Fireflies in Utah: A Guide to Observing Nature’s Light Show

Fireflies, also known as lightning bugs, are soft-bodied beetles. These bioluminescent beetles emit light to communicate to mates and deter predators. While they are commonly associated with the eastern United States, fireflies can also be found during the summer in Utah’s marshes and wetlands!

Viewing Fireflies

• Seasonality: During the summer, May to July.
• Timing: Typically start flashing around dusk or later.
• Conditions: Choose a warm summer night with little to no wind—fireflies are most active when temperatures are mild and the air is calm.
  
• Habitat: Fireflies love wetland habitat and dark areas where they can perch on tall grasses. Try looking at areas with standing water that are far from city lights! 

Observing Fireflies Responsibly

• Minimize Light Pollution: Avoid using flashlights or phone screens. If necessary, use red lights, which are less disruptive.
• Stay on Designated Paths: Stick to trails to help protect wetlands and other habitats!
• Limit Catching: Observe fireflies with your eyes! Please refrain from catching fireflies as it can disturb them.
• Participate in Community Science: Report sightings to the Western Firefly Project to aid in the research and conservation of fireflies.
  

Fireflies on the Swaner Preserve

One of the best publicly accessible places to see fireflies is on the south side of the Preserve along the trail between Cutter Lane and Swaner’s fenceline. This scenic path is open 24/7 and offers a nice spot away from the road, perfect for watching fireflies light up the night! Fireflies on the Preserve are typically most active from mid-June through early-July, with peak viewing between 9:30 and 10:30 PM, just after dark.

Parking

Parking can be tricky near Cutter Lane, so we recommend parking in Kimball Junction and then walking or biking along the trail to reach the best viewing areas.

Other Naturalist News

Loss of Beaver Population Next to Swaner EcoCenter

Between March 23 and April 2, five dead beavers were discovered near the Swaner Preserve & EcoCenter by Swaner staff. All five beavers shared one lodge outside the EcoCenter, and samples collected from one of the beavers tested positive for tularemia.

Swaner Preserve & EcoCenter Welcomes New Executive Director

We are thrilled to announce our new executive director, Lewis Kogan. Learn more about his impressive career and excitement to join the organization.

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