THE EARNEST TRAVELER
For a week or two each spring, one of the few firefly species in the Western Hemisphere that flashes in unison lights up the forest at Elkmont — and the only way in during the event is a lottery.
What You're Seeing
The species is Photinus carolinus, known for synchronous flashing — waves of light that ripple through the dark forest in near-perfect time. The display peaks for a short window each year as the fireflies mate, which is why the park limits access during the event.
The 2026 Dates & Lottery
The 2026 viewing event runs May 20–27. Access is by lottery on Recreation.gov: applications open at 10 a.m. April 24 and close 11:59 p.m. April 27, with a $1 application fee. If you're drawn, a parking pass costs $29 and admits one vehicle with up to seven people; there are 120 reservations a night, 960 for the event. Applicants are notified by email by May 6.
If You Get a Spot
Passes are non-refundable, non-transferable, and valid only for the date issued. Bring a flashlight covered with red cellophane — white light disrupts the display and your night vision — a chair, and warm layers; the forest is cool after dark. Follow the shuttle and ranger instructions exactly.
Synchronous fireflies also appear elsewhere in the southern Appalachians on similar timing. If you miss the Elkmont draw, ask the park and nearby forests about other viewing areas that don't require the lottery.
Enter the lottery on Recreation.gov and pair it with a nearby campground.