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How fast do the tiny toads grow?

The Question: I work at a farm in northeast Pennsylvania. I read your article about toadlets. I have been enjoying seeing hundreds of these mini toads as I garden. Mine are still only about an inch long. How long does it take for them to reach full size?

Submitted by: Victoria, Pennsylvania, USA

(click on photos and graphics to expand)

The Short Answer: Victoria, glad to hear you are enjoying the toads. There are so many tiny toads all over my yard right now that I worry about inadvertently stepping on them. In northeastern Pennsylvania where you live, there are two toad species, the American toad (Anaxyrus americanus – formerly Bufo americanus) and the very similar Fowler’s toad (Anaxyrus fowleri – formerly Bufo fowleri). The easiest way to tell the two species apart is to flip them over and look at their bellies. If it has dark speckles, it’s probably an American toad and if not, it’s probably a Fowler’s toad.

toad-growth-chartBoth species start out as tiny toadlets, about 1 cm (3/8 inch) long. They grow rapidly in the first year and then slow down dramatically. By their second birthday, they are pretty close to full grown. Males generally begin to breed in their second year, females in their third. This chart is based on data for the American toad from Frogs of the U.S. and Canada by C. Kenneth Dodd. The book lists the size range of adult American toads as 5-9 cm (2-3.5 in.). The largest American toad on record was a whopping 15.5 cm (6.1 in.). Fowler’s toads are somewhat smaller at 4.5-8.2 cm (1.7-3.2 in.), with a record size of 9.2 cm (3.6 in.).

If your toadlets are already about an inch (2.5 cm), then they must have been early hatchers this year that have done very well eating small insects around your garden. Toads are pretty voracious insect eaters. One study estimated that an adult American toad could eat nearly 10,000 insects a year!

Sources: Dodd, C. (2013). Frogs of the United States and Canada. Baltimore: Johns Hopkins University Press.

Cite this article as: Pelletier, TC. (July 22, 2015). How fast do the tiny toads grow? Retrieved from http://askanaturalist.com/tiny-toad-growth/ on August 30, 2016.
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4 Responses

  1. Davi Says:

    hi I was wondering if you know how fast those
    a tiny black Brazilian toad with circles on top grow because im keeping some as pets, and I don’t know if their eating the bugs I gave theme.

  2. Tom of AskaNaturalist.com Says:

    Sorry, I really don’t know. Can you send me a picture of the toads? Send it to tom@askanaturalist.com.

  3. Gregory Brumfield Says:

    (yes) how fast does the tiny toad grow in length. thank you.

  4. Janeen from Michigan Says:

    I saved a bunch of American Toads from my pond filter. They are now toadlets living in a couple nice habitats that we created. We want to keep 2 females. How old do they have to be before we can sex them? I know the difference, but, when can we tell?

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