When do frogs spawn? And how to spot them

The lifecycle of a frog is one of nature’s wonders. It all starts with clusters of jelly containing thousands of embryos. Find out when frogs spawn and the best time to spot these fascinating jellified clumps in ponds near you.

When do frogs spawn?

In the UK, frogspawn appears in ponds from January onwards, depending on the weather and the region, with the South West usually seeing the first sightings. By March, you should be able to spot frogspawn in ponds across the country.

How do frogs breed?

Frogs can breed from between two and three years old. They often return to the pond where they were spawned. Males attract females by croaking and breeding involves the male attaching himself to the back of the female by grasping her under the forelegs, where he stays until she lays her eggs. As the females lay spawn, the males fertilise it by spraying sperm over them. It is possible for more than one male to fertilise a female’s spawn.

Where do frogs lay their spawn?

Females lay their spawn in well-vegetated, shaded, shallow ponds. As the eggs mature, the clusters of spawn swell and float to the water’s surface. There may be so many clusters in a pond that they merge to look like one jelly mat. Frogspawn is therefore difficult to miss!

There’s no such thing as too much frogspawn, so don’t worry if your pond is full of it! In fact, the more the better – only around 1 in 50 eggs laid will survive to make it out of the pond as a froglet, and as few as 1% of those will make it to adulthood. This is because they are vulnerable to a host of predators at different life stages.

If you don’t have a garden pond, why not head out to your local park, nature reserve or wood and keep your eyes peeled for ponds that may have frogspawn?

What does frogspawn look like?

Frogspawn appears as clusters of black dots surrounded by a clear, jelly-like casing. Each dot is a developing embryo that may soon hatch into a tadpole. A single clump can contain up to 2,000 eggs.

How long does it take for frogspawn to hatch?

Frogspawn typically takes around three weeks to hatch, with tadpoles usually emerging and becoming visible in March. Tadpoles are aquatic and use their gills to breathe underwater as they forage and feed. 

What do tadpoles eat?

When they first emerge, tadpoles feed on the yolk of their egg. After a few days, they begin eating algae. As they grow, their diet expands to include leaves, moss and sometimes even small insects. 

How long does it take for a tadpole to become a frog?

It takes around 14 weeks for a tadpole to transform into a frog in a process called metamorphosis. Tadpoles first develop their legs, followed by their arms. Gradually, their tail is absorbed into the body, skin grows over their gills and their lungs develop, allowing them to breathe above water. 

But this timeline isn't fixed. Tadpoles can speed up their transformation in dangerous environments. However, if their pond has plenty of food, few predators or if the surrounding land is cold, they can delay development by months. 

UK frogs and threats

The UK has two native species of frog, the common frog (Rana temporaria) and the pool frog (Pelophylax lessonae). The pool frog is extremely rare, with only a small reintroduced population in Norfolk. The frogspawn you’re most likely to see is that of the common frog. In spite of its name, the common frog is not necessarily common – in many areas of the countryside they have completely disappeared due to agricultural pesticides, draining of wetland habitats and filling-in of small ponds.

Top tips for pond owners

Garden ponds are extremely important for common frogs, particularly in urban areas. Here are some tips to maximise your chances of frogspawn this spring:

• Ensure that your pond is partially shaded and filled with appropriate pond plants, such as duckweed, water lilies, marsh marigolds and water violets, to create the perfect breeding ground for frogs.
• The area around the pond should be a well-planted habitat to attract breeding frogs.
• Although frogs require shelter from heat, too many overhanging trees can be detrimental as ponds need periods of direct sunlight to thrive.
• Shallow edges allow frogs to get in and out of ponds with ease.
• A depth of two to three feet (61–91cm) is recommended.
• Don’t move frogspawn or tadpoles into a different pond. It may not have the right conditions for them to survive and there is the risk of spreading disease.

Record frogspawn on Nature’s Calendar

The Nature’s Calendar project tracks the effects of weather and climate change on wildlife across the UK – its records date all the way back to 1736! Frogspawn is just one of 69 wildlife events recorded for the project.

Join Nature’s Calendar to record your sightings – every record is crucial and valid. The data recorded helps us to better understand the effects of climate change and other patterns in the natural environment. By taking just a few minutes to share what you see, you'll be adding to hundreds of years' worth of important data for studies worldwide. We couldn't do this work without you! Why not give it a go yourself?

This blog was originally published on 14 February 2019, and was last updated on 14 April 2026, to include new information.