Sailfin mollies are native to the freshwater rivers and streams of Central America and Mexico, and are also found in some brackish water habitats near the coast. They are livebearers and can reproduce quickly in a suitable environment.
In Houston, Texas, the average daily high temperature in the winter months is around 65°F (18°C) and the average daily high temperature in the summer months is around 95°F (35°C), so the water temperature in an outdoor pond will typically be within the ideal range for sailfin mollies.
However, it is important to provide sailfin mollies with an environment that mimics their natural habitat. They prefer slow-moving water with plenty of plants for cover and shade, and they appreciate having access to a variety of food sources, including algae, aquatic insects, and small crustaceans.
If you are able to provide sailfin mollies with these ideal conditions, they can thrive and reproduce successfully in an outdoor pond in Houston, Texas.