The spotted salamander's rainy-night walk to the breeding pool

For one or two nights each spring, according to National Geographic, a quiet animal climbs out of the ground and heads for a shallow pool. The spotted salamander (Ambystoma maculatum) spends more than 95 percent of its life hidden in burrows or under logs and rocks, a Maine land trust writes. Then comes a warm, rainy night, and the forest floor of eastern North America fills with large, dark, yellow-spotted animals all walking in the same direction.

They are headed for vernal pools: shallow woodland ponds that dry up in summer and, because of that, hold no fish. Males arrive first. Females follow. Eggs are laid, the adults go back underground, and most will not be seen again until next spring. One source notes that individual adults do not necessarily make the trip every year.

This article follows that journey: what sets the date, what happens at the pool, how the adults find their way back, and what roads do to the plan. The sources agree on the big picture and differ on details such as temperatures and egg counts. We say where.

Meet the spotted salamander

Adults are large and sturdy for a salamander, dark with two irregular rows of bright spots. The Animal Diversity Web counts 24 to 45 spots, yellow or orange, and calls unspotted animals rare. Size depends on who you ask: the three sources in the table below give three different ranges.

A note on units: Connecticut’s page prints the upper end of its range as 200 mm, but 6.75 inches is about 171 mm, so the table converts the inch figures.

The Animal Diversity Web says adults are most abundant in deciduous bottomland forests along rivers, and that most live within a few centimeters of the surface, though some have been found 1.3 meters down. After breeding, National Geographic says, adults go back underground, sometimes up to two feet below the surface.

The skin secretions listed in the table are a real defense: the Animal Diversity Web describes them as a sticky white toxic liquid. This article is not a guide to handling wild animals, so watch spotted salamanders from a distance.

What sets the date

Spotted salamanders do not use a calendar. They use weather. The Animal Diversity Web says the migration starts at night with the first rain after snowmelt. Other sources fill in the recipe, each for its own place.

No two rows match, and that is the lesson: the trigger is the weather, not the date. The Animal Diversity Web notes that egg-laying runs from late December in the south to early May in Nova Scotia. Porter, who has tracked the migration behind his house for about 20 years, looks for the conditions in the table. These are local rules of thumb, not laws of nature.

Why both warmth and wet? National Geographic explains that salamanders are exotherms, so cold slows them down, and that they need moisture to breed.

At the pool: males first

The Animal Diversity Web says males arrive first, move faster and stay longer than females. The Maine land trust says females follow a few days later, and Connecticut says they come on a later rainy night. National Geographic describes the Big Night as lasting only one or two nights each spring. The sources do not reconcile those two pictures, and timing surely varies with weather and place.

Courtship is crowded. Shaver’s Creek Environmental Center describes males swirling in a group around a female, nudging and rubbing against her. Males leave spermatophores (small packets of sperm) on leaves and twigs on the pool bottom, and the Animal Diversity Web says up to 80 per male. A female may draw them into her body, so fertilization is internal.

She then attaches her eggs to submerged sticks or plants. The jelly coating swells in water into a fist-sized mass, Connecticut says. Shaver’s Creek says a female lays up to three masses, which may take on a green tint from algae. A 2017 eLife study found that the green alga Oophila amblystomatis enters the cells of developing embryos, and its authors suggest the arrangement is neutral or beneficial for the salamander.

Eggs hatch in about 30 days (Connecticut) or four to seven weeks (Animal Diversity Web). Larvae transform within two to four months and leave the water in late summer or early fall. Fishless pools are the point: because pools dry up, National Geographic says, fish cannot reach the eggs and larvae. They are not safe from everything. The Animal Diversity Web lists newts, crayfish, certain insects and even Wood frog tadpoles as egg predators, and says up to 90 percent of eggs may be killed in some years.

Going home

The Animal Diversity Web says adults try to return to the pond where they hatched, even if another is closer, and can find it after being moved hundreds of meters away. The Maine land trust and National Geographic say much the same about birth pools. The sources do not explain how they find it.

How far do they roam between visits? The Animal Diversity Web says most adults stay within about 100 meters of their pond, with a few found as far as 250 meters. National Geographic gives no distance. Treat the number as one report, not a rule. Connecticut adds that after breeding, adults go to summer feeding grounds and underground homes, and are seldom seen outside early spring.

The same database says survivors typically live about 20 years in the wild, with 30 as a reported maximum. That is one source, but it fits a story in which a salamander makes the walk many times, though perhaps not every year.

What happens when a road is in the way

Connecticut’s wildlife agency says many spotted salamanders are killed by vehicles while crossing roads on migration nights. The land trust says Big Night is when the animals are most vulnerable, with many killed by vehicles. National Geographic says salamanders are no match for a truck tire and can struggle to climb a railroad tie. It reports that road salt delays hatching and reduces survival, that researchers take volunteers out on rainy nights to help animals cross, and that residents and conservationists in Amherst, Massachusetts, built two tunnels under a busy road. This article is not a guide to handling wild animals.

Common mistakes and myths

Myth: spotted salamanders live in ponds. Adults spend more than 95 percent of their lives in burrows or under cover, per the Maine land trust. The pond is a nursery and a meeting place.

Mix-up: every adult goes every year, all on one night. The land trust says individuals do not necessarily migrate every year, and the sources describe males arriving before females.

Mistake: the nearest pond is the one they pick. The Animal Diversity Web says adults try to return to their birth pond even if another is closer.

Mix-up: it is a frog, newt or lizard. Shaver’s Creek calls it a mole salamander, a group that spends much of its time underground. Its relative the Axolotl is also in the genus Ambystoma. The forest-floor Red-backed salamander skips the pond altogether.

Conservation status

The spotted salamander is listed as Least Concern on the IUCN Red List of Threatened Species. That is the category as distributed by GBIF, the Global Biodiversity Information Facility, and we checked it on November 9, 2026. Least Concern means the species was evaluated and does not meet the criteria for a threatened or near-threatened category.

That does not mean it is free of trouble. Connecticut names the loss of vernal pools and surrounding upland forest as a major concern, says low pH and acid rain can kill eggs, and says the species declines in urbanized, fragmented areas. The Animal Diversity Web agrees on acid precipitation and vernal-pool loss and says the species is not listed under the US Endangered Species Act or CITES. Road deaths add to the pressure. The only trend our sources state is Connecticut’s: its population appears to be in long-term decline. We have no confirmed rangewide trend.

Categories are reviewed and can change, and the copy GBIF distributes can trail the IUCN website by some months, which is why we print the date we checked. GBIF’s copy does not give the year of the IUCN assessment, so we do not state one.