Goldfish spawn when water cools after a period of hot weather. Think about what season it is. Goldfish Spawning Into Homemade Mops Goldfish Homemade Water Garden Youll want your goldfish to be properly adjusted to their habitat and de-stressed before. When do goldfish spawn . Its a fact that goldfish are ready to breed from 1-2 years old but usually they breed best at 3 years. If your goldfish is kept outside it will only spawn during the spring or early summer. Of course a bit earlier or a bit later a bit longer or a bit shorter of a spawning season depending upon where you live. Spring is on its way. Ad Find results for Buy gold online on Finecomb for Singapore. If the weather has been cold a rise in their water temperature will cause them to spawn. Spawning provides a wonderful opportunity to learn more about your goldfish. Goldfish mate when they are around three years old and the water temperature is warm. If your goldfish has always been kept inside it could...