesda, Bowie, Brooklandville, Brooklyn Park, Catonsville, Chevy Chase, Clinton, Colesville, College Park, Columbia, Cockeysville, Crofton, Cumberland, District Heights, Eldersburg, Elkridge, Elkton, Ellicott City, Fair Hill, Fallston, Forestville, Gaithersburg, Gambrills, Germantown, Glen Burnie, Glenelg, Greenbelt, Gwynn Oak, Hagerstown, Hanover, Havre De Grace, Hillcrest Heights, Hunt Valley, Hyattsville, Hydes, Jessup, Landover Hills, Laurel, Lutherville, Odenton, Oella, Owings Mills, Pikesville, Potomac, Randallstown, Reisterstown, Riverdale, Rockville, Severna Park, Sharpsburg, Silver Spring, Takoma Park, Timonium, Towson, Wheaton
  • Michigan counties: Hillsdale, Washtenaw
  • Michigan places: Ann Arbor, Canton, Quincy
  • North Carolina counties: Cherokee, Surry, Wilkes
  • North Carolina places: Morganton, Murphy
  • New Jersey counties: Burlington, Hunterdon, Mercer, Salem
  • New Jersey places: Browns Mills, Harmony, Hillsborough, Holland Township, Kingwood Township, Lawrence, Merrill Creek Reservoir, Milford, Monmouth Junction, Morristown, Mt. Rose, Pennington, Princeton, Sourland Mountain. There’s an abundance of large parks and natural areas around Princeton.
  • New York counties: Suffolk
  • New York places: Stony Brook, LI
  • Ohio counties: Defiance, Franklin, Greene, Hamilton, Logan, Montgomery
  • Ohio places: Anderson Twp, Battelle Darby Park, Bellbrook, Centerville, Cincinnati, Columbus, Defiance, Delaware, Delhi Twp, Dublin, Fairfield, Galloway, Hamilton, Kettering, Lewisburg, Lockland, Miamisburg, Olmsted Falls, Oxford, Springfield, St. Bernard, West Carrollton, West Chester
  • Pennsylvania counties: Adams, Bedford, Berks, Bucks, Chester, Columbia, County, Cumberland, Dauphin, Franklin, Fulton, Huntingdon, Lancaster, Lehigh, Luzerne, Lycoming, Mercer, Montgomery, Northampton, Perry, Schuylkill, Somerset, York
  • Pennsylvania places:Archbald, Artemas, Bedford, Carroll Valley, Coopersburg, Dinosaur Rock, Downingtown, Gettysburg, Green Lane, Kintnersville, Lake Nockamixon, Lancaster, Lititz, Malvern, Mertztown, Mohnton, Mt Gretna, Oaks, Oley, Perkasie, Perkiomenville, Phoenixville, Pittston, Quakertown, Red Lion, Roaring Spring, Solebury, Spring Mount, Stewartstown, Topton, Upper Black Eddy, Warwick Park
  • Tennessee counties: Blount, Greene, Hamblen, Jefferson, Knox, Roane, Sumner, Wilson
  • Tennessee places: Copperhill, Farragut, Fayetteville, Knoxville, Oak Ridge.
  • Virginia counties: Arlington, Clarke, County, Dulles Smithsonian National Aircraft and Space Museum, Fairfax, Fauquier, Frederick, Shenandoah, Warren, Winchester
  • Virginia places: Alexandria, Annandale, Arlington, Ashburn, Centreville, Chantilly, Clearbrook, Del Ray, Doswell, Dunn Loring, Fairfax, Falls Church, Franconia, Hampton Roads, Haymarket, Herndon, Lorton, Lovettsville, Manassas, Merrifield, Oakton, Reston, Springfield, Sterling, Vienna, White Post, Winchester.
  • West Virginia counties: Berkeley, Grant, Hampshire, Hardy, Jefferson, Mineral, Morgan
  • West Virginia places: Martinsburg, New Creek
  • Washington D.C.

More Location Tips:


Why do they stay underground for 17-years? The prevailing research suggests they’ve evolved a long, 17-year lifecycle to avoid predators that can sync up with their lifecycle & emergence. Why are there so many?! Research suggests that their huge numbers allow them to overwhelm predators, so enough of them will live on to breed and perpetuate the brood.

More facts and fun:

1907 Map from Marlatt, C.L.. 1907. The periodical cicada. Washington, D.C.: U.S. Dept. of Agriculture, Bureau of Entomology.

See a modern map, or the Live Map from the Cicada Safari app.
Marlatt 1907 10 Brood X


  1. Sara says:

    @Marry Warren why are they interesting. Um thwy creep me out. They r evereywhere!!! I AM NOT A FAN

  2. Dan says:

    Some Brood X “stragglers” emerged early in 2020. See where on the map below (Green):
    May 30 map - Now with Brood V

  3. Robert Sherman says:

    lordville ny ,delaware cnty, spring 1987, massive infestation,

  4. Angela Wisdom says:

    We are witnessing many Pharaoh cicadas emerging on our property in West Chicago, IL (Dupage County) in the last few days. The casings are plentiful attached to all different kinds of plants in the flower beds. This morning I witnessed adults waiting on different leaf stems. By late morning they had flown into the tree canopy. One we watched from an early stage of shedding, dangling as it turned from light colored to it’s full dark color. Amazing! As I’m reading, I’m thinking this is Brood X emerging a year early? Wow I can’t imagine how many to expect next year if this is just “some” and most will come next year!

  5. Mary Warren says:

    Cicadas are everywhere here in Ivanhoe, VA! Tons of shells clinging to trees, flowers, and scattered on the ground. The ground is covered with holes. I’ve never witnessed this before so it’s really interesting. In eastern NC, we only saw the empty shells (which terrified me) when I was growing up. I am now seeing them actually emerging from the shell and looking like that can’t possibly develop those wings and fly. They are incredible!

  6. John B. says:

    Spotted a shell on the tree, smaller than the regular shells. Sterling Va. Arise My Minions and smite the eardrums of the unworthy!

  7. Jose Quervooo says:

    Periodical cicada spotted this morning in Vienna, VA. Early Brood X riser? Ive not seen any nymph exoskeleton. This was clearly an adult.

    1. Dan says:

      @Jose, yes, that is Brood X territory.

  8. Lisa Dukes says:

    I remember going to outdoor Easter services in Springfield VA in what must have been 1970 when I was 12. You could not hear anything for the noise of the cicadas but I thought it was amazing. When we walked around in our back yard in the Franconia area, we stepped on deep piles of husks. It was a memorable thing.

  9. JDS says:

    My son and I were both born during Brood X peaks, 34 years apart, 1970 and 2004. Him on May 28 and me on May 29. So I have these cicadas indelibly associated with mine and his birthday.

    He will be 17 on the next one, next year! I, on the other hand, will be much, much older.

    Just thought I’d mention it.

    1. Shannon says:

      I’ll always remember when they’ll be back too. I was very pregnant with my middle son the last time they were here. It doesn’t seem like it’s been almost 17yrs though. My son will be 17 next year on June 15th.

  10. James K says:

    Dan, do you believe that 2021 will still be the larger year for this brood in Northern Virginia?

    I still have very fond memories of this brood in 2004 (My Puppy JRT loved it, she even gently carried one around and set it down again before it flew off), and interestingly enough they were my first true cicada encounter as a little kid around here as well!


  11. Suzanne Strickland says:

    I love cicadas and look forward to their arrival. They are a gentle, misunderstood bug and they are short living. I do understand the destruction they cause but they too have a purpose. B some wildlife will have a feast day. Their whimsical sound is short lived. Relish their beauty and gentleness. Be kind

    1. Carol Burke says:

      To live underground for 17 years, then emerge into the light and air to love and die reminds me of a Greek tragedy, a sad fate. I love cicadas too.

  12. Cameron says:

    Hey not sure if you got the other message I sent to you… but I have two questions. Do you think Brood X stragglers will emerge a year early in Princeton NJ? Also, what brood do you think the reports coming from Augusta GA are from? Thanks.

    1. Dan says:

      @Cameron. Some X should emerge in Princeton this year. Probably not as big as 3 years ago. August is X.

      1. Cameron says:

        Thanks Dan! If I see any in Princeton I will report it to cicada safari this year. I hope there will be cause we can’t travel out of state. lol

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