On warm, rainy nights in the spring when the nighttime temperature is above 40 degrees, amphibians ranging from spotted salamanders to wood frogs migrate from the burrows where they spend the winter to vernal pools where they breed. 

These spring migration events are often referred to as Big Nights.

“One of the primary issues with these Big Night events is that these frogs are often crossing active roads,” which can cause them to be run over by passing cars, Lebanon Conservation Commission member Chris Johnson said.

Chris Johnson, of Lebanon, N.H., picks up a spring peeper to carry it across the road during a Big Night in Lebanon, N.H., on Tuesday, April 14, 2026. Johnson is a member of the Lebanon Conservation Commission and is one of several volunteers who spend wet spring evenings documenting amphibian migration and helping frogs and salamanders cross the road without being run over by cars. ALEX DRIEHAUS / Valley News

Local volunteers, who serve as amphibian crossing guards, ask that drivers be vigilant and reduce their speed on wet spring evenings.

“One of the goals of the Lebanon Conservation Commission has been to raise more awareness that these events are even taking place in the hopes of saving more of our little froggy friends,” Johnson said.

Alex Driehaus is a staff photographer at the Valley News. She can be reached at adriehaus@vnews.com and (603) 727-3304.